Cited by 1,330Liver Disease Diagnosis and TreatmentLiver Diseases and ImmunityDiabetes, Cardiovascular Risks, and Lipoproteins

Randomized controlled trial testing the effects of weight loss on nonalcoholic steatohepatitis

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Promrat, Kittichai, Kleiner, David E., Niemeier, Heather M., Jackvony, Elizabeth, Kearns, Marie, Wands, Jack R., Fava, Joseph L., Wing, Rena R.·2010·Hepatology

Abstract

Nonalcoholic steatohepatitis (NASH) is a chronic progressive liver disease that is strongly associated with obesity. Currently, there is no approved therapy for NASH. Weight reduction is typically recommended, but efficacy data are lacking. We performed a randomized controlled trial to examine the effects of lifestyle intervention using a combination of diet, exercise, and behavior modification, with a goal of 7% to 10% weight reduction, on clinical parameters of NASH. The primary outcome measure was the change in NASH histological activity score (NAS) after 48 weeks of intervention. Thirty-one overweight or obese individuals (body mass index [BMI], 25–40 kg/m2) with biopsy-proven NASH were randomized in a 2:1 ratio to receive intensive lifestyle intervention (LS) or structured education (control). After 48 weeks of intervention, participants assigned to LS lost an average of 9.3% of their weight versus 0.2% in the control group ( P = 0.003). A higher proportion of participants in the LS group had a reduction of NAS of at least 3 points or had posttreatment NAS of 2 or less as compared with the control group (72% versus 30%, P = 0.03). NAS improved significantly in the LS group (from 4.4 to 2.0) in comparison with the control group (from 4.9 to 3.5) ( P = 0.05). Percent weight reduction correlated significantly with improvement in NAS ( r = 0.497, P = 0.007). Participants who achieved the study weight loss goal (≥7%), compared with those who lost less than 7%, had significant improvements in steatosis (−1.36 versus −0.41, P < 0.001), lobular inflammation (−0.82 versus −0.24, P = 0.03), ballooning injury (−1.27 versus −0.53, P = 0.03) and NAS (−3.45 versus −1.18, P < 0.001). Conclusion: Weight reduction achieved through lifestyle intervention leads to improvements in liver histology in NASH. (Hepatology 2009.)

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  • In people with type 2 diabetes and ABCD, improvements in A1C, blood pressure, and lipids require more than 5% weight loss and are progressive up to and exceeding 15% weight loss, whereas other common complications of ABCD, such as obstructive sleep apnea and NASH, may require more than 10% weight loss for clinical benefits.

    “In persons with T2D and ABCD, improvements in A1C, BP, and lipids require >5% weight loss and are progressive up to and exceeding 15% weight loss,678,679 whereas other common complications of ABCD, such as OSA and NASH, may require >10% weight loss for clinical benefits.680–685”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [679]

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  • Weight loss of more than 5% to at least 10% or more is needed to achieve progressive and optimal improvements in A1C, blood pressure, and lipids in people with type 2 diabetes and ABCD.

    “Weight loss of >5% to ≥10% or more is needed to achieve progressive and optimal improvements in A1C, BP, and lipids in persons with T2D and ABCD.678,679”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [679]

    The Weight Change section reports that the intervention group lost an average of 9.3% of body weight at 48 weeks, and Table 2 reports a decrease in mean HbA1c, but the between-group HbA1c difference was not significant (P = 0.52). The paper links at least 7% weight loss to improvements in NASH histology, not to progressive or optimal improvements in A1C, blood pressure, and lipids among people with type 2 diabetes and ABCD. It does not establish the claimed weight-loss threshold for those outcomes. (LLM, conf=0.85)

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  • For most people with type 2 diabetes, optimal management requires losing more than 5% and up to at least 10% of body weight to improve glycemia and address the risk, presence, and severity of ABCD cardiometabolic and biomechanical complications.

    “Weight loss >5% to ≥10% is required for optimal treatment of most persons with T2D to optimally improve glycemia and address the risk, presence, and severity of ABCD cardiometabolic and biomechanical complications.678–683”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [679]

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  • Lifestyle therapy is a foundational treatment for people with diabetes who have or are at risk for other cardiometabolic outcomes.

    “Lifestyle therapy is a foundational aspect of treatment in persons with DM who also may have or are at risk of other CMD outcomes. All persons with DM should be instructed and supported in lifestyle interventions centered around MNT.679,899–901”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [679]

    The Discussion (page unavailable) presents lifestyle intervention as an attractive therapy for NASH and notes additional benefits of weight loss for cardiovascular risk factors. The Characteristics of the Participants section (page unavailable) says 48% had type 2 diabetes. The paper does not establish that lifestyle therapy is foundational treatment for people with diabetes generally or across other cardiometabolic conditions. (LLM, conf=0.85)

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  • Multiple whole-food meal patterns improve glycemia, blood pressure, and cardiovascular risk factors in diabetes.

    “Regarding whole foods, multiple meal patterns have been shown to be advantageous for the management of DM, which promote reductions in glycemia, BP, and CVD risk factors.679,901,920–924”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [679]

    The Lifestyle Intervention section (page unavailable) describes one calorie-restricted diet combined with exercise, not multiple whole-food meal patterns. Table 2 (page unavailable) shows reduced waist circumference and numerical declines in glucose and HbA1c, but the glycemic changes did not differ significantly from controls. The trial enrolled people with nonalcoholic steatohepatitis, about half of whom had diabetes, and does not establish a blood-pressure reduction. (LLM, conf=0.86)

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Research works printed but not linked: 1

  1. [25]25. FX P-S. The Effects of Increased Physical Activity on Food Intake, Meta- bolic Rate, and Health Risks in Obese Individuals. New York: The Guil- ford Press, 1992:190-210.

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Authors
Promrat, K., Kleiner, D. E., Niemeier, H. M., Jackvony, E., Kearns, M., Wands, J. R., Fava, J. L., & Wing, R. R.
Affiliations
  • Brown University (US)
  • National Institutes of Health (US)
  • University of Wisconsin–Whitewater (US)
Corresponding author
Promrat, Kittichai
Venue
Hepatology
Published
2010-01
Volume
51
Issue
1
Pages
121-129
ISSN
0270-9139 (ISSN-L)
OpenAlex
W1997425045
Cited by
1,330
References
43
Citations by year
2026: 47 · 2025: 62 · 2024: 68 · 2023: 102 · 2022: 96 · 2021: 113 · 2020: 95 · 2019: 79 · 2018: 76 · 2017: 93 · 2016: 95 · 2015: 93 · 2014: 94 · 2013: 65 · 2012: 66
FWCI
33.34
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Cancer Institute
  • National Institute of Diabetes and Digestive and Kidney Diseases (5R03DK67263-2, R03DK067263)
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
nonalcoholic steatohepatitis, weight loss, lifestyle intervention, obesity, steatosis, lobular inflammation, diet and exercise, behavior modification, liver histopathology
MeSH terms
Adult, Fatty Liver, Female, Humans, Life Style, Liver, Male, Middle Aged, Obesity, Weight Loss

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