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The impact of metformin on weight and metabolic parameters in patients with obesity: A systematic review and meta‐analysis of randomized controlled trials

二甲双胍 荟萃分析 随机对照试验 医学 肥胖 内科学 糖尿病 内分泌学
作者
Rachelle Haber,Fatima Zarzour,Malak Ghezzawi,Natalie Saadeh,Dania S. Bacha,Lama Al Jebbawi,Marlene Chakhtoura,Christos S. Mantzoros
出处
期刊:Diabetes, Obesity and Metabolism [Wiley]
卷期号:26 (5): 1850-1867 被引量:8
标识
DOI:10.1111/dom.15501
摘要

Abstract There are conflicting data on the weight‐reducing potential of metformin (MTF) in nondiabetic patients with obesity. The purpose of this systematic review and meta‐analysis was to evaluate the effect of MTF on weight and cardiometabolic parameters in adults with overweight/obesity with or without nonalcoholic fatty liver disease (NAFLD) (CRD42018085512). We included randomized controlled trials (RCTs) in adults without diabetes mellitus, with mean body mass index (BMI) ≥ 25 kg/m 2 , with or without NAFLD, comparing MTF to placebo/control, lifestyle modification (LSM) or a US Food and Drug Administration‐approved anti‐obesity drug, reporting on weight or metabolic parameters, and extending over at least 3 months. We conducted a systematic search in MEDLINE, EMBASE, PubMed and the Cochrane Library without time limitation (until March 2022). We screened and selected eligible articles, abstracted relevant data, and assessed the risk of bias. All steps were in duplicate and independently. We conducted a random‐effects model meta‐analysis using Review Manager version 5.3, with prespecified subgroup analyses in case of heterogeneity. We identified 2650 citations and included 49 trials (55 publications). Compared to placebo, MTF was associated with a significant reduction in BMI (mean difference [MD] −0.56 [−0.74, −0.37] kg/m 2 ; p < 0.0001), at doses ranging from 500 to 2550 mg/day, and with a significant percentage change in BMI of −2.53% (−2.90, −2.17) at the dose 1700 mg/day. There was no interaction by baseline BMI, MTF dose or duration, nor presence or absence of NAFLD. There was no significant difference between MTF and LSM. Orlistat was more effective than MTF (at doses of 1000–1700 mg/day) in terms of weight loss, with an MD in BMI of −3.17 (−5.88; −0.47) kg/m 2 , favouring the former. Compared to placebo/control, MTF improved insulin parameters, while no effect was detected when compared to LSM. A few small trials showed heterogenous effects on liver parameters in patients with NAFLD treated with MTF compared to placebo/control. There was a large variability in the expression of outcome measures and RCTs were of low quality. In conclusion, MTF was associated with a modest weight reduction in obese nondiabetic patients. Further high‐quality and better powered studies are needed to examine the impact of MTF in patients with insulin resistance and NAFLD.
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