Cited by 948Diabetes, Cardiovascular Risks, and LipoproteinsDiabetes Treatment and ManagementDiabetes Management and Research

The effect of metformin and intensive lifestyle intervention on the metabolic syndrome: the Diabetes Prevention Program randomized trial

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Orchard, Trevor J., Temprosa, Marinella, Goldberg, Ronald, Haffner, Steven, Ratner, Robert, Marcovina, Santica, Fowler, Sarah, for the Diabetes Prevention Program Research Group·2005·Annals of Internal Medicine

Abstract

BACKGROUND: The metabolic syndrome is a high-risk state for diabetes and cardiovascular disease. Little is known about its prevalence and prevention in those with impaired glucose tolerance. OBJECTIVE: To determine the prevalence of the metabolic syndrome at baseline in the Diabetes Prevention Program and the effect of intensive lifestyle intervention and metformin therapy on the syndrome's incidence and resolution. DESIGN: Randomized, controlled clinical trial. SETTING: Research and community-based centers. PARTICIPANTS: Participants had impaired glucose tolerance (World Health Organization criteria plus fasting plasma glucose level >or=5.3 mmol/L [>or=95 mg/dL]) and were followed for a mean of 3.2 years after random assignment to intensive lifestyle intervention, metformin therapy, or placebo. INTERVENTIONS: Metformin, 850 mg twice daily, or intensive lifestyle intervention designed to achieve and maintain a 7% weight loss and 150 minutes of exercise per week. MEASUREMENTS: The metabolic syndrome was defined as having 3 or more characteristics (waist circumference; blood pressure; and levels of high-density lipoprotein cholesterol, triglycerides, and fasting plasma glucose) that met criteria from the National Cholesterol Education Program Adult Treatment Panel III. RESULTS: Fifty-three percent of participants (n = 1711) had the metabolic syndrome at baseline; incidence did not vary substantially by age. However, low levels of high-density lipoprotein cholesterol predominated in younger participants (age 25 to 44 years), and high blood pressure predominated in older participants (age 60 to 82 years). In life-table analyses (log-rank test), incidence of the metabolic syndrome was reduced by 41% in the lifestyle group (P < 0.001) and by 17% in the metformin group (P = 0.03) compared with placebo. Three-year cumulative incidences were 51%, 45%, and 34% in the placebo, metformin, and lifestyle groups, respectively. There was no significant heterogeneity by ethnic group. LIMITATIONS: The study involved a volunteer group with impaired glucose tolerance, which limits generalizability. CONCLUSIONS: The metabolic syndrome affected approximately half of the participants in the Diabetes Prevention Program at baseline. Both lifestyle intervention and metformin therapy reduced the development of the syndrome in the remaining participants.

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  • Metformin reduces insulin levels, inflammation and thrombosis, and the risk of metabolic syndrome, and improves insulin sensitivity, suggesting its potential to exert protective effects on cognitive function.

    “Studies showing that metformin (MET) not only reduces insulin levels (11), inflammation and thrombosis (12), and the risk of the metabolic syndrome (13), but also improves insulin sensitivity (11) suggests its potential to exert protective effects on cognitive function.”
  • In the Look AHEAD Trial, weight reduction translated into appreciable triglyceride lowering.

    “Similar results were reported in the Look AHEAD (Action for Health in Diabetes) Trial, 438 in which weight reduction also translated into appreciable triglyceride lowering.”

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  1. [12]Hokanson JE, Austin MA, Brunzell JD. Measurement and clinical significance of low density lipoprotein subclasses. In: Rifai N, Warnick GR, Dominiczak MH, editors. Handbook of Lipoprotein Testing. Washington, DC: AACC Pr; 1997. pp. 267–282. [Google Scholar]

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Authors
Orchard, T. J., Temprosa, M., Goldberg, R., Haffner, S., Ratner, R., Marcovina, S., Fowler, S., & for the Diabetes Prevention Program Research Group
Affiliations
George Washington University (US)
Venue
Annals of Internal Medicine
Published
2005-04-19
Volume
142
Issue
8
Pages
611-619
ISSN
  • 0003-4819 (ISSN-L)
  • 1539-3704
OpenAlex
W2065827854
Cited by
948
References
26
Citations by year
2026: 12 · 2025: 13 · 2024: 19 · 2023: 16 · 2022: 19 · 2021: 24 · 2020: 26 · 2019: 28 · 2018: 38 · 2017: 33 · 2016: 37 · 2015: 52 · 2014: 41 · 2013: 57 · 2012: 56
FWCI
55.98
Type
journal article
Language
en
Open access
Locations
  • Annals of Internal Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (U01DK048489)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
Keywords
metabolic syndrome, metformin, intensive lifestyle intervention, impaired glucose tolerance, type 2 diabetes prevention, prevalence, incidence, HDL cholesterol, blood pressure, weight loss, physical activity, Diabetes Prevention Program
MeSH terms
Adult, Age Factors, Aged, Aged, 80 and over, Diet, Reducing, Exercise Therapy, Humans, Hypoglycemic Agents, Life Style, Metformin, Middle Aged, Risk Factors, United States, Incidence, Metabolic Syndrome

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