Sarcopenic obesity in older adults: aetiology, epidemiology and treatment strategies

In the paper

“an association that was not observed with cardiovascular disease221”

What the sources say

• Disputed

  The Discussion (WC and MAMC Measurements; page unavailable) says sarcopenic obesity defined using grip strength predicted greater risk of CVD events—the opposite of the claimed lack of association. This paper's own null finding concerned obesity and low muscle mass defined using waist and midarm measurements, not BMI and handgrip strength (Methods, Anthropometric Measurements and Sarcopenic Obesity Definition; page unavailable). (LLM, conf=0.88)

  Checked by a reasoning model — may be wrong.

  cites [221] Atkins, J. L. et al. Sarcopenic obesity and risk of cardiovascular disease and mortality: a population-based cohort study of older men. J. Am. Geriatr. Soc. 62, 253–260 (2014). sourceExperimental — accuracy not yet measured

In the paper

“Aerobic exercise and resistance training are safe, even in patients who are at a high risk of falling275.”

What the sources say

• Disputed

  The Results (page not specified) report significantly more musculoskeletal injuries with resistance training than with control (18 versus 5), contrary to the unqualified claim that it is safe. The review reports no trials of endurance training alone, so it also does not establish the safety of aerobic exercise, including for people at high risk of falling. (LLM, conf=0.88)

  Checked by a reasoning model — may be wrong.

  cites [275] Gillespie, L. D. et al. Interventions for preventing falls in older people living in the community. Cochrane Database Syst. Rev. 9, CD007146 (2012). sourceExperimental — accuracy not yet measured

In the paper

“However, reductions in TNF and IL-6 observed in older men with hypogonadism can be reversed following testosterone treatment406.”

What the sources say

• Disputed

  The Discussion says acute hypogonadism in elderly men increased circulating TNF and IL-6, rather than reducing them; subsequent testosterone treatment reduced TNF but not IL-6. The Results report that testosterone treatment suppressed spontaneous ex vivo production of both cytokines in the paper’s older diabetic men, not that it reversed reductions in them. Page numbers are unavailable in our copy. (LLM, conf=0.88)

  Checked by a reasoning model — may be wrong.

  cites [406] Corrales, J. J. et al. Androgen-replacement therapy depresses the ex vivo production of inflammatory cytokines by circulating antigen-presenting cells in aging type-2 diabetic men with partial androgen deficiency. J. Endocrinol. 189, 595–604 (2006). sourceExperimental — accuracy not yet measured

In the paper

“Individuals with sarcopenia have elevated levels of myostatin443, a negative regulator of skeletal muscle growth development444.”

What the sources say

• Disputed

  The citation is attached to the claim that people with sarcopenia have elevated myostatin. The Discussion reports no meaningful difference in myostatin concentrations between older subjects with and without sarcopenia in either sex. The Results also report that sarcopenic older women had absolute levels comparable to younger women, while sarcopenic older men had lower levels than younger men. The separate citation for myostatin’s regulatory role is not assessed here. (LLM, conf=0.89)

  Checked by a reasoning model — may be wrong.

  cites [443] Bergen, H. R. III et al. Myostatin as a mediator of sarcopenia versus homeostatic regulator of muscle mass: insights using a new mass spectrometry-based assay. Skelet. Muscle 5, 21 (2015). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [444] McPherron, A. C., Lawler, A. M. & Lee, S. J. Regulation of skeletal muscle mass in mice by a new TGF-beta superfamily member. Nature 387, 83–90 (1997). source

In the paper

“A number of mechanisms might explain the reduction of muscle mass and strength in sarcopenic obesity, including type II muscle fibre atrophy, reduction in motor neurons, collagen deposition and fibre necrosis67–70.”

What the sources say

• ?Not checked — no full text of the sourcecites [67] Thomas, D. R. Loss of skeletal muscle mass in aging: examining the relationship of starvation, sarcopenia and cachexia. Clin. Nutr. 26, 389–399 (2007). source
• ?Not checked — no full text of the sourcecites [68] Nilwik, R. et al. The decline in skeletal muscle mass with aging is mainly attributed to a reduction in type II muscle fiber size. Exp. Gerontol. 48, 492–498 (2013). source
• Partly supported

  The Introduction links age-related muscle-mass loss to fibre atrophy, and ‘Neural influences on aging skeletal muscle’ describes motor-unit loss and denervation of fast fibres. The Conclusions also discuss possible motor-neurone loss and reduced muscle force. These passages concern aging muscle, not specifically sarcopenic obesity; they do not establish type II fibre atrophy, collagen deposition, or fibre necrosis. Page numbers are unavailable in our copy. (LLM, conf=0.88)

  cites [69] Delbono, O. Neural control of aging skeletal muscle. Aging Cell 2, 21–29 (2003). sourceExperimental — accuracy not yet measured
• Partly supported

  In “Searching for a definition based on pathophysiology and associated risk” (page unavailable), the paper identifies reduced fibre size and number, increased collagen, and motor-unit changes as contributors to declining muscle quality. “Age-related changes in body composition” (page unavailable) also names loss of alpha-motor units. It does not specify type II fibre atrophy or identify fibre necrosis as a mechanism. (LLM, conf=0.88)

  cites [70] Stenholm, S. et al. Sarcopenic obesity: definition, cause and consequences. Curr. Opin. Clin. Nutr. Metab. Care 11, 693–700 (2008). sourceExperimental — accuracy not yet measured

In the paper

“Muscle injury activates satellite cells to regenerate muscle by releasing IGF1, fibroblast growth factor and mechano growth factor, all of which stimulate the differentiation and proliferation of muscle satellite cells112,113.”

What the sources say

• Partly supported

  The Satellite cell heterogeneity section (page unavailable) says muscle injury activates satellite cells to proliferate and differentiate during regeneration. It does not say injury releases IGF1, fibroblast growth factor, or mechano growth factor to stimulate those cells; its discussion of FGF concerns embryonic progenitors instead. (LLM, conf=0.88)

  cites [112] Kang, J. S. & Krauss, R. S. Muscle stem cells in developmental and regenerative myogenesis. Curr. Opin. Clin. Nutr. Metab. Care 13, 243–248 (2010). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [113] Thornell, L. E. Sarcopenic obesity: satellite cells in the aging muscle. Curr. Opin. Clin. Nutr. Metab. Care 14, 22–27 (2011). source

In the paper

“In sum, individuals with obesity are at risk of inflammation, which can lead to the preferential mobilization of muscle instead of fat91.”

What the sources say

• Partly supported

  The Introduction (page not specified) says inflammation occurs in obesity and may accelerate muscle protein degradation. It does not say that inflammation causes muscle to be mobilized preferentially over fat; that comparison is unsupported. (LLM, conf=0.85)

  cites [91] Srikanthan, P., Hevener, A. L. & Karlamangla, A. S. Sarcopenia exacerbates obesity-associated insulin resistance and dysglycemia: findings from the National Health and Nutrition Examination Survey III. PLoS ONE 5, e10805 (2010). sourceExperimental — accuracy not yet measured

In the paper

“Older adults (those ≥65 years) are at risk of developing anabolic resistance owing to reduced post-prandial amino acid availability, reduced muscle perfusion and a reduced digestive capacity resulting from splanchnic sequestration of amino acids71.”

What the sources say

• Partly supported

  The “Benefits of Higher Protein Intake for Older Adults” section (page unavailable) describes an impaired muscle anabolic response to meals in older adults and calls this anabolic resistance. It does not establish the claimed combination of reduced postprandial amino acid availability and reduced muscle perfusion as its causes. The “Protein DigestibilityeCorrected Amino Acid Score” section (page unavailable) says age-related gastrointestinal changes do not substantially impair amino acid availability from food, contrary to the claimed reduction in digestive capacity. (LLM, conf=0.88)

  cites [71] Bauer, J. et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J. Am. Med. Dir. Assoc. 14, 542–559 (2013). This is a position paper from the PROT-Age study group that recommends an average daily intake of at least 1.0–1.2 g protein per kg body weight per day. sourceExperimental — accuracy not yet measured

In the paper

“Aerobic exercise101, resistance training102–104 and their combination105 increase muscle protein synthesis in older adults despite age-related decreases in anabolic signalling106–109.”

What the sources say

• ?Not checked — no full text of the sourcecites [101] Short, K. R., Vittone, J. L., Bigelow, M. L., Proctor, D. N. & Nair, K. S. Age and aerobic exercise training effects on whole body and muscle protein metabolism. Am. J. Physiol. Endocrinol. Metab. 286, E92–E101 (2004). source
• ?Not checked — no full text of the sourcecites [102] Yarasheski, K. E., Zachwieja, J. J. & Bier, D. M. Acute effects of resistance exercise on muscle protein synthesis rate in young and elderly men and women. Am. J. Physiol. 265, E210–E214 (1993). source
• ?Not checked — no full text of the sourcecites [103] Yarasheski, K. E. et al. Resistance exercise training increases mixed muscle protein synthesis rate in frail women and men >/=76 yr old. Am. J. Physiol. 277, E118–E125 (1999). source
• ?Not checked — no full text of the sourcecites [104] Hasten, D. L., Pak-Loduca, J., Obert, K. A. & Yarasheski, K. E. Resistance exercise acutely increases MHC and mixed muscle protein synthesis rates in 78–84 and 23–32 yr olds. Am. J. Physiol. Endocrinol. Metab. 278, E620–E626 (2000). source
• Supported

  Citation 105 is attached to the claim about combining aerobic and resistance exercise, not to the separate claims about each exercise type or age-related signalling. The Introduction describes a programme including strength and endurance exercise in frail, obese older adults; the Discussion reports that muscle protein synthesis was about 50% higher after training. (LLM, conf=0.93)

  cites [105] Villareal, D. T., Smith, G. I., Sinacore, D. R., Shah, K. & Mittendorfer, B. Regular multicomponent exercise increases physical fitness and muscle protein anabolism in frail, obese, older adults. Obesity (Silver Spring) 19, 312–318 (2011). This study demonstrates that a multicomponent exercise programme consisting of strength, endurance, flexibility and balance increases the basal rate of muscle protein synthesis without affecting the magnitude of the muscle protein anabolic response to feeding. source

In the paper

“Further, whether the bioelectrical impedance prediction equations are valid when applied to different ethnic groups is unclear170, despite specific adaptations and adjustments171–173.”

What the sources say

• ?Not checked — no full text of the sourcecites [170] Chumlea, W. C. et al. Body composition estimates from NHANES III bioelectrical impedance data. Int. J. Obes. Relat. Metab. Disord. 26, 1596–1609 (2002). This study presents normative bioelectrical impedance analysis equations validated using a population-based cohort of American adults. source
• ?Not checked — no full text of the sourcecites [171] Janssen, I., Heymsfield, S. B., Baumgartner, R. N. & Ross, R. Estimation of skeletal muscle mass by bioelectrical impedance analysis. J. Appl. Physiol. (1985) 89, 465–471 (2000). source
• ?Not checked — no full text of the sourcecites [172] Mally, K., Trentmann, J., Heller, M. & Dittmar, M. Reliability and accuracy of segmental bioelectrical impedance analysis for assessing muscle and fat mass in older Europeans: a comparison with dual-energy X-ray absorptiometry. Eur. J. Appl. Physiol. (1985) 111, 1879–1887 (2011). source
• Supported

  The Discussion (§4) reports that equations developed in Caucasian cohorts outperformed equations developed in other cohorts when tested in predominantly Caucasian Australians. The Conclusions (§5) call for validation in other ethnic groups, supporting the claim that validity across ethnic groups remains unclear. The separate clause about adaptations is cited to other sources, not this paper. (LLM, conf=0.93)

  cites [173] Yu, S. C., Powell, A., Khow, K. S. & Visvanathan, R. The performance of five bioelectrical impedance analysis prediction equations against dual x-ray absorptiometry in estimating appendicular skeletal muscle mass in an adult Australian population. Nutrients 8, 189 (2016). source

In the paper

“Muscle fascicle length and muscle tendon stiffness reportedly increased after strength training (leg press and extension) over 14 weeks in a cohort of men and women aged over 65 years140.”

What the sources say

• Partly supported

  The Abstract and Results report increased patella tendon stiffness after 14 weeks of leg press and leg extension training; Methods identifies the training group as five women and four men, with a mean age of 74.3 years. The paper does not report an increase in muscle fascicle length: its Discussion mentions fascicle length in connection with another study, not as a measured outcome here. (LLM, conf=0.89)

  cites [140] Reeves, N. D., Maganaris, C. N. & Narici, M. V. Effect of strength training on human patella tendon mechanical properties of older individuals. J. Physiol. 548, 971–981 (2003). sourceExperimental — accuracy not yet measured

In the paper

“In a pre-frail and frail population, a strategy combining physical training and nutritional intervention was more likely to result in stable or reduced IL-6 levels in individuals who demonstrated improved physical performance than in those with lower physical performance149.”

What the sources say

• Partly supported

  The Abstract and Results (Table 4; page not available) report that prefrail and frail participants whose physical performance improved were more likely to have stable or reduced IL-6 than participants whose performance did not improve. The comparison was based on improvement over time, not on having higher versus lower physical performance levels. (LLM, conf=0.84)

  cites [149] Haider, S. et al. Change in inflammatory parameters in prefrail and frail persons obtaining physical training and nutritional support provided by lay volunteers: a randomized controlled trial. PLoS ONE 12, e0185879 (2017). sourceExperimental — accuracy not yet measured

In the paper

“Variable hydration status also impacts its accuracy167.”

What the sources say

• Supported

  The Introduction says BIA assumes constant hydration and that this assumption is violated as adiposity changes the ratio of extracellular to intracellular water. The Discussion also links changes in regional water distribution with departures from BIA's assumptions that can increase measurement error. These passages support the general claim that variation in hydration affects accuracy. (LLM, conf=0.86)

  cites [167] Bosy-Westphal, A. et al. Quantification of whole-body and segmental skeletal muscle mass using phase-sensitive 8-electrode medical bioelectrical impedance devices. Eur. J. Clin. Nutr. 71, 1061–1067 (2017). source

In the paper

“Muscle protein synthesis is also improved by nutrient-stimulated vasodilation and nutrient transport to local muscle myofibrils112,124.”

What the sources say

• ?Could not verify

  The Introduction and Conclusion describe muscle stem cells, development, and regeneration. A passage in “Satellite cell heterogeneity” discusses signaling between nearby cells and satellite cells, but not nutrient-stimulated vasodilation, nutrient transport to myofibrils, or muscle protein synthesis. Searches for those terms found no passage addressing the claimed mechanism; page numbers were not available in our copy. (LLM, conf=0.76)

  cites [112] Kang, J. S. & Krauss, R. S. Muscle stem cells in developmental and regenerative myogenesis. Curr. Opin. Clin. Nutr. Metab. Care 13, 243–248 (2010). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [124] Marzetti, E. et al. Physical activity and exercise as countermeasures to physical frailty and sarcopenia. Aging Clin. Exp. Res. 29, 35–42 (2017). This study provides an overview of the interplay between physical activity, exercise and sarcopenia. source

In the paper

“With ageing, fat preferentially accumulates both viscerally and ectopically rather than as abdominal subcutaneous fat.”

What the sources say

• Partly supported

  The 'Changes in body weight and body composition with aging' section says intraabdominal fat increases more, in relative terms, than subcutaneous fat. It also reports increases in intramuscular and intrahepatic fat, but does not say those ectopic depots increase preferentially over abdominal subcutaneous fat; the 'Definition of obesity' section says abdominal subcutaneous fat also increases with aging. Page numbers were not available in our copy. (LLM, conf=0.86)

  cites [186] Villareal, D. T. et al. Obesity in older adults: technical review and position statement of the American Society for Nutrition and NAASO, The Obesity Society. Am. J. Clin. Nutr. 82, 923–934 (2005). This study highlights current guidelines for the management of older adults with obesity. sourceExperimental — accuracy not yet measured

In the paper

“instrumental activity of daily living disability (OR 1.36, 95% CI 1.05–1.76)”

What the sources say

• Supported

  The Abstract reports that, in fully adjusted analysis of community-dwelling men aged 70 or older, sarcopenic obesity was associated with IADL disability (OR 1.36, 95% CI 1.05–1.76). It specifies FNIH cut-points for low muscle mass and defines obesity as more than 30% body fat. (LLM, conf=0.95)

  cites [204] Hirani, V. et al. Longitudinal associations between body composition, sarcopenic obesity and outcomes of frailty, disability, institutionalisation and mortality in community-dwelling older men: The Concord Health and Ageing in Men Project. Age Ageing 46, 413–420 (2017). source

In the paper

“Rapid accumulation of intra-abdominal fat is exacerbated by physical inactivity, hormonal changes, reduced responsiveness to thyroid hormone and leptin resistance186.”

What the sources say

• Partly supported

  The Pathogenesis section links declining physical activity and age-related hormonal changes, including reduced thyroid-hormone responsiveness and leptin resistance, to increasing body fat. The Changes in Body Weight and Body Composition with Aging section reports a greater relative increase in intra-abdominal fat. The paper does not specifically establish that each listed factor worsens intra-abdominal fat accumulation, and it describes the overall increase in body fat as gradual, not rapid. (LLM, conf=0.86)

  cites [186] Villareal, D. T. et al. Obesity in older adults: technical review and position statement of the American Society for Nutrition and NAASO, The Obesity Society. Am. J. Clin. Nutr. 82, 923–934 (2005). This study highlights current guidelines for the management of older adults with obesity. sourceExperimental — accuracy not yet measured

In the paper

“data from the UK Biobank study found an association between high BMI, low grip strength and reduced long-term physical activity211”

What the sources say

• Supported

  The Conclusion reports that baseline BMI and grip strength independently predicted physical activity after a median 5.7-year follow-up in the UK Biobank cohort. The Discussion says more obese participants had lower activity and less strong participants generally had lower activity, though the grip-strength association was less consistent in men with lower BMI. (LLM, conf=0.93)

  cites [211] Kim, Y. et al. Adiposity and grip strength as long-term predictors of objectively measured physical activity in 93 015 adults: the UK Biobank study. Int. J. Obes. (Lond.) 41, 1361–1368 (2017). This study analyses data from the UK Biobank study and shows that advanced obesity and poor strength at baseline independently predict lower activities at follow-up. source

In the paper

“In another study, the authors identified individuals with a BMI ≥35 kg/m2 and evaluated the prevalence of sarcopenic obesity using DXA-defined body fat in 120 predominantly female adults (46.9 ± 11.0 years). The investigators reported rates that ranged from 0–84.5% in women to 0–100% in males depending upon the definition applied197.”

What the sources say

• Partly supported

  The Results report 120 participants (85.8% female) and sarcopenic-obesity prevalence of 0–84.5% in females and 0–100% in males across definitions. However, the reported mean age is 46.9 ± 11.1 years, not ± 11.0. The Results also describe the cohort’s obesity as BMI-defined; the Methods say DXA supplied body-composition measures, not that body fat defined obesity for every prevalence estimate. (LLM, conf=0.88)

  cites [197] Johnson Stoklossa, C. A. et al. Prevalence of sarcopenic obesity in adults with class II/III obesity using different diagnostic criteria. J. Nutr. Metab. 2017, 7307618 (2017). sourceExperimental — accuracy not yet measured

In the paper

“activity of daily living disability (OR 1.58, 95% CI 1.12–2.24)”

What the sources say

• Supported

  The Abstract (page not provided) defines low muscle mass using FNIH cut-points and obesity as more than 30% body fat. It reports that, in fully adjusted analysis, men with sarcopenic obesity had increased odds of ADL disability (OR 1.58, 95% CI 1.12–2.24). (LLM, conf=0.95)

  cites [204] Hirani, V. et al. Longitudinal associations between body composition, sarcopenic obesity and outcomes of frailty, disability, institutionalisation and mortality in community-dwelling older men: The Concord Health and Ageing in Men Project. Age Ageing 46, 413–420 (2017). source

In the paper

“High BMI and low muscle strength were related to limitation in mobility at 2-year follow-up (OR 3.88, 95% CI 1.08–13.91)212.”

What the sources say

• Supported

  The Results (Table 4) report that participants with obesity and low hand-grip strength had higher odds of mobility limitation at two-year follow-up than those with normal weight and high hand-grip strength (adjusted OR 3.88, 95% CI 1.08–13.91). The study population was community-dwelling older Japanese women. (LLM, conf=0.94)

  cites [212] Jung, S. et al. Obesity and muscle weakness as risk factors for mobility limitation in community-dwelling older Japanese women: a two-year follow-up investigation. J. Nutr. Health Aging 20, 28–34 (2016). source

In the paper

“a combination of obesity, as defined by percentage of body fat, with low muscle mass represented odds ratios of difficulty ascending and descending stairs that were 2.60 and 2.35 higher, respectively”

What the sources say

• Supported

  The Results (pp. 1–3) report that, compared with women with a healthy body composition, sarcopenic-obese women had 2.60 higher odds of difficulty climbing stairs and 2.35 higher odds of difficulty going down stairs. The Abstract defines obesity by percentage body fat and identifies the group as women with both obesity and low muscle mass. (LLM, conf=0.94)

  cites [203] Rolland, Y. et al. Difficulties with physical function associated with obesity, sarcopenia, and sarcopenic-obesity in community-dwelling elderly women: the EPIDOS (EPIDemiologie de l’OSteoporose) Study. Am. J. Clin. Nutr. 89, 1895–1900 (2009). source

In the paper

“Body fat has better predictive validity on the development of the metabolic syndrome192 and cardiovascular disease risk193 than BMI.”

What the sources say

• Partly supported

  The Discussion reports that visceral adipose tissue (VAT), but not subcutaneous adipose tissue, provided information about cardiometabolic risk factors beyond BMI. This supports a narrower comparison than the claim: the study assessed associations cross-sectionally, not whether body fat generally predicts future cardiovascular disease better than BMI. The Conclusions call for prospective studies of MetS and CVD incidence. (LLM, conf=0.86)

  cites [192] Fox, C. S. et al. Abdominal visceral and subcutaneous adipose tissue compartments: association with metabolic risk factors in the Framingham Heart Study. Circulation 116, 39–48 (2007). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [193] Despres, J. P. Body fat distribution and risk of cardiovascular disease: an update. Circulation 126, 1301–1313 (2012). source

In the paper

“Ethnic-specific differences result in inaccurate prevalence estimates184.”

What the sources say

• Partly supported

  The Discussion > Prevalence passage says ethnicity may affect prevalence estimates, especially when the reference and study populations do not match. It does not establish that ethnic differences necessarily result in inaccurate estimates; the citing sentence states that possibility as a definite outcome. Page information is unavailable in our copy. (LLM, conf=0.86)

  cites [184] Cruz-Jentoft, A. J. et al. Prevalence of and interventions for sarcopenia in ageing adults: a systematic review. Report of the International Sarcopenia Initiative (EWGSOP and IWGS). Age Ageing 43, 748–759 (2014). sourceExperimental — accuracy not yet measured

In the paper

“sarcopenic obesity resulted in an increased risk of frailty (OR 2.00, 95% CI 1.42–2.82)”

What the sources say

• Supported

  The Abstract reports that, in fully adjusted analyses of older men, sarcopenic obesity was associated with frailty (OR 2.00, 95% CI 1.42–2.82). It defines low muscle mass using FNIH cut-points and obesity as greater than 30% body fat. (LLM, conf=0.94)

  cites [204] Hirani, V. et al. Longitudinal associations between body composition, sarcopenic obesity and outcomes of frailty, disability, institutionalisation and mortality in community-dwelling older men: The Concord Health and Ageing in Men Project. Age Ageing 46, 413–420 (2017). source

In the paper

“mobility disability trajectories and gait speed over 6 years were steepest in individuals with obesity as defined by BMI and low muscle strength200”

What the sources say

• Partly supported

  The Results (Change over time in walking speed) report the most prominent six-year decline in walking speed among participants aged 65–80 with obesity and low muscle strength. The Results (Risk of mobility disability) report a higher rate of new disability at six years, but do not describe disability trajectories as steepest; the walking-speed finding is also qualified by age. (LLM, conf=0.85)

  cites [200] Stenholm, S. et al. The effect of obesity combined with low muscle strength on decline in mobility in older persons: results from the InCHIANTI study. Int. J. Obes. (Lond.) 33, 635–644 (2009). This study details data from the InCHIANTI study that prove that obesity combined with low muscle strength increases the risk of mobility disability with age. sourceExperimental — accuracy not yet measured

In the paper

“Data from the InCHIANTI study noted rates of 3.2–8.7% using the low knee extensor strength with either high BMI or waist circumferrence200.”

What the sources say

• Partly supported

  The Methods (Measurement of muscle strength; page not provided) define low strength using knee extensor strength, and the Results (Risk of mobility disability; page not provided) describe analyses using BMI or waist circumference to define obesity. The passages in our copy do not report the claimed 3.2–8.7% rates, so the numerical range is unsupported. (LLM, conf=0.84)

  cites [200] Stenholm, S. et al. The effect of obesity combined with low muscle strength on decline in mobility in older persons: results from the InCHIANTI study. Int. J. Obes. (Lond.) 33, 635–644 (2009). This study details data from the InCHIANTI study that prove that obesity combined with low muscle strength increases the risk of mobility disability with age. sourceExperimental — accuracy not yet measured

In the paper

“In a population-based cohort using National Health and Nutrition Examination Survey (NHANES) data that applied the aforementioned FNIH criteria for appendicular lean mass, rates of sarcopenic obesity were 12.6% in men and 33.5% in women.”

What the sources say

• Supported

  The Methods describe an NHANES 1999–2004 sample of adults aged 60 and older and define low lean mass using FNIH appendicular lean mass cutoffs. Results Table 3 reports weighted prevalence of low lean mass with obesity, defined using body-fat cutoffs, as 12.6% in men and 33.5% in women. (LLM, conf=0.95)

  cites [198] Batsis, J. A., Mackenzie, T. A., Emeny, R. T., Lopez-Jimenez, F. & Bartels, S. J. Low lean mass with and without obesity, and mortality: results from the 1999–2004 National Health and Nutrition Examination Survey. J. Gerontol. A Biol. Sci. Med. Sci. 72, 1445–1451 (2017). This report details the definition of low lean mass determined by the Foundation of the National Institutes of Health, as well as the adverse association between low lean mass and mortality. source

In the paper

“a combination of low knee extensor strength with high BMI was associated with reduced gait speed and reduced Late-Life Function and Disability Index and Short Form-12 scores207”

What the sources say

• Partly supported

  The Results report lower gait speed, LLFDI limitations-subscale scores, and SF-12 physical-component scores in the dynapenic obesity group compared with those with neither condition. The claim is broader than those findings: the Results report no difference in SF-12 mental-component scores, and do not establish reductions across all LLFDI components. (LLM, conf=0.86)

  cites [207] Batsis, J. A., Zbehlik, A. J., Pidgeon, D. & Bartels, S. J. Dynapenic obesity and the effect on long-term physical function and quality of life: data from the osteoarthritis initiative. BMC Geriatr. 15, 118 (2015). sourceExperimental — accuracy not yet measured

In the paper

“while data from FNIH classified 4.1% of men and 14.0% of women as having sarcopenic obesity using high BMI and low grip strength as measures of obesity and low muscle strength, respectively202.”

What the sources say

• Partly supported

  Table 1 in the Results reports that 4.1% of obese men had weak grip strength, and the Results state that 14% of obese women were classified as weak. These percentages are among obese participants, not among all men and women; the paper also does not classify them as having “sarcopenic obesity.” (LLM, conf=0.90)

  cites [202] Alley, D. E. et al. Grip strength cutpoints for the identification of clinically relevant weakness. J. Gerontol. A Biol. Sci. Med. Sci. 69, 559–566 (2014). sourceExperimental — accuracy not yet measured

In the paper

“a combination of weight loss and regular exercise improved physical function and ameliorated frailty more than either intervention alone246”

What the sources say

• Supported

  The Discussion states that, in obese older adults, weight loss plus exercise improved physical function and ameliorated frailty more than either intervention alone. It also describes the participants as having mild-to-moderate frailty and sarcopenic obesity. The supplied passages do not give page numbers. (LLM, conf=0.94)

  cites [246] Villareal, D. T. et al. Weight loss, exercise, or both and physical function in obese older adults. N. Engl. J. Med. 364, 1218–1229 (2011). This is a randomized trial of older adults with frailty and obesity that compares diet, exercise type and controls and demonstrates that physical function improves and muscle and bone loss is mitigated with concomitant exercise therapy. source

In the paper

“reduced leg isometric strength and increased waist circumference were associated with increased mortality232 (HR 2.46, 95% CI 1.34–4.52)”

What the sources say

• Supported

  The Abstract reports that leg isometric strength and waist circumference were measured and that participants with both low strength and abdominal obesity had an adjusted mortality HR of 2.46 (95% CI 1.34–4.52). The Discussion likewise identifies this group as having the highest all-cause mortality risk. (LLM, conf=0.94)

  cites [232] Rossi, A. P. et al. Dynapenic abdominal obesity as predictor of mortality and disability worsening in older adults: a 10-year prospective study. Clin. Nutr. 35, 199–204 (2016). source

In the paper

“higher doses have recently demonstrated no changes in lean mass273”

What the sources say

• Supported

  The Lean Body Mass section reports no significant effect of increasing protein intake from 0.8 to 1.3 g/kg/day on lean body mass over six months. This supports the claim as a statement about the effect of higher protein intake, not an assertion that no participant’s lean mass changed; the trial studied functionally limited older men. (LLM, conf=0.91)

  cites [273] Bhasin, S. et al. Effect of protein intake on lean body mass in functionally limited older men: a randomized clinical trial. JAMA Intern. Med. 178, 530–541 (2018). source

In the paper

“investigators reported a 16% reduction in mortality (95% CI 0.71–0.99)243”

What the sources say

• Partly supported

  The Results section (‘Sub-analyses: modifying effects of age, follow up duration, and magnitude of weight loss’) reports a 16% lower mortality estimate (RR 0.84; 95% CI 0.71–0.99) for trials with a mean participant age ≥55 years. Follow-up ≥4 years was a separate subgroup, with a different estimate (RR 0.85; 95% CI 0.72–1.00). The cited result therefore does not establish the claimed combined age-and-follow-up subgroup. (LLM, conf=0.90)

  cites [243] Kritchevsky, S. B. et al. Intentional weight loss and all-cause mortality: a meta-analysis of randomized clinical trials. PLoS ONE 10, e0121993 (2015). This is an important meta-analysis that evaluates randomized controlled trials of weight loss interventions in older adults and their impact on mortality. sourceExperimental — accuracy not yet measured

In the paper

“Early pilot studies demonstrate that meals enhanced with protein and coupled with a weight loss intervention improve physical function263.”

What the sources say

• Supported

  The Results report that participants on the protein-enhanced weight-loss diet improved physical function more than those on the traditional weight-loss diet. The Discussion identifies this as a pilot trial in frail, obese older adults. (LLM, conf=0.93)

  cites [263] Porter Starr, K. N. et al. Improved function with enhanced protein intake per meal: a pilot study of weight reduction in frail, obese older adults. J. Gerontol. A Biol. Sci. Med. Sci. 71, 1369–1375 (2016). source

In the paper

“Cutoffs specific to individuals from South Korea predicted higher mortality risk than the FNIH cut-off233.”

What the sources say

• Partly supported

  The Discussion reports that lowest-quintile cutoffs specific to the Korean study population predicted mortality more accurately than FNIH cutoffs. It also says these associations were observed only in men, not women, so the claim is broader than the finding. (LLM, conf=0.87)

  cites [233] Moon, J. H. et al. Predictive values of the new sarcopenia index by the Foundation for the National Institutes of Health sarcopenia project for mortality among older Korean adults. PLoS ONE 11, e0166344 (2016). sourceExperimental — accuracy not yet measured

In the paper

“a high- protein diet in conjunction with resistance training preserved appendicular lean mass during weight loss264”

What the sources say

• Partly supported

  The Discussion reports that only the combined high-protein and resistance-exercise group significantly increased fat-free mass during weight loss, while finding no significant interaction between the interventions. The Methods describe measurement of whole-body fat-free mass, not appendicular lean mass, so the cited paper does not establish preservation of that specific outcome. (LLM, conf=0.88)

  cites [264] Verreijen, A. M. et al. Effect of a high protein diet and/or resistance exercise on the preservation of fat free mass during weight loss in overweight and obese older adults: a randomized controlled trial. Nutr. J. 16, 10 (2017). sourceExperimental — accuracy not yet measured

In the paper

“an elevated BMI is associated with admission to a nursing home240”

What the sources say

• Partly supported

  The Results section reports increased nursing-home admission risk for white adults with BMI of 30 or higher, but not for those with BMI of 25 to under 30. It reports no significant increased risk among Black adults. The claim omits these limits and therefore overgeneralizes the association. (LLM, conf=0.89)

  cites [240] Zizza, C. A., Herring, A., Stevens, J. & Popkin, B. M. Obesity affects nursing-care facility admission among whites but not blacks. Obes. Res. 10, 816–823 (2002). sourceExperimental — accuracy not yet measured

In the paper

“Energy deficits created by acute calorie restriction could downregulate muscle protein synthesis and increase proteolysis, which contributes to reduced muscle mass247,253,254”

What the sources say

• Partly supported

  The Results (Body Composition; page not available in our copy) report decreased lean mass during the six-month weight-loss intervention, supporting the reduced-mass portion of the claim. The Methods describe a sustained dietary energy deficit, but the paper does not report whether acute calorie restriction downregulates muscle protein synthesis or increases proteolysis. (LLM, conf=0.88)

  cites [247] Villareal, D. T. et al. Aerobic or resistance exercise, or both in dieting obese older adults. N. Engl. J. Med. 376, 1943–1955 (2017). This is a randomized trial of older adults with obesity and frailty demonstrating that weight loss coupled with both aerobic and resistance activities is associated with improved physical function. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [253] Areta, J. L. et al. Reduced resting skeletal muscle protein synthesis is rescued by resistance exercise and protein ingestion following short-term energy deficit. Am. J. Physiol. Endocrinol. Metab. 306, E989–E997 (2014). source
• ?Not checked — no full text of the sourcecites [254] Pasiakos, S. M. et al. Effects of high-protein diets on fat-free mass and muscle protein synthesis following weight loss: a randomized controlled trial. FASEB J. 27, 3837–3847 (2013). source

In the paper

“Generally, 25.0–30.0 g of protein containing 2.5–2.8 g of leucine can slow frailty261,262.”

What the sources say

• Partly supported

  The Results and Discussion report that higher protein intake was associated with lower incidence of frailty in older women. Our copy gives no 25.0–30.0 g protein or 2.5–2.8 g leucine recommendation (searched those amounts and leucine), and this observational association does not establish that such an intake slows frailty. (LLM, conf=0.89)

  cites [261] Beasley, J. M. et al. Protein intake and incident frailty in the Women’s Health Initiative observational study. J. Am. Geriatr. Soc. 58, 1063–1071 (2010). sourceExperimental — accuracy not yet measured
• Partly supported

  The indexed title reports that protein supplementation improved physical performance in frail elderly people. The retrieved passages do not establish that 25.0–30.0 g of protein containing 2.5–2.8 g of leucine slows frailty; searches for the amounts and for frailty progression found no supporting passage. (LLM, conf=0.72)

  cites [262] Tieland, M. et al. Protein supplementation improves physical performance in frail elderly people: a randomized, double-blind, placebo-controlled trial. J. Am. Med. Dir. Assoc. 13, 720–726 (2012). sourceExperimental — accuracy not yet measured

In the paper

“participants with sarcopenic obesity undergoing a weight loss programme augmented by a high-protein diet showed improvements in muscle strength and Short Form-36 scores (REF265)”

What the sources say

• Partly supported

  The Results (p. 5) report significantly improved muscle strength in the high-protein group. They report a significant improvement in only the general-health score of the SF-36; the other SF-36 categories did not change significantly, so the claim is too broad about SF-36 scores. (LLM, conf=0.87)

  cites [265] Sammarco, R. et al. Evaluation of hypocaloric diet with protein supplementation in middle-aged sarcopenic obese women: a pilot study. Obes. Facts 10, 160–167 (2017). sourceExperimental — accuracy not yet measured

In the paper

“The rate of depression has been reported as being highest in patients with sarcopenic obesity (defined as low handgrip strength and obesity defined by BMI) (OR 1.79, 95% CI 1.10–2.89) over 4 years222”

What the sources say

• Partly supported

  The Results report an adjusted OR of 1.79 (95% CI 1.10–2.89) for new-onset depressive symptoms in obese adults with low grip strength versus non-obese adults with high grip strength. However, the outcome was assessed at six-year follow-up; four years refers to the interval over which grip-strength change was measured in a separate analysis. (LLM, conf=0.90)

  cites [222] Hamer, M., Batty, G. D. & Kivimaki, M. Sarcopenic obesity and risk of new onset depressive symptoms in older adults: English Longitudinal Study of Ageing. Int. J. Obes. (Lond.) 39, 1717–1720 (2015). This study includes longitudinal data that suggest an association between sarcopenic obesity and depression. sourceExperimental — accuracy not yet measured

In the paper

“Another study reported no differences in Short Form-36 scores, which provide a measure of quality of life235, between individuals with obesity and low handgrip strength and individuals with normal indices236.”

What the sources say

• Partly supported

  The Results (Table 3; page not available in our copy) report no statistically significant differences in SF-36 domains between older women classified with and without sarcopenic obesity. But classification was based on body-composition measures, not low handgrip strength; the comparison group was women without sarcopenic obesity, not necessarily women with normal indices. (LLM, conf=0.88)

  cites [236] Silva Neto, L. S., Karnikowiski, M. G., Tavares, A. B. & Lima, R. M. Association between sarcopenia, sarcopenic obesity, muscle strength and quality of life variables in elderly women. Rev. Bras. Fisioter. 16, 360–367 (2012). sourceExperimental — accuracy not yet measured

In the paper

“weight loss plus combined aerobic and resistance exercise was the most effective method for improving functional status of adults aged 65 years and older with obesity247”

What the sources say

• Supported

  The Abstract Conclusions state that, of the methods tested, weight loss plus combined aerobic and resistance exercise was most effective for improving functional status in obese older adults. The Discussion specifies that the trial involved adults aged 65 or older and found greater improvement in physical function than with either exercise type alone. (LLM, conf=0.94)

  cites [247] Villareal, D. T. et al. Aerobic or resistance exercise, or both in dieting obese older adults. N. Engl. J. Med. 376, 1943–1955 (2017). This is a randomized trial of older adults with obesity and frailty demonstrating that weight loss coupled with both aerobic and resistance activities is associated with improved physical function. source

In the paper

“the combination of obesity as defined by BMI and low handgrip strength suggested an increased risk of type 2 diabetes mellitus (OR 3.57, 95% CI 2.04–6.24)”

What the sources say

• ?Could not verify

  The Methods define obesity by waist circumference and sarcopenia by midarm muscle circumference, not BMI and handgrip strength. The Results report cardiovascular events and mortality; a search for type 2 diabetes and the stated OR and confidence interval found no matching result in our copy. (LLM, conf=0.76)

  cites [221] Atkins, J. L. et al. Sarcopenic obesity and risk of cardiovascular disease and mortality: a population-based cohort study of older men. J. Am. Geriatr. Soc. 62, 253–260 (2014). sourceExperimental — accuracy not yet measured

In the paper

“risk of falling was highest in individuals with low muscle mass and/or strength with obesity as defined by percentage of body fat219”

What the sources say

• Partly supported

  The Discussion reports that obesity combined with low muscle strength, but not low muscle mass, predicted an increased falls-risk score over five years in community-dwelling middle-aged and older adults. The Operational definitions section defines obesity by high DXA-assessed total or trunk fat mass, not percentage body fat; the study measured a risk score rather than observed falls. (LLM, conf=0.90)

  cites [219] Scott, D. et al. Sarcopenic obesity and dynapenic obesity: 5-year associations with falls risk in middle-aged and older adults. Obesity (Silver Spring) 22, 1568–1574 (2014). sourceExperimental — accuracy not yet measured

In the paper

“The EuroQOL score was dependent on cardiovascular fitness rather than sarcopenic obesity237.”

What the sources say

• Partly supported

  The Results (page unavailable) associate better EuroQol-rated perceived health with higher aerobic fitness, supporting the cardiovascular-fitness part of the claim. But Table 2 and the Statistical analysis section also report differences in health-related quality of life across sarcopenic-obesity groups; the paper does not establish that the score depends on fitness rather than sarcopenic obesity. (LLM, conf=0.86)

  cites [237] Pedrero-Chamizo, R. et al. Higher levels of physical fitness are associated with a reduced risk of suffering sarcopenic obesity and better perceived health among the elderly: the EXERNET multi-center study. J. Nutr. Health Aging 19, 211–217 (2015). sourceExperimental — accuracy not yet measured

In the paper

“High protein intake (1.2 g of protein per kg per day) during weight loss might eliminate the beneficial effect of weight loss on insulin sensitivity in skeletal muscle258.”

What the sources say

• Supported

  The Discussion reports that participants receiving 1.2 g protein/kg/day during approximately 10% weight loss did not gain the improvement in muscle insulin action seen with the standard-protein diet. The study was conducted in postmenopausal women with obesity, and the citing sentence’s cautious “might” is consistent with that finding. (LLM, conf=0.94)

  cites [258] Smith, G. I. et al. High-protein intake during weight loss therapy eliminates the weight-loss-induced improvement in insulin action in obese postmenopausal women. Cell Rep. 17, 849–861 (2016). source

In the paper

“Strategies that optimize protein anabolism during weight loss, such as consumption before exercise or spreading out of protein during the day, can prevent weight loss-induced sarcopenia247,250.”

What the sources say

• Partly supported

  The Discussion (page not provided) suggests improving the efficiency of protein intake as a possible future strategy to preserve lean mass during weight loss. It does not mention protein consumption before exercise or distributing protein across the day, and reports that lean-mass loss was attenuated, not prevented. (LLM, conf=0.88)

  cites [247] Villareal, D. T. et al. Aerobic or resistance exercise, or both in dieting obese older adults. N. Engl. J. Med. 376, 1943–1955 (2017). This is a randomized trial of older adults with obesity and frailty demonstrating that weight loss coupled with both aerobic and resistance activities is associated with improved physical function. sourceExperimental — accuracy not yet measured
• Partly supported

  The Discussion (page not provided) says that caloric reduction with appropriate protein supplementation and resistance exercise may prevent sarcopenia in older adults with obesity. It does not address consuming protein before exercise or spreading intake throughout the day, and its conclusion is more cautious than the claim’s “can prevent.” (LLM, conf=0.87)

  cites [250] Batsis, J. A. et al. Weight loss interventions in older adults with obesity: a systematic review of randomized controlled trials since 2005. J. Am. Geriatr. Soc. 65, 257–268 (2017). This is a comprehensive systematic review of randomized trials in older adults with obesity highlighting the importance of the improvement in physical function through diet and exercise. sourceExperimental — accuracy not yet measured

In the paper

“reduced muscle strength is associated with increased mortality (HR 1.30, 95% CI 1.09–1.54)228”

What the sources say

• Partly supported

  The Abstract Results report HR 1.30 (95% CI 1.09–1.54), but specifically for participants aged 70 or older with normal weight and low handgrip strength, compared with normal-weight participants with high handgrip strength. The citing sentence omits those age, weight, and comparator qualifications and presents the estimate as applying to reduced strength generally. (LLM, conf=0.90)

  cites [228] Stenholm, S. et al. Obesity and muscle strength as long-term determinants of all-cause mortality — a 33-year follow-up of the Mini-Finland Health Examination Survey. Int. J. Obes. (Lond.) 38, 1126–1132 (2014). sourceExperimental — accuracy not yet measured

In the paper

“Increased dietary protein stimulates muscle protein synthesis71,256.”

What the sources say

• Supported

  The Protein or Amino Acid Supplementation section states that dietary protein supplementation promotes protein synthesis in older people. The Benefits of Higher Protein Intake for Older Adults section also describes sufficient protein intake as a way to maximize muscle protein anabolism. The paper supports the claim in its older-adult context. (LLM, conf=0.90)

  cites [71] Bauer, J. et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J. Am. Med. Dir. Assoc. 14, 542–559 (2013). This is a position paper from the PROT-Age study group that recommends an average daily intake of at least 1.0–1.2 g protein per kg body weight per day. source
• ?Not checked — no full text of the sourcecites [256] Wolfe, R. R., Miller, S. L. & Miller, K. B. Optimal protein intake in the elderly. Clin. Nutr. 27, 675–684 (2008). source

In the paper

“identified 33 trials that significantly improved physical abilities (standardized mean difference 0.14, 95% CI 0.05–0.22) in 2,172 participants”

What the sources say

• Supported

  The Results, under “PRT versus control,” report a significant decrease in disability across 33 trials and 2,172 participants (SMD 0.14, 95% CI 0.05 to 0.22). The 33 trials are those pooled for this outcome, not all trials included in the review. (LLM, conf=0.95)

  cites [281] Liu, C. J. & Latham, N. K. Progressive resistance strength training for improving physical function in older adults. Cochrane Database Syst. Rev. 3, CD002759 (2009). This is a systematic Cochrane review of randomized controlled trials reporting physical outcomes of progressive resistance therapy that demonstrates improved strength and performance. source

In the paper

“Obesity is inversely related to BMD and fractures313 but might increase the fracture risk through bone quality314,315 or frailty132,316 independent of BMD.”

What the sources say

• Supported

  The Discussion reports that obesity was associated with greater fracture risk in older men after adjustment for BMD, partly explained by deficits in physical performance. This supports the hedged suggestion of a frailty-related pathway; the bone-quality portion of the citing sentence is attached to other citations. (LLM, conf=0.90)

  cites [314] Nielson, C. M. et al. BMI and fracture risk in older men: the osteoporotic fractures in men study (MrOS). J. Bone Miner. Res. 26, 496–502 (2011). source
• Partly supported

  The Discussion reports more falls and several markers of frailty among obese women with fractures, and suggests these may help explain their fracture risk. It also cautions that higher BMD may not confer greater bone strength, but it does not establish that frailty increases fracture risk independently of BMD. The bone-quality portion of the citing sentence has separate citations. (LLM, conf=0.82)

  cites [315] Compston, J. E. et al. Obesity is not protective against fracture in postmenopausal women: GLOW. Am. J. Med. 124, 1043–1050 (2011). sourceExperimental — accuracy not yet measured
• Partly supported

  The Results report that 96% of the obese elderly subjects met the study’s frailty criteria, and the Discussion associates obesity with physical frailty despite greater bone mass than in the nonobese groups. The paper does not establish that frailty increases fracture risk independently of BMD; it says the implications of the greater bone mass for fracture risk are unknown. Bone quality is not the part of the citing sentence attributed to this source. (LLM, conf=0.85)

  cites [132] Villareal, D. T., Banks, M., Siener, C., Sinacore, D. R. & Klein, S. Physical frailty and body composition in obese elderly men and women. Obes. Res. 12, 913–920 (2004). sourceExperimental — accuracy not yet measured
• Partly supported

  The Results report that frail older men had higher age-adjusted nonspine fracture risk, and the multivariable prediction models included femoral-neck BMD. The paper does not show that obesity increases fracture risk through frailty, or establish frailty as a causal pathway independent of BMD; bone quality is associated with other citations in the citing sentence. (LLM, conf=0.85)

  cites [316] Ensrud, K. E. et al. A comparison of frailty indexes for the prediction of falls, disability, fractures, and mortality in older men. J. Am. Geriatr. Soc. 57, 492–498 (2009). sourceExperimental — accuracy not yet measured

In the paper

“adding aerobic activity to calorie restriction increased serum concentrations of adiponectin (6.9 μg/ml for individuals in the group without aerobic activity versus 8.5 μg/ml for individuals in the group with aerobic activity (P < 0.001))305”

What the sources say

• Partly supported

  The Methods and Results describe overweight or obese postmenopausal women and support an increase in circulating adiponectin when aerobic exercise was added to caloric restriction. The Results report post-intervention plasma concentrations of 5.2 μg/ml without exercise and 7.6 μg/ml with exercise, not the claimed 6.9 and 8.5 μg/ml; the group-by-time interaction had P = 0.014, while the increase within the exercise group had P = 0.0001. The paper measured plasma, rather than serum, adiponectin. (LLM, conf=0.91)

  cites [305] Wang, X., You, T., Murphy, K., Lyles, M. F. & Nicklas, B. J. Addition of exercise increases plasma adiponectin and release from adipose tissue. Med. Sci. Sports Exerc. 47, 2450–2455 (2015). sourceExperimental — accuracy not yet measured

In the paper

“the short physical performance battery — an objective assessment tool for the evaluation of lower extremity function (higher score equals better function)284 — of patients with sarcopenia improved from 7.4 to 8.7 when compared with the successful ageing group285”

What the sources say

• Partly supported

  The Results section, “Analysis of SPPB” (page unavailable), reports a 12-month SPPB score of 8.7 for sarcopenic participants in the physical-activity group and compares that group with the successful-aging group. Our copy does not establish the claimed starting score of 7.4. The reported difference between groups at 12 months was not statistically significant. (LLM, conf=0.84)

  cites [285] Liu, C. K. et al. The impact of sarcopenia on a physical activity intervention: the Lifestyle Interventions and Independence for Elders Pilot Study (LIFE-P). J. Nutr. Health Aging 18, 59–64 (2014). sourceExperimental — accuracy not yet measured

In the paper

“Adipose tissue has been shown to be inversely associated with bone material strength and positively associated with cortical porosity, indicating an adverse effect of adipose tissue on bone microstructure317.”

What the sources say

• Partly supported

  The Discussion (page not provided) reports that local tibial adipose tissue was inversely associated with bone material strength and positively associated with cortical porosity in older women. It describes a negative effect on cortical microstructure as possible, rather than establishing that adipose tissue has an adverse effect generally. (LLM, conf=0.86)

  cites [317] Sundh, D. et al. A high amount of local adipose tissue is associated with high cortical porosity and low bone material strength in older women. J. Bone Miner. Res. 31, 749–757 (2016). sourceExperimental — accuracy not yet measured

In the paper

“Unopposed diet therapy without exercise in older frail adults ≥65 years with obesity (BMI ≥30 kg/m2) led to a marked loss of lean mass at 6 months and 1 year (−3.5 kg and −3.2 kg, respectively) compared with the diet and exercise group, where the loss of lean mass was partially mitigated (−1.7 kg and −1.8 kg, respectively)246.”

What the sources say

• Partly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [246] Villareal, D. T. et al. Weight loss, exercise, or both and physical function in obese older adults. N. Engl. J. Med. 364, 1218–1229 (2011). This is a randomized trial of older adults with frailty and obesity that compares diet, exercise type and controls and demonstrates that physical function improves and muscle and bone loss is mitigated with concomitant exercise therapy. sourceExperimental — accuracy not yet measured

In the paper

“aquatic exercises are as effective as land-based exercises (standardized mean difference 0.39, 95% CI 0.12–0.66)”

What the sources say

• Supported

  The Abstract reports an SMD of 0.39 (95% CI 0.12–0.66) for aquatic versus land-based exercise on physical functioning. The Discussion concludes that aquatic exercise appears at least as effective, while cautioning that the evidence has high heterogeneity and risk of bias. (LLM, conf=0.93)

  cites [294] Waller, B. et al. The effect of aquatic exercise on physical functioning in the older adult: a systematic review with meta-analysis. Age Ageing 45, 593–601 (2016). source

In the paper

“A meta-analysis of 18 trials (n = 3,824), including study participants greater than 65 years who participated in tai chi for a minimum of 4 weeks (range 1–12 months) 1–3 times per week, demonstrated a reduction in falls of 20% (relative risk (RR) 0.8, 95% CI 0.72–0.88)292.”

What the sources say

• Partly supported

  The Abstract Results report 18 trials with 3,824 participants and RR 0.80 (95% CI 0.72–0.88), but the Results section specifies that this estimate for the number of fallers came from 16 studies with 3,539 participants. The Methods allowed participants over 60, or trials with an average age over 65, rather than requiring every participant to be over 65. The study-characteristics table also includes Tai Chi schedules longer than 12 months and more frequent than three times weekly, so the stated duration and frequency ranges do not describe all included trials. (LLM, conf=0.91)

  cites [292] Huang, Z. G., Feng, Y. H., Li, Y. H. & Lv, C. S. Systematic review and meta-analysis: Tai Chi for preventing falls in older adults. BMJ Open 7, e013661 (2017). sourceExperimental — accuracy not yet measured

In the paper

“In the Look AHEAD trial, total skeletal mass decreased in both of the intensive lifestyle groups and in the diabetes support and education group (−1.4 kg; P < 0.001).”

What the sources say

• Partly supported

  The Abstract reports that total skeletal muscle decreased by 1.4 kg in both groups during year 1 (P < 0.001), and the SM section identifies those groups as ILI and DSE. The claim incorrectly describes two intensive lifestyle groups; the study reports one ILI group and one DSE group. (LLM, conf=0.88)

  cites [310] Gallagher, D. et al. Changes in skeletal muscle and organ size after a weight-loss intervention in overweight and obese type 2 diabetic patients. Am. J. Clin. Nutr. 105, 78–84 (2017). sourceExperimental — accuracy not yet measured

In the paper

“demonstrated reduced persistent mobility disability (HR 0.72, 95% CI 0.57–0.91) compared with a health education programme”

What the sources say

• Supported

  The Results section (Major mobility disability) reports persistent mobility disability in 120/818 physical activity participants versus 162/817 health education participants, with HR 0.72 (95% CI 0.57–0.91). This directly supports the claimed reduction and comparator. (LLM, conf=0.95)

  cites [282] Pahor, M. et al. Effect of structured physical activity on prevention of major mobility disability in older adults: the LIFE study randomized clinical trial. JAMA 311, 2387–2396 (2014). This study reports on a gold standard, structured, long-term physical activity intervention, consisting of 3–4 times of aerobic, resistance and flexibility training per week, that demonstrates improvements in mobility disability over a 2.6-year follow-up. source

In the paper

“improvements in muscle strength (standardized mean difference 0.84, 95% CI 0.67–1.00) in 73 trials281 (3,059 participants)”

What the sources say

• Supported

  The Results (‘Effects of interventions,’ Strength) report that 73 studies involving 3,059 participants found a beneficial effect of progressive resistance training on strength: SMD 0.84 (95% CI 0.67–1.00). The pooled measure was specifically strength of a lower-limb extensor muscle group. (LLM, conf=0.94)

  cites [281] Liu, C. J. & Latham, N. K. Progressive resistance strength training for improving physical function in older adults. Cochrane Database Syst. Rev. 3, CD002759 (2009). This is a systematic Cochrane review of randomized controlled trials reporting physical outcomes of progressive resistance therapy that demonstrates improved strength and performance. source

In the paper

“The addition of weight loss of 0.3 kg per week for 6 months to physical activity in older community-dwelling adults with obesity or overweight results in a greater reduction in serum levels of leptin and IL-6 than either physical activity alone or a successful ageing health education intervention308.”

What the sources say

• Supported

  Split into 2 atoms — 2 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [308] Beavers, K. M., Ambrosius, W. T., Nicklas, B. J. & Rejeski, W. J. Independent and combined effects of physical activity and weight loss on inflammatory biomarkers in overweight and obese older adults. J. Am. Geriatr. Soc. 61, 1089–1094 (2013). source

In the paper

“A meta-analysis of 28 studies demonstrated a positive effect of aquatic exercises on physical functioning (RR 0.70, 95% CI 0.48–0.92) compared with no training (control group)294.”

What the sources say

• Partly supported

  The Abstract (p. 1) reports a positive effect of aquatic exercise versus control of 0.70 (95% CI 0.48–0.92), also reported in Results under “Aquatic exercise compared to control.” However, 28 studies were included in the systematic review, only 24 in the meta-analysis, and the effect measure was a standardised mean difference, not a risk ratio (RR). (LLM, conf=0.94)

  cites [294] Waller, B. et al. The effect of aquatic exercise on physical functioning in the older adult: a systematic review with meta-analysis. Age Ageing 45, 593–601 (2016). sourceExperimental — accuracy not yet measured

In the paper

“two versus three training sessions per week for 12 weeks of high-speed resistance training were equally effective for improving physical performance and quality of life288”

What the sources say

• Partly supported

  The Discussion states that two and three HSRT sessions per week were equally effective for physical performance and quality of life, and the Methods specify a 12-week intervention. The Conclusion limits that finding to older women when training volume and intensity were equated; the citing sentence omits those conditions and reads more broadly. (LLM, conf=0.85)

  cites [288] Ramirez-Campillo, R. et al. Effects of different doses of high-speed resistance training on physical performance and quality of life in older women: a randomized controlled trial. Clin. Interv. Aging 11, 1797–1804 (2016). sourceExperimental — accuracy not yet measured

In the paper

“the positive effects on circulating cytokines, adiponectin and TNF were due to diet and not exercise301”

What the sources say

• Supported

  The Abstract (Results) reports similar improvements in adiponectin and the TNF-related measure in the diet and diet-exercise groups, with no changes in the exercise-only group. The Results (Adipocytokines) identify the TNF-related measure more precisely as soluble TNF receptor 1 (sTNF R1). (LLM, conf=0.92)

  cites [301] Bouchonville, M. et al. Weight loss, exercise or both and cardiometabolic risk factors in obese older adults: results of a randomized controlled trial. Int. J. Obes. (Lond.) 38, 423–431 (2014). source

In the paper

“levels of C-reactive protein and IL-6 decreased in older adults (age ≥65 years) with obesity (BMI ≥30 kg/m2) compared with controls (−2.5 versus 0.8 mg/l (P < 0.05) and −2.4 versus 1.6 pg/ml (P < 0.05), respectively)300”

What the sources say

• Supported

  Split into 2 atoms — 2 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [300] Villareal, D. T. et al. Effect of lifestyle intervention on metabolic coronary heart disease risk factors in obese older adults. Am. J. Clin. Nutr. 84, 1317–1323 (2006). source

In the paper

“The addition of pharmacotherapy, such as testosterone supplementation, to progressive resistance training augmented the improvements in body composition, including reduced fat mass and improved lean mass357.”

What the sources say

• Supported

  The Body composition results report that, among men assigned to progressive resistance training, those receiving testosterone had a greater reduction in fat mass and a greater increase in fat-free mass than those receiving placebo. The Body composition discussion explicitly states that testosterone plus training produced greater improvements in both measures than placebo plus training. The study population was generally healthy older men with low-normal testosterone levels. (LLM, conf=0.94)

  cites [357] Hildreth, K. L. et al. Effects of testosterone and progressive resistance exercise in healthy, highly functioning older men with low-normal testosterone levels. J. Clin. Endocrinol. Metab. 98, 1891–1900 (2013). source

In the paper

“Summative effects of the combination of whole body vibration therapy and resistance exercises374–377 or of whole-body vibration therapy and vitamin D367 are mixed.”

What the sources say

• ?Not checked — no full text of the sourcecites [374] Bemben, D. A., Palmer, I. J., Bemben, M. G. & Knehans, A. W. Effects of combined whole-body vibration and resistance training on muscular strength and bone metabolism in postmenopausal women. Bone 47, 650–656 (2010). source
• ?Not checked — no full text of the sourcecites [375] Fjeldstad, C., Palmer, I. J., Bemben, M. G. & Bemben, D. A. Whole-body vibration augments resistance training effects on body composition in postmenopausal women. Maturitas 63, 79–83 (2009). source
• ?Not checked — no full text of the sourcecites [376] Machado, A., Garcia-Lopez, D., Gonzalez-Gallego, J. & Garatachea, N. Whole-body vibration training increases muscle strength and mass in older women: a randomized-controlled trial. Scand. J. Med. Sci. Sports 20, 200–207 (2010). source
• ?Not checked — no full text of the sourcecites [377] von Stengel, S., Kemmler, W., Engelke, K. & Kalender, W. A. Effect of whole-body vibration on neuromuscular performance and body composition for females 65 years and older: a randomized-controlled trial. Scand. J. Med. Sci. Sports 22, 119–127 (2012). source
• Partly supported

  The Interaction effects section (page unavailable) reports no evidence of an interactive effect between whole-body vibration and vitamin D for any outcome. This supports a lack of additional benefit from the combination in this trial, but the paper does not itself report mixed effects of that combination. The resistance-exercise clause is attributed to other citations, not this source. (LLM, conf=0.78)

  cites [367] Verschueren, S. M. et al. The effects of whole-body vibration training and vitamin D supplementation on muscle strength, muscle mass, and bone density in institutionalized elderly women: a 6-month randomized, controlled trial. J. Bone Miner. Res. 26, 42–49 (2011). sourceExperimental — accuracy not yet measured

In the paper

“Studies emphasize exercise training during calorie restriction to prevent an increase in bone turn-over327 and an increase in serum levels of sclerostin328, thus minimizing bone loss.”

What the sources say

• Supported

  The Results report that bone-turnover markers increased with diet alone but did not significantly change with diet plus exercise. The Discussion reports that exercise attenuated the weight-loss-induced decrease in hip BMD. In the citing sentence, this paper is cited for bone turnover (327); the sclerostin claim has a separate citation (328). (LLM, conf=0.93)

  cites [327] Shah, K. et al. Exercise training in obese older adults prevents increase in bone turnover and attenuates decrease in hip bone mineral density induced by weight loss despite decline in bone-active hormones. J. Bone Miner. Res. 26, 2851–2859 (2011). source
• Supported

  The Discussion reports that adding exercise training to diet prevented the weight-loss-induced rise in sclerostin and attenuated bone loss in obese older adults. It also states that exercise prevented an increase in bone-turnover markers, while noting that this result had been reported previously. (LLM, conf=0.92)

  cites [328] Armamento-Villareal, R. et al. Weight loss in obese older adults increases serum sclerostin and impairs hip geometry but both are prevented by exercise training. J. Bone Miner. Res. 27, 1215–1221 (2012). source

In the paper

“These findings suggest that BMD and markers of bone turnover following long-term calorie restriction show larger changes in patients than in healthy control participants advised to continue their current diet322.”

What the sources say

• Partly supported

  The Abstract reports greater BMD changes after 24 months of calorie restriction than with an ad libitum diet, and greater changes in several bone-turnover markers at 12 months; at 24 months, only BSAP differed between groups. The Methods (Participants and Study Design; page unavailable) say both groups were healthy volunteers and the controls were advised to continue their current diets, so describing the restriction group as “patients” is misleading. (LLM, conf=0.87)

  cites [322] Villareal, D. T. et al. Effect of two-year caloric restriction on bone metabolism and bone mineral density in non-obese younger adults: a randomized clinical trial. J. Bone Miner. Res. 31, 40–51 (2016). This is a 2-year randomized trial of caloric restriction, which had been previously shown to lead to bone loss at important sites of osteoporotic fractures as represented by reductions in BMD. sourceExperimental — accuracy not yet measured

In the paper

“Furthermore, trabecular geometry, cortical geometry and strength were no different in individuals undergoing intentional weight loss through calorie restriction or weight maintenance for 6 months324, which suggests that calorie restriction has protective effects on bone quality.”

What the sources say

• Supported

  The tibia Results (page not specified) report no significant changes in trabecular variables and generally no changes in cortical variables between the weight-loss and weight-maintenance groups over six months. The Discussion likewise reports no changes in cortical or trabecular bone variables in the men studied. The statement about protective effects follows the citation as the citing authors’ inference; the source establishes preservation, not an improvement in bone quality. (LLM, conf=0.87)

  cites [324] Pop, L. C. et al. Moderate weight loss in obese and overweight men preserves bone quality. Am. J. Clin. Nutr. 101, 659–667 (2015). source

In the paper

“In one study, the authors reported that trabecular bone microarchitecture was no different in calorie- restricted participants (~35% less calories than controls) than in middle-aged individuals eating a Western diet323.”

What the sources say

• Supported

  The Discussion reports that distal-radius trabecular bone microarchitecture, assessed by composite hr-MRI measures, was not significantly different between the calorie-restricted and Western-diet groups. The Abstract identifies the participants as middle-aged and reports that the calorie-restricted group consumed about 35% fewer calories than controls. (LLM, conf=0.92)

  cites [323] Villareal, D. T. et al. Reduced bone mineral density is not associated with significantly reduced bone quality in men and women practicing long-term calorie restriction with adequate nutrition. Aging Cell 10, 96–102 (2011). source

In the paper

“Periodized resistance training in older adults demonstrated equal efficacy in physical function and physiological outcomes when compared with non-periodized resistance training360.”

What the sources say

• Supported

  The Abstract reports that periodized and non-periodized resistance training produced improvements in physical function and physiological health outcomes with no between-group differences. Its conclusion calls the approaches equally effective in the studied population of apparently healthy, previously untrained older adults. (LLM, conf=0.94)

  cites [360] Conlon, J. A. et al. Periodization strategies in older adults: impact on physical function and health. Med. Sci. Sports Exerc. 48, 2426–2436 (2016). source

In the paper

“Supplementing vitamin D in patients with sarcopenic obesity can potentially influence and improve muscle function331 and proximal muscle weakness332 through the actions ofvitamin D metabolites333.”

What the sources say

• Partly supported

  The Discussion (page unavailable) links vitamin D metabolites to muscle function and gene expression, supporting the mechanism attributed to this source. But the study was cross-sectional in healthy volunteers; it did not test supplementation in patients with sarcopenic obesity or establish that supplementation improves muscle function or proximal weakness. (LLM, conf=0.86)

  cites [331] Hassan-Smith, Z. K. et al. 25-hydroxyvitamin D3 and 1,25-dihydroxyvitamin D3 exert distinct effects on human skeletal muscle function and gene expression. PLoS ONE 12, e0170665 (2017). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [332] Beaudart, C. et al. The effects of vitamin D on skeletal muscle strength, muscle mass, and muscle power: a systematic review and meta-analysis of randomized controlled trials. J. Clin. Endocrinol. Metab. 99, 4336–4345 (2014). source
• ?Not checked — no full text of the sourcecites [333] Malafarina, V., Uriz-Otano, F., Malafarina, C., Martinez, J. A. & Zulet, M. A. Effectiveness of nutritional supplementation on sarcopenia and recovery in hip fracture patients. A multi-centre randomized trial. Maturitas 101, 42–50 (2017). source

In the paper

“Older adults often receive gold standard imaging, which can accurately ascertain muscle and fat content, for indications other than sarcopenic obesity, such as abdominal pain or back pain342,343.”

What the sources say

• ?Not checked — no full text of the sourcecites [342] Maddalo, M. et al. Validation of a free software for unsupervised assessment of abdominal fat in MRI. Phys. Med. 37, 24–31 (2017). source
• Partly supported

  The Materials and Methods (Patients; page unavailable) say the abdominal CT scans were routinely obtained for rectal-cancer workup or treatment assessment, not for body-composition assessment. The Abstract (Conclusions; page unavailable) reports excellent agreement in muscle and fat measurements across software and observers. The paper does not establish that older adults often receive such imaging for abdominal or back pain, or that it is a gold-standard measure of accuracy. (LLM, conf=0.87)

  cites [343] van Vugt, J. L. A. et al. A comparative study of software programmes for cross-sectional skeletal muscle and adipose tissue measurements on abdominal computed tomography scans of rectal cancer patients. J. Cachexia Sarcopenia Muscle 8, 285–297 (2017). sourceExperimental — accuracy not yet measured

In the paper

“Whole-body vibration therapy uses the transmission of mechanical stimuli through the person’s body365,366 to activate the primary ends of muscle spindles, which leads to neuromuscular activation367–369.”

What the sources say

• Partly supported

  The Discussion says vibration delivers energy to the body and identifies reflex muscle contraction during WBV as a possible stimulus to the muscle–nerve system. It does not identify activation of the primary endings of muscle spindles as the mechanism; the passages have no page numbers. (LLM, conf=0.84)

  cites [365] Rogan, S., Hilfiker, R., Herren, K., Radlinger, L. & de Bruin, E. D. Effects of whole-body vibration on postural control in elderly: a systematic review and meta-analysis. BMC Geriatr. 11, 72 (2011). sourceExperimental — accuracy not yet measured
• Partly supported

  The Background and Methods > Protocol describe participants standing on vibrating platforms and receiving whole-body vibration, supporting the mechanical-stimulation part of the claim. The cited paper does not describe activation of muscle-spindle primary endings or establish that mechanism for neuromuscular activation; the citing sentence places separate citations after that clause. No page numbers are available in our copy. (LLM, conf=0.82)

  cites [366] Rogan, S. et al. Feasibility and effects of applying stochastic resonance whole-body vibration on untrained elderly: a randomized crossover pilot study. BMC Geriatr. 15, 25 (2015). sourceExperimental — accuracy not yet measured
• Supported

  The Introduction states that vibrations from the platform transmit mechanical stimuli to the body, stimulating the primary endings of muscle spindles and resulting in neuronal activation and muscle contractions. This supports the claimed mechanism; the paper does not give a page number in the supplied passage. (LLM, conf=0.94)

  cites [367] Verschueren, S. M. et al. The effects of whole-body vibration training and vitamin D supplementation on muscle strength, muscle mass, and bone density in institutionalized elderly women: a 6-month randomized, controlled trial. J. Bone Miner. Res. 26, 42–49 (2011). source
• Supported

  The citation is attached to the transmission of mechanical stimuli through the body. The Introduction (page not specified) describes a vibrating platform whose oscillations are transmitted to the body; it also says they stimulate muscle spindles to produce contractions. (LLM, conf=0.92)

  cites [368] Cardim, A. B. et al. Does whole-body vibration improve the functional exercise capacity of subjects with COPD? A meta-analysis. Respir. Care 61, 1552–1559 (2016). source
• Supported

  The Working Hypothesis and Its Implications section (page not provided) says vibration produces group Ia spindle-afferent activity that excites motoneurones. The Muscle Vibration section (page not provided) reports vibration-induced motor-unit discharges. These passages support the spindle-to-neuromuscular-activation mechanism for which this citation is offered. (LLM, conf=0.85)

  cites [369] Burke, D. & Schiller, H. H. Discharge pattern of single motor units in the tonic vibration reflex of human triceps surae. J. Neurol. Neurosurg. Psychiatry 39, 729–741 (1976). source

In the paper

“Loss of BMD in older adults with obesity seems to continue during long-term lifestyle change in the opposite direction to the weight changes321.”

What the sources say

• Supported

  The Results (page unavailable) report a progressive decline in total-hip BMD over 30 months. The Discussion (page unavailable) reports that weight loss was about 10% at 12 months but 7% at 30 months, indicating some weight regain while hip BMD continued to fall. The finding concerns hip BMD, not whole-body or lumbar-spine BMD. (LLM, conf=0.88)

  cites [321] Waters, D. L. et al. Long-term maintenance of weight loss after lifestyle intervention in frail, obese older adults. J. Nutr. Health Aging 17, 3–7 (2013). source

In the paper

“However, 2017 data from the Look AHEAD trial showed that long-term intentional weight loss was associated with a 39% increased risk of fragility fractures325.”

What the sources say

• Partly supported

  The Results report a 39% higher risk of frailty fracture in the intensive lifestyle intervention group than in the diabetes support and education group. The Methods define that endpoint by fracture site—hip, pelvis, upper arm, or shoulder—not as fragility fractures, so the cited figure does not establish the claim for fragility fractures. (LLM, conf=0.86)

  cites [325] Johnson, K. C. et al. The effect of intentional weight loss on fracture risk in persons with diabetes: results from the Look AHEAD randomized clinical trial. J. Bone Miner. Res. 32, 2278–2287 (2017). sourceExperimental — accuracy not yet measured

In the paper

“For instance, leucine-rich protein can activate metabolic pathways involved in testosterone and IGF1 homeostasis348–351.”

What the sources say

• Partly supported

  The section “Optimizing the quality and utilization of protein intake on a per meal basis” (page unavailable) says leucine-rich protein can activate mTOR signaling involved in muscle protein synthesis. It does not link that activation to testosterone or IGF1 homeostasis; its separate mention of testosterone concerns pharmaceutical therapy. (LLM, conf=0.87)

  cites [348] Witard, O. C., McGlory, C., Hamilton, D. L. & Phillips, S. M. Growing older with health and vitality: a nexus of physical activity, exercise and nutrition. Biogerontology 17, 529–546 (2016). sourceExperimental — accuracy not yet measured
• ?Could not verify

  The Introduction (page unavailable) says resistance exercise acutely raises testosterone and IGF-1 and activates amino-acid-sensing pathways. Searches for “leucine-rich protein,” leucine, and testosterone found no passage saying that leucine-rich protein activates pathways involved in homeostasis of those hormones. The exercise findings do not establish the protein-specific claim. (LLM, conf=0.76)

  cites [349] Garatachea, N. et al. Exercise attenuates the major hallmarks of aging. Rejuvenation Res. 18, 57–89 (2015). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [350] Emmelot-Vonk, M. H. et al. Effect of testosterone supplementation on functional mobility, cognition, and other parameters in older men: a randomized controlled trial. JAMA 299, 39–52 (2008). source
• ?Not checked — no full text of the sourcecites [351] Travison, T. G. et al. Clinical meaningfulness of the changes in muscle performance and physical function associated with testosterone administration in older men with mobility limitation. J. Gerontol. A Biol. Sci. Med. Sci. 66, 1090–1099 (2011). source

In the paper

“In patients with sarcopenic obesity (defined using handgrip strength and BMI), no differences were observed in strength, power or short performance physical battery following a 10-week periodization strategy of strength and endurance training with concentric and eccentric movements290.”

What the sources say

• Partly supported

  Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [290] Vasconcelos, K. S. et al. Effects of a progressive resistance exercise program with high-speed component on the physical function of older women with sarcopenic obesity: a randomized controlled trial. Braz. J. Phys. Ther. 20, 432–440 (2016). sourceExperimental — accuracy not yet measured

In the paper

“Furthermore, trabecular geometry, cortical geometry and strength were no different in individuals undergoing intentional weight loss through calorie restriction or weight maintenance for 6 months324, which suggests that calorie restriction has protective effects on bone quality.”

What the sources say

• Supported

  The Abstract describes a six-month comparison of calorie-restricted weight loss and weight maintenance in overweight and obese men. The tibia Results report no significant trabecular changes and no significant between-group differences in the main cortical analysis, though cortical thickness and area showed trends. The Discussion reports little or no change in geometry or strength with weight loss. (LLM, conf=0.88)

  cites [324] Pop, L. C. et al. Moderate weight loss in obese and overweight men preserves bone quality. Am. J. Clin. Nutr. 101, 659–667 (2015). source

In the paper

“increased differences were reported in the disposition index (an index of insulin secretion after correction for insulin resistance) in the diet–exercise group (92.4 ± 11.4%) compared with the diet-only group (61.9 ± 15.3%) at 12 months320.”

What the sources say

• Supported

  Results §3.3 reports that at 12 months the disposition index increased more in the diet–exercise group (92.4 ± 11.4%) than in the diet-only group (61.9 ± 15.3%; P = 0.04). The same passage describes the index as adjusting insulin secretion for changes in insulin sensitivity. (LLM, conf=0.95)

  cites [320] Colleluori, G., Napoli, N., Phadnis, U., Armamento-Villareal, R. & Villareal, D. T. Effect of weight loss, exercise, or both on undercarboxylated osteocalcin and insulin secretion in frail, obese older adults. Oxid. Med. Cell. Longev. 2017, 4807046 (2017). source

In the paper

“Periodization, which is a systematic variation in physical training specificity, intensity and volume within periods, has emerged as a potential strategy to improve muscle performance358.”

What the sources say

• Supported

  The Introduction (page not specified) defines periodization as systematic variation in training specificity, intensity and volume. The Discussion (page not specified) reports significant improvements in muscular fitness in all included studies that measured it, supporting the claim that periodization is a potential strategy to improve muscle performance. (LLM, conf=0.91)

  cites [358] Strohacker, K., Fazzino, D., Breslin, W. L. & Xu, X. The use of periodization in exercise prescriptions for inactive adults: a systematic review. Prev. Med. Rep. 2, 385–396 (2015). source

In the paper

“In the ‘Testosterone Trials’, treatment with testosterone improved participants’ results in the 6 min walk test compared with placebo (20.5% versus 12.6%; P = 0.003)53.”

What the sources say

• Partly supported

  The Results > Efficacy section reports improved 6-minute walking outcomes with testosterone versus placebo among participants across all three Testosterone Trials, including P = 0.003 for the proportion whose walking distance increased by at least 50 m. Our copy does not give the cited 20.5% versus 12.6% figures. It also reports no significant difference for that outcome among participants in the Physical Function Trial alone. (LLM, conf=0.88)

  cites [53] Snyder, P. J. et al. Effects of testosterone treatment in older men. N. Engl. J. Med. 374, 611–624 (2016). This is a randomized trial of testosterone therapy in symptomatic older men that demonstrates no benefit in vitality or walking distance following supplementation. sourceExperimental — accuracy not yet measured

In the paper

“in men over 60 years with low testosterone, gains in lean mass following testosterone supplementation ranged from 1.6 kg to 6.20 kg (REF407).”

What the sources say

• Supported

  The Study selection criteria specify men over 60 with total testosterone levels ≤550 ng/dl. Data synthesis and sensitivity analysis reports lean-body-mass gains ranging from 1.65 to 6.20 kg with androgen therapy; the claim’s 1.6 kg is an approximate rendering of the lower bound. The paper reports substantial heterogeneity across trials. (LLM, conf=0.88)

  cites [407] Neto, W. K. et al. Effects of testosterone on lean mass gain in elderly men: systematic review with meta-analysis of controlled and randomized studies. Age (Dordr.) 37, 9742 (2015). This is a meta-analysis demonstrating that testosterone supplementation in elderly men leads to increases in lean mass and potentially reductions in fat mass. source

In the paper

“Elsewhere, testosterone-associated increases in lean mass were accompanied by improvements in handgrip strength, knee extension and leg press and chest press exercises415,416.”

What the sources say

• ?Not checked — no full text of the sourcecites [415] Srinivas-Shankar, U. et al. Effects of testosterone on muscle strength, physical function, body composition, and quality of life in intermediate-frail and frail elderly men: a randomized, double-blind, placebo-controlled study. J. Clin. Endocrinol. Metab. 95, 639–650 (2010). source
• Partly supported

  The Strength section (p. 3) reports improved handgrip strength with testosterone, and the paper reports increased lean body mass. But knee strength did not differ significantly from placebo; the paper does not report improvements in leg-press or chest-press exercises. (LLM, conf=0.90)

  cites [416] Page, S. T. et al. Exogenous testosterone (T) alone or with finasteride increases physical performance, grip strength, and lean body mass in older men with low serum T. J. Clin. Endocrinol. Metab. 90, 1502–1510 (2005). sourceExperimental — accuracy not yet measured

In the paper

“Improvements in lean mass do not directly result in improved function after testosterone therapy409.”

What the sources say

• Partly supported

  The Discussion reports that large lean-mass gains at week 8 were not accompanied by large improvements in muscle function, supporting the point that the gains did not immediately translate into functional improvement. But it also reports more substantial strength and muscle-performance gains by week 17, so the claim is too broad without a timing qualifier. (LLM, conf=0.85)

  cites [409] Schroeder, E. T. et al. Value of measuring muscle performance to assess changes in lean mass with testosterone and growth hormone supplementation. Eur. J. Appl. Physiol. 112, 1123–1131 (2012). sourceExperimental — accuracy not yet measured

In the paper

“Orlistat promotes the weight loss via fat and visceral adipose tissue loss but minimally changes lean mass389–391.”

What the sources say

• Partly supported

  The Results (Body composition measurements, Table II; page unavailable) report weight and total-fat loss with orlistat. They do not report lean-mass changes, and orlistat's absolute android fat change was small; the Methods describe regional fat measurements rather than a direct measurement of visceral adipose tissue. Thus, this paper supports weight and fat loss, but not the specific claims of visceral adipose tissue loss and minimal lean-mass change. (LLM, conf=0.88)

  cites [389] Kujawska-Luczak, M. et al. The effect of orlistat versus metformin on body composition and insulin resistance in obese premenopausal women: 3-month randomized prospective open-label study. Arch. Med. Sci. 13, 725–731 (2017). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [390] Smith, S. R. et al. Orlistat 60 mg reduces visceral adipose tissue: a 24-week randomized, placebo-controlled, multicenter trial. Obesity (Silver Spring) 19, 1796–1803 (2011). source
• ?Not checked — no full text of the sourcecites [391] Smith, T. J. et al. Efficacy of orlistat 60 mg on weight loss and body fat mass in US Army soldiers. J. Acad. Nutr. Diet. 112, 533–540 (2012). source

In the paper

“There are conflicting data on the effect of testosterone supplementation on muscle strength and function50,51,357,414.”

What the sources say

• ?Not checked — no full text of the sourcecites [50] Urban, R. J. et al. Testosterone administration to elderly men increases skeletal muscle strength and protein synthesis. Am. J. Physiol. 269, E820–E826 (1995). source
• ?Not checked — no full text of the sourcecites [51] Snyder, P. J. et al. Effect of testosterone treatment on body composition and muscle strength in men over 65 years of age. J. Clin. Endocrinol. Metab. 84, 2647–2653 (1999). source
• Supported

  The paper describes mixed findings in older men: the Abstract says most studies found little or no effect on strength or physical function, while the Muscle strength and power section reports an upper-body strength benefit from testosterone alone. The Body composition section also says favorable changes have not reliably translated into strength or functional gains. (LLM, conf=0.89)

  cites [357] Hildreth, K. L. et al. Effects of testosterone and progressive resistance exercise in healthy, highly functioning older men with low-normal testosterone levels. J. Clin. Endocrinol. Metab. 98, 1891–1900 (2013). source
• ?Not checked — no full text of the sourcecites [414] Bhasin, S. et al. Older men are as responsive as young men to the anabolic effects of graded doses of testosterone on the skeletal muscle. J. Clin. Endocrinol. Metab. 90, 678–688 (2005). This is a randomized trial of dose-dependent testosterone supplementation that demonstrates that older men are as responsive as young men to the anabolic effects of testosterone; however, older men have lower testosterone clearance rates, higher increments in haemoglobin and a higher frequency of adverse effects. source

In the paper

“In select older men over the age of 60 years with testosterone deficiency and frailty, body composition and quality of life improved following supplementation with testosterone409–411.”

What the sources say

• Partly supported

  The Results (‘Changes in body composition’; page not provided) report increased lean mass in older men receiving testosterone, supporting the body-composition portion. The Methods (‘Study participants’; page not provided) specify men aged 65–90 with testosterone in the lower portion of the adult range, but do not establish that they were frail or testosterone-deficient. The paper does not report an improvement in quality of life. (LLM, conf=0.88)

  cites [409] Schroeder, E. T. et al. Value of measuring muscle performance to assess changes in lean mass with testosterone and growth hormone supplementation. Eur. J. Appl. Physiol. 112, 1123–1131 (2012). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [410] Hyde, Z. et al. Low free testosterone predicts frailty in older men: the health in men study. J. Clin. Endocrinol. Metab. 95, 3165–3172 (2010). source
• Partly supported

  The Discussion (page unavailable in our copy) says testosterone administration is associated with increased skeletal muscle mass, supporting the body-composition part of the claim. It does not report improved quality of life after supplementation in men over 60 with both testosterone deficiency and frailty; it notes that most earlier trials enrolled healthy older men without functional limitations. (LLM, conf=0.86)

  cites [411] Krasnoff, J. B. et al. Free testosterone levels are associated with mobility limitation and physical performance in community-dwelling men: the Framingham Offspring Study. J. Clin. Endocrinol. Metab. 95, 2790–2799 (2010). sourceExperimental — accuracy not yet measured

In the paper

“To date, the American Association of Clinical Endocrinologists187, the Endocrine Society425 and the Obesity Society186 have not recommended testosterone supplementation as a treatment for sarcopenia or obesity.”

What the sources say

• ?Not checked — no full text of the sourcecites [187] Garvey, W. T. et al. American Association of Clinical Endocrinologists and American College of Endocrinology comprehensive clinical practice guidelines for medical care of patients with obesity. Endocr. Pract. 22 (Suppl. 3), 1–203 (2016). Guidelines for the management of obesity by the AACE/ACE. source
• ?Not checked — no full text of the sourcecites [425] Bhasin, S. et al. Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline. J. Clin. Endocrinol. Metab. 95, 2536–2559 (2010). source
• ?Could not verify

  The Treatment options and Pharmacotherapy sections discuss obesity treatments, and the Future Research Directions section discusses sarcopenic obesity. None states whether the Obesity Society recommends testosterone supplementation for sarcopenia or obesity. A treatment list that omits testosterone does not establish the claimed non-recommendation. (LLM, conf=0.72)

  cites [186] Villareal, D. T. et al. Obesity in older adults: technical review and position statement of the American Society for Nutrition and NAASO, The Obesity Society. Am. J. Clin. Nutr. 82, 923–934 (2005). This study highlights current guidelines for the management of older adults with obesity. sourceExperimental — accuracy not yet measured

In the paper

“SARMs indirectly affect nonmuscle androgen receptor pathways mediated by muscle fibroblasts426.”

What the sources say

• Partly supported

  The Introduction describes SARMs as tissue-selective androgen receptor ligands and says non-genomic pathways may play a role in their action. It does not establish that SARMs indirectly affect nonmuscle androgen receptor pathways through muscle fibroblasts; the Introduction instead treats indirect androgen action through other cells as an open question. (LLM, conf=0.82)

  cites [426] Dubois, V., Laurent, M., Boonen, S., Vanderschueren, D. & Claessens, F. Androgens and skeletal muscle: cellular and molecular action mechanisms underlying the anabolic actions. Cell. Mol. Life Sci. 69, 1651–1667 (2012). sourceExperimental — accuracy not yet measured

In the paper

“Enobosarm significantly increased lean mass compared with baseline (1.0 kg, 95% CI −4.8 to 11.5; P = 0.046) versus controls (0.02 kg, 95% CI −5.8 to 6.7; P = 0.88).”

What the sources say

• Partly supported

  The Results (Table 2; page unavailable) support an increase in lean body mass with enobosarm, but not the quoted estimates, confidence intervals, or P values. The 3-mg group gained 1.246 kg from baseline, versus a 0.073-kg decrease with placebo; the reported P value for the treatment-versus-placebo comparison is <0.001. (LLM, conf=0.88)

  cites [429] Dalton, J. T. et al. The selective androgen receptor modulator GTx-024 (enobosarm) improves lean body mass and physical function in healthy elderly men and postmenopausal women: results of a double-blind, placebo-controlled phase II trial. J. Cachexia Sarcopenia Muscle 2, 153–161 (2011). sourceExperimental — accuracy not yet measured

In the paper

“An early human study suggests a role for mesenchymal stem cells in managing frailty468.”

What the sources say

• Supported

  The paper’s Abstract Conclusion reports that intravenous allogeneic human mesenchymal stem cells were safe in people with aging frailty and that treated groups improved on physical-performance and inflammatory measures. It calls for larger trials to establish efficacy, consistent with the citing sentence’s cautious wording. (LLM, conf=0.93)

  cites [468] Tompkins, B. A. et al. Allogeneic mesenchymal stem cells ameliorate aging frailty: a phase ii randomized, double-blind, placebo-controlled clinical trial. J. Gerontol. A Biol. Sci. Med. Sci. 72, 1513–1522 (2017). source

In the paper

“Its deficiency has been associated with increased risk of fragility fractures452–455, particularly in patients who are malnourished456,457.”

What the sources say

• ?Not checked — no full text of the sourcecites [452] Hart, J. P. et al. Electrochemical detection of depressed circulating levels of vitamin K1 in osteoporosis. J. Clin. Endocrinol. Metab. 60, 1268–1269 (1985). source
• ?Not checked — no full text of the sourcecites [453] Bitensky, L. et al. Circulating vitamin K levels in patients with fractures. J. Bone Joint Surg. Br. 70, 663–664 (1988). source
• ?Not checked — no full text of the sourcecites [454] Hodges, S. J., Akesson, K., Vergnaud, P., Obrant, K. & Delmas, P. D. Circulating levels of vitamins K1 and K2 decreased in elderly women with hip fracture. J. Bone Miner. Res. 8, 1241–1245 (1993). source
• ?Not checked — no full text of the sourcecites [455] Hodges, S. J. et al. Depressed levels of circulating menaquinones in patients with osteoporotic fractures of the spine and femoral neck. Bone 12, 387–389 (1991). source
• Partly supported

  The Introduction and Discussion report associations between low vitamin K status and increased hip fracture risk. But the Discussion (p. 989) does not establish a stronger association specifically in malnourished patients; it suggests that general undernutrition or frailty, rather than vitamin K inadequacy itself, may explain the observed fracture risk. The study did not evaluate fractures as an endpoint. (LLM, conf=0.84)

  cites [456] Binkley, N. et al. Vitamin K treatment reduces undercarboxylated osteocalcin but does not alter bone turnover, density, or geometry in healthy postmenopausal North American women. J. Bone Miner. Res. 24, 983–991 (2009). sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [457] Binkley, N. C. & Suttie, J. W. Vitamin K nutrition and osteoporosis. J. Nutr. 125, 1812–1821 (1995). source