Cited by 88Nutrition and Health in AgingBody Composition Measurement TechniquesMuscle Physiology and Disorders

The role of obesity in sarcopenia and the optimal body composition to prevent against sarcopenia and obesity

Open access
Liu, Chaoran, Cheng, Keith Yu-Kin, Tong, Xin, Cheung, Wing-Hoi, Chow, Simon Kwoon-Ho, Law, Sheung Wai, Wong, Ronald Man Yeung·2023·Frontiers in Endocrinology

Abstract

Background: Elderly people with low lean and high fat mass, are diagnosed with sarcopenic obesity (SO), and often have poor clinical outcomes. This study aimed to explore the relationship between obesity and sarcopenia, and the optimal proportion of fat and muscle for old individuals. Methods: Participants aged 60 years or above were instructed to perform bioelectrical impedance analysis to obtain the muscle and fat indicators, and handgrip strength was also performed. Sarcopenia was diagnosed according to predicted appendicular skeletal muscle mass and function. Body mass index (BMI) and body fat percentage (BF%) were used to define obesity. The association of muscle and fat indicators were analyzed by Pearson’s correlation coefficient. Pearson Chi-Square test was utilized to estimate odds ratios (OR) and 95% confidence intervals (CI) on the risk of sarcopenia according to obesity status. Results: 1637 old subjects (74.8 ± 7.8 years) participated in this study. Not only fat mass, but also muscle indicators were positively correlated to BMI and body weight (p < 0.05). Absolute muscle and fat mass in different positions had positive associations (p < 0.05). Muscle mass and strength were negatively related to appendicular fat mass percentage (p < 0.05). When defined by BMI (OR = 0.69, 95% CI [0.56, 0.86]; p = 0.001), obesity was a protective factor for sarcopenia, whilst it was a risk factor when using BF% (OR = 1.38, 95% CI [1.13, 1.69]; p = 0.002) as the definition. The risk of sarcopenia reduced with the increase of BMI in both genders. It was increased with raised BF% in males but displayed a U-shaped curve for females. BF% 26.0–34.6% in old females and lower than 23.9% in old males are recommended for sarcopenia and obesity prevention. Conclusion: Skeletal muscle mass had strong positive relationship with absolute fat mass but negative associations with the percentage of appendicular fat mass. Obesity was a risk factor of sarcopenia when defined by BF% instead of BMI. The management of BF% can accurately help elderly people prevent against both sarcopenia and obesity.

AI snapshot

Written from the paper’s full text.

TL;DR

In a cross-sectional study of 1,637 Chinese adults aged ≥60 years, obesity was protective against sarcopenia when defined by BMI but a risk factor when defined by body fat percentage (BF%). The authors recommend maintaining BF% 26.0–34.6% in older females and <23.9% in older males to prevent both sarcopenia and obesity.

Key findings

  • Among 1,637 participants (74.8 ± 7.8 years; 83.6% female), BMI-defined obesity was associated with lower sarcopenia risk (total OR = 0.69, 95% CI [0.56, 0.86]; p = 0.001), while BF%-defined obesity was associated with higher risk (total OR = 1.38, 95% CI [1.13, 1.69]; p = 0.002).
  • Sarcopenic obesity prevalence was higher when obesity was defined by BF% (25% in males, 17.3% in females, 18.6% total) than by BMI ≥25 kg/m² (14.2% in males, 11.8% in females, 12.2% total).
  • Muscle mass and strength were positively correlated with BMI and absolute fat mass, but negatively related to appendicular fat mass percentage (p < 0.05); trunk fat mass percentage was negatively related to handgrip strength only in males.
  • Recommended BF% ranges to minimize sarcopenia risk were 26.0–34.6% in older females and <23.9% in older males; BMI <18.5 kg/m² increased sarcopenia risk in females, and BMI 25–29.5 kg/m² was protective in males (p = 0.02).

Methods

  • Cross-sectional study of community-dwelling or outpatient Chinese adults aged ≥60 years recruited at Prince of Wales Hospital, Hong Kong, from 2019 to 2021; exclusions included severe foot deformity preventing BIA and inability to communicate/understand instructions.
  • Body composition was assessed by bioelectrical impedance analysis (InBody 120), with appendicular skeletal muscle mass index (ASMI) predicted from BIA-derived skeletal muscle mass index and demographics; handgrip strength was measured by dynamometer. Sarcopenia was defined by AWGS 2019 cut-offs (ASMI <7.0 kg/m² and HGS <28 kg in males; ASMI <5.4 kg/m² and HGS <18 kg in females). Obesity was defined as BMI ≥25 kg/m² or BF% >27% in males and >35% in females.
  • Analyses included Pearson correlation, one-way ANOVA with Bonferroni post-hoc tests, Pearson Chi-square for odds ratios, and linear regression for annual decline rates of ASMI and HGS.

Limitations

  • Stated: sarcopenia was diagnosed using only ASMI and HGS without physical performance measures such as 6-metre walk, SPPB, or 5-time chair stand test; ASMI was estimated by a prediction model, which may introduce error; the male sample was smaller, possibly causing false-negative results; blood samples and comorbidity information were not collected; and the cross-sectional design shows relative risk rather than causality.
  • Evident from the text: the study population was recruited from a single Hong Kong hospital/community setting and was predominantly female (83.6%), which may limit generalizability to other populations or to males.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.3389/fendo.2023.1077255

Cites

43 of 43 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 34 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    In males, the odds ratio for sarcopenia was linearly raised over BF% 23.8%.

    “BF% and the risk of sarcopenia displayed a U-shaped curve in female, but the OR was lineally raised in male over 23.8% ( Figure 4B ).”
    Quote in the paperSubstantial claim
  • Findingown data

    Other indicators in male without obesity declined more than male with obesity.

    “Other indicators in male without obesity declined more than male with obesity.”
    Quote in the paperNot a substantial claim
  • Findingown data

    BMI- and BF%-defined obesity had opposite roles in sarcopenia.

    “BMI- and BF% defined obesity had opposite roles in sarcopenia.”
    Quote in the paperSubstantial claim
  • Findingown data

    In females, BF% 26.0-30.9% and 31.0-34.6% groups had significant protective effects against sarcopenia compared to the lowest BF% group (p < 0.05).

    “The significant protective effects were found in BF% 26.0–30.9% and 31.0–34.6% groups compared to the lowest BF% group in female (p < 0.05).”
    Quote in the paperSubstantial claim
  • Findingown data

    When defined by BMI, obesity was a protective factor for sarcopenia (OR = 0.69, 95% CI [0.56, 0.86]; p = 0.001).

    “When defined by BMI (OR = 0.69, 95% CI [0.56, 0.86]; p = 0.001), obesity was a protective factor for sarcopenia”
    Quote in the paperSubstantial claim
  • May combine two claims. 36
  • Classified as probably not a substantial claim. 11
  • May combine two claims.

    Findingown data

    SMM in both genders was negatively related to percentage of appendicular fat mass (p < 0.05), but positively associated with BF% in females.

    “SMM in both genders was negatively related to percentage of appendicular fat mass (p < 0.05), but positively associated with BF% in females.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In males, the risk of sarcopenia was comparable in the first four BF% groups, but significantly higher in the fifth group with BF% > 31.5 (p < 0.01).

    “Nevertheless, the risk of sarcopenia was comparable in the first four BF% groups, but significantly higher in the fifth group with BF% > 31.5 (p < 0.01) in male.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Higher fat mass percentage in whole and partial body, fat mass index, and lower weight, height, fat-free mass in partial body, percentage of FFM, SMM, SMI, ASMI, and handgrip strength were related to increased age (p < 0.05).

    “Higher fat mass percentage in the whole and partial body, fat mass index, and lower weight, height, fat-free mass (FFM) in partial body, percentage of FFM, SMM, SMI, ASMI, and handgrip strength were related to increased age (p < 0.05).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    TFM% was positively related to SMI (p < 0.001), but not ASMI (p > 0.05).

    “TFM% was positively related to SMI (p < 0.001), but not ASMI (p > 0.05).”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    WHR was similar or higher in the healthy group compared to only sarcopenic group, as well as in only obese group compared to sarcopenic obesity group.

    “WHR was similar or higher in the healthy group compared to only sarcopenic group, as well as in only obese group compared to sarcopenic obesity group.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Although BFM was similar between obese status-matched sarcopenic and non-sarcopenic groups, lower SMM was shown in the former groups.

    “Although BFM was similar between obese status-matched sarcopenic and non-sarcopenic groups, lower SMM was shown in the former groups ( Figures 1B, C ).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In females, SMI increased with higher LFM%, and HGS increased with higher WHR, which were not found in males.

    “In females, SMI increased with higher LFM%, and HGS increased with higher WHR, which were not found in males.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    The risk of sarcopenia increased with raised BF% in males but displayed a U-shaped curve for females.

    “It was increased with raised BF% in males but displayed a U-shaped curve for females.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Higher TFM% was related to lower HGS in males, but to higher ASMI and SMI in females.

    “We found higher TFM% was related to lower HGS in males, but to higher ASMI and SMI in females.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    When the population without obesity was regarded as the reference group (OR = 1.00), obesity defined by BMI was a protective factor of sarcopenia in both male and female (ORs < 1.00, p < 0.05), while BF%-defined obesity was a risk factor (ORs > 1.00, p < 0.05).

    “When the population without obesity was regarded as the reference group (OR = 1.00), obesity defined by BMI was a protective factor of sarcopenia in both male and female (ORs < 1.00, p < 0.05), while BF%-defined obesity was a risk factor (ORs > 1.00, p < 0.05).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Appendicular fat mass was comparable or lower in sarcopenic groups with matched obesity status, but significantly higher when demonstrated by percentage.

    “Appendicular fat mass was comparable or lower in sarcopenic groups with matched obesity status, but significantly higher when demonstrated by percentage.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    BF% was weakly and negatively related to SMM and ASMI, but positively related to SMI (p < 0.05).

    “BF% was weakly and negatively related to SMM and ASMI, but positively related to SMI (p < 0.05).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In males, SMI and WHR reduced with advanced age, which were not significant in females.

    “In males, SMI and WHR reduced with advanced age, which were not significant in females.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    ASMI was inversely related to AFM% but not LFM% in both genders.

    “ASMI was inversely related to AFM% but not LFM% in both genders.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Similar trends were also found in BF%-defined females with obesity, with the regression coefficient (β: -0.013 vs. -0.004) in ASMI, and in HGS (β: -0.253 vs. -0.189).

    “Similar trends were also found in BF%-defined females with obesity, with the regression coefficient (β: -0.013 vs. -0.004) in ASMI, and in HGS (β: -0.253 vs. -0.189).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    With similar ASMI, BMI-defined SO had remarkedly higher BF% and lower HGS than the normal group (p < 0.05).

    “With similar ASMI, BMI-defined SO had remarkedly higher BF% and lower HGS than the normal group (p < 0.05).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingnone given

    Patients with sarcopenia have similar or even lower levels of absolute fat mass compared to non-sarcopenic people, but their relative fat mass increased especially in limbs.

    “Although patients with sarcopenia have similar or even lower levels of absolute fat mass compared to non-sarcopenic people, their relative fat mass increased especially in limbs.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Fat mass percentage in the trunk was similar between individuals with sarcopenia and non-sarcopenia when compared within the people with or without obesity, respectively (p > 0.05), except for males defined with obesity by BMI.

    “Fat mass percentage in the trunk was similar between individuals with sarcopenia and non-sarcopenia when compared within the people with or without obesity, respectively (p > 0.05), except for males defined with obesity by BMI.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    In females with obesity, the annual rate of muscle mass and strength decline was faster than the non-obese group, but this finding did not present in males.

    “In females with obesity, the annual rate of muscle mass and strength decline was faster than the non-obese group, but this finding did not present in males.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Pre-clinical studies indicate that adipose tissue damages muscle homeostasis, resulting in muscle atrophy and reduced regeneration capacity, regarded as the pathogenic mechanism of sarcopenic obesity.

    “There has been evidence from pre-clinical studies indicating that adipose tissue damages muscle homeostasis, resulting in muscle atrophy and regeneration capacity reduction (16, 17). This finding was regarded as the pathogenic mechanism of sarcopenic obesity (17).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [16] Messa, 2020, The impact of a high-fat diet in mice is dependent on duration and age, and differs between muscles, J Exp Biol source

      Not checked in the free run.

    • cites [17] Batsis, 2018, Sarcopenic obesity in older adults: Aetiology, epidemiology and treatment strategies, Nat Rev Endocrinol source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Old individuals with both low muscle mass and high adiposity are sarcopenic obese and have higher risk of all-cause mortality, failing to benefit from the obesity paradox.

    “Old individuals with both low muscle mass and high adiposity are sarcopenic obese (SO) which fail to benefit from the “obesity paradox” due to their higher risk of all-cause mortality (15).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [15] Zhang, 2019, Association of sarcopenic obesity with the risk of all-cause mortality among adults over a broad range of different settings: A updated meta-analysis, BMC Geriatr source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The Asian Working Group for Sarcopenia (AWGS) 2019 consensus recommends using lower muscle mass with poorer grip strength or physical performance to define sarcopenia.

    “The Asian Working Group for Sarcopenia (AWGS) 2019 consensus recommends using lower muscle mass with poorer grip strength or physical performance to define sarcopenia (10).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [10] Chen, 2020, Asian Working group for sarcopenia: 2019 consensus update on sarcopenia diagnosis and treatment, J Am Med Dir Assoc source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Sarcopenia is an age-related muscle disorder associated with increased risk of fall, fracture, and mortality.

    “Sarcopenia is an age-related muscle disorder, and is associated with increased risk of fall, fracture, and mortality (8, 9).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [8] Yeung, 2019, Sarcopenia and its association with falls and fractures in older adults: A systematic review and meta-analysis, J Cachexia Sarcopenia Muscle source

      Not checked in the free run.

    • cites [9] Liu, 2017, Sarcopenia as a predictor of all-cause mortality among community-dwelling older people: A systematic review and meta-analysis, Maturitas source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    BMI only considers body mass rather than body composition, which may not be appropriate for old individuals.

    “It is well known that BMI only considers body mass rather than body composition, which may not be appropriate for old individuals (2)”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [2] Lv, 2022, The obesity paradox is mostly driven by decreased noncardiovascular disease mortality in the oldest old in China: A 20-year prospective cohort study, Nat Aging source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Excess body fat increases all-cause and disease-cause mortality, and low lean mass is associated with higher death rates.

    “Body composition analyses have also reported that excess body fat increases all-cause and disease-cause mortality, and people with low lean mass have been found to have higher death rates (4, 5).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [4] Lee, 2018, Predicted lean body mass, fat mass, and all cause and cause specific mortality in men: Prospective us cohort study, BMJ source

      Not checked in the free run.

    • cites [5] Winter, 2014, Bmi and all-cause mortality in older adults: A meta-analysis, Am J Clin Nutr source

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationown data

    BF% 26.0-34.6% in old females and lower than 23.9% in old males are recommended for sarcopenia and obesity prevention.

    “BF% 26.0–34.6% in old females and lower than 23.9% in old males are recommended for sarcopenia and obesity prevention.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The observed associations between BF% and sarcopenia are causal, such that managing BF% can prevent sarcopenia and obesity.
  • Classified as probably not a substantial claim.

    Premisecitation

    Increased body mass index (BMI) is associated with lower all-cause and non-cardiovascular disease mortality in Chinese old people.

    “A recent cohort study indicated that increased body mass index (BMI) was associated with lower all-cause and non-cardiovascular disease mortality in Chinese old people (2).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [2] Lv, 2022, The obesity paradox is mostly driven by decreased noncardiovascular disease mortality in the oldest old in China: A 20-year prospective cohort study, Nat Aging source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Although they had larger muscle storage, the muscle regeneration may be impaired.

    “Although they had larger muscle storage, the muscle regeneration may be impaired (17).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [17] Batsis, 2018, Sarcopenic obesity in older adults: Aetiology, epidemiology and treatment strategies, Nat Rev Endocrinol source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Individuals with SO had lower muscle mass, strength, and higher adiposity, as well as higher all-cause mortality and worse surgical prognosis.

    “Individuals with SO had lower muscle mass, strength, and higher adiposity, as well as higher all-cause mortality and worse surgical prognosis (17, 32).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [17] Batsis, 2018, Sarcopenic obesity in older adults: Aetiology, epidemiology and treatment strategies, Nat Rev Endocrinol source

      Not checked in the free run.

    • cites [32] Rossi, 2020, Worsening disability and hospitalization risk in sarcopenic obese and dynapenic abdominal obese: A 5.5 years follow-up study in elderly men and women, Front Endocrinol (Lausanne) source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    The ratio of body fat was not only associated with metabolic syndromes and adverse events but also with sarcopenia.

    “The ratio of body fat was not only associated with metabolic syndromes and adverse events but also with sarcopenia (36, 37).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [36] Goossens, 2017, The metabolic phenotype in obesity: Fat mass, body fat distribution, and adipose tissue function, Obes Facts source

      Not checked in the free run.

    • cites [37] Batsis, 2016, Diagnostic accuracy of body mass index to identify obesity in older adults: Nhanes 1999-2004, Int J Obes (Lond) source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    In a large cohort of men, increment of fat mass was associated with mortality, which may be associated with the high prevalence of sarcopenia.

    “In a large cohort of men, increment of fat mass was associated with mortality, which may be associated with the high prevalence of sarcopenia (4).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [4] Lee, 2018, Predicted lean body mass, fat mass, and all cause and cause specific mortality in men: Prospective us cohort study, BMJ source

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationreasoning

    BF% contains the information of lean mass, fat mass, sarcopenia, and obesity, which is better than BMI that only contains body mass for elderly people.

    “BF% contains the information of lean mass, fat mass, sarcopenia, and obesity, which is better than BMI that only contains body mass for elderly people.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Without a large change of body composition, the increase of BMI is usually accompanied with both fat and muscle mass in adults.
  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductreasoning

    This was a cross-sectional study which only showed the relative risk instead of revealing the causal relationship between obesity and sarcopenia.

    “This was a cross-sectional study which only showed the relative risk instead of revealing the causal relationship between obesity and sarcopenia, and thus prospective studies are warranted.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Study design and conductreasoning

    We diagnosed sarcopenia based on the AWGS 2019 consensus with only ASMI and HGS.

    “We diagnosed sarcopenia based on the AWGS 2019 consensus with only ASMI and HGS.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The EWGSOP2 consensus only requires ASMI and HGS for diagnosis, and the addition of physical performance defines severity.
  • May combine two claims.

    Premisecitation

    Although with higher BMI and absolute muscle mass than sarcopenia alone, SO patients had lower muscle quality, high risk of physical disability, as well as more metabolic issues, which may induce poor clinical outcomes.

    “Although with higher BMI and absolute muscle mass than sarcopenia alone, SO patients had lower muscle quality, high risk of physical disability, as well as more metabolic issues, which may induce poor clinical outcomes (33).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [33] Roh, 2020, Health consequences of sarcopenic obesity: A narrative review, Front Endocrinol (Lausanne) source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Reduction of estradiol concentrations attenuated satellite cell proliferation, and the ability to maintain muscle mass and strength.

    “It was reported that reduction of estradiol concentrations attenuated satellite cell proliferation, and the ability to maintain muscle mass and strength (43).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [43] Geraci, 2021, Sarcopenia and menopause: The role of estradiol, Front Endocrinol (Lausanne) source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    The blood samples as well as comorbidity information were not collected for further analyses.

    “The blood samples as well as comorbidity information were not collected for further analyses.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Study design and conductown data

    This study exhibited the correlation between various muscle and fat indicators comprehensively.

    “This study exhibited the correlation between various muscle and fat indicators comprehensively.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The sample size of male participants was smaller which may cause the false-negative results.

    “The sample size of male participants was smaller which may cause the false-negative results.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    We used a prediction model to estimate ASMI, so that an error from the true value may be present.

    “In addition, we used a prediction model to estimate ASMI, so that an error from the true value may be present.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Pre-clinical studies reported that obesity impaired muscle glucose tolerance, imbalanced protein synthesis and degradation, and oxidative stress which ultimately led to muscle atrophy, especially in old animals.

    “On the contrary, pre-clinical studies reported that obesity impaired muscle glucose tolerance, imbalanced protein synthesis and degradation, and oxidative stress which ultimately led to muscle atrophy, especially in old animals (16, 17).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [16] Messa, 2020, The impact of a high-fat diet in mice is dependent on duration and age, and differs between muscles, J Exp Biol source

      Not checked in the free run.

    • cites [17] Batsis, 2018, Sarcopenic obesity in older adults: Aetiology, epidemiology and treatment strategies, Nat Rev Endocrinol source

      Not checked in the free run.

  • May combine two claims.

    Interpretationown data

    AFM% and LFM% may be biomarkers of SO.

    “AFM% and LFM% were significantly higher in SO and may be biomarkers of this disease.”
    Quote in the paperSubstantial claim
42 of 42
  • The paper relies on this without support.

    The observed associations between BF% and sarcopenia are causal, such that managing BF% can prevent sarcopenia and obesity.

    “The management of BF% can accurately help elderly people prevent against both sarcopenia and obesity.”
  • The paper relies on this without support.

    The study sample of Hong Kong Chinese elderly is representative of Asian elderly people.

    “This cross-sectional study aims to explore i) the relationship between fat and muscle indicators in Asian elderly people”
    “Elderly people were screened from the community or outpatient clinics at Prince of Wales Hospital in Hong Kong from 2019 to 2021.”
    “The inclusion criteria were 1) aged 60 years old or above, and 2) Chinese ethnicity.”
  • The paper relies on this without support.

    Without a large change of body composition, the increase of BMI is usually accompanied with both fat and muscle mass in adults.

    “Without a large change of body composition, the increase of BMI is usually accompanied with both fat and muscle mass in adults.”
  • The paper relies on this without support.

    Adipose tissue is an essential endocrine organ that regulates hormonal levels.

    “Adipose tissue is an essential endocrine organ that regulates hormonal levels.”
  • The paper relies on this without support.

    The EWGSOP2 consensus only requires ASMI and HGS for diagnosis, and the addition of physical performance defines severity.

    “This is due to the fact that the EWGSOP2 consensus only requires these two parameters for diagnosis, and the addition of physical performance defines severity.”
5 of 5

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The current definition of SO may not include adults exhibiting early signs of risk factors for SO, potentially delaying therapeutic or preventive interventions.

    “Specifically, the current definition of SO may not include adults exhibiting early signs of risk factors for SO, potentially delaying therapeutic or preventive interventions [19, 20, 21, 22].”

    From Sarcopenic Obesity Phenotype Index (SOP <i>i</i> ): A Population‐Based Study (2025) · cites this paper as [21]

    The Results (page unavailable) report that defining obesity by body-fat percentage identifies more older adults with sarcopenic obesity than defining it by BMI, and the Discussion calls for standard diagnostic criteria. The paper does not establish that current definitions exclude adults with early risk signs or that this delays therapeutic or preventive intervention. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • This promotes metabolic complications and inhibits the anabolic actions of IGF-1, which have an effect on the musculoskeletal system.

    “This promotes metabolic complications and inhibits the anabolic actions of insulin‐like growth factor IGF‐1, which have an effect on the musculoskeletal system [1, 21].”

    From Sarcopenic Obesity Phenotype Index (SOP <i>i</i> ): A Population‐Based Study (2025) · cites this paper as [21]

    The Discussion (page unavailable) links central obesity to metabolic complications and describes adverse effects of excess fat on muscle. It does not say that obesity inhibits the anabolic actions of IGF-1; IGF-1 appears only in the title of a cited study about its association with muscle strength. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • The pathogenesis of SO, while not fully elucidated, involves elevated adipose deposits leading to the expression of antimyogenic adipokines and pro-inflammatory responses that accelerate muscle function and/or mass loss.

    “The pathogenesis of SO, while not fully elucidated, involves elevated adipose deposits leading to the expression of antimyogenic adipokines and pro‐inflammatory responses that accelerate muscle function and/or mass loss.”

    From Sarcopenic Obesity Phenotype Index (SOP <i>i</i> ): A Population‐Based Study (2025) · cites this paper as [21]

    The Discussion (page unavailable) says fat deposition may contribute to muscle loss and dysfunction through adipokines and cytokines, supporting the proposed link. It does not characterize those signals as antimyogenic or pro-inflammatory, and presents the mechanism as possible rather than established. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Male BMI interval has two different upper limits

    Minor

    The BMI categories used for this analysis specify 25-29.9, but the reported significant male group is called 25-29.5. Those limits classify BMI values from 29.6 through 29.9 differently.

  • BMI-defined sarcopenic obesity is not similar to normal status in female ASMI

    Minor

    The statement about similar ASMI holds for males, but Table 1 assigns the female normal and BMI-defined sarcopenic-obesity groups different significance letters (4.8a versus 5.0d). The table note says groups with different letters differ significantly.

2 of 2

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. 2000, The Asia-pacific perspective: Redefining obesity and its treatment

Cited by

Sorted by citations

Authors
Liu, C., Cheng, K. Y.-K., Tong, X., Cheung, W.-H., Chow, S. K.-H., Law, S. W., & Wong, R. M. Y.
Affiliations
Chinese University of Hong Kong (HK)
Corresponding author
Wong, Ronald Man Yeung
Venue
Frontiers in Endocrinology
Published
2023-03-01
Volume
14
Pages
1077255-1077255
ISSN
1664-2392 (ISSN-L)
OpenAlex
W4323309635
Cited by
88
References
43
Citations by year
2026: 20 · 2025: 33 · 2024: 28 · 2023: 7
FWCI
15.63
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Endocrinology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
  • Health Sciences › Medicine › Physiology › Body Composition Measurement Techniques
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
sarcopenic obesity, sarcopenia, obesity, body composition, body fat percentage, body mass index, appendicular skeletal muscle mass, grip strength, older adults, sarcopenia prevention
MeSH terms
Aged, Body Composition, Body Weight, Female, Humans, Male, Obesity, Body Mass Index, Hand Strength, Sarcopenia

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-09.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-09.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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