Average Weight Loss on Semaglutide In the main clinical trial that supported semaglutide's approval for weight management (the STEP 1 trial), adults who took the 2.4 mg weekly dose lost, on average, about 15% of their body weight over 68 weeks, compared with a much smaller amount in the placebo group
But "most" is not "all," and several specific populations may find genuine value in a sub-2.5 mg entry point
(Source: ASMBS, June 2025) A 2026 network meta-analysis of randomized controlled trials (30 trials, 20,015 patients) found metabolic/bariatric surgery achieved significantly greater reductions than GLP-1 receptor agonists in total weight loss (10.3 percentage points), BMI (4.5 kg/m), body weight (11.7 kg), waist circumference (12.6 cm), and HbA1c (0.5%) at under 104 weeks
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MR-Egger intercept test and Cochrans Q statistic were utilized to assess pleiotropy and heterogeneity, respectively