Comparative Efficacy of Metabolic/Bariatric Surgery Versus GLP-1 Receptor Agonists: A Network Meta-Analysis of Randomized Controlled Trials.

PubMed1 Apr 2026·Obesity (Silver Spring, Md.)● 7/10i

Comparative Efficacy of Metabolic/Bariatric Surgery Versus GLP-1 Receptor Agonists: A Network Meta-Analysis of Randomized Controlled Trials.

Sabatella L, Ortega PM, Azcárate VV, Sastre FR, Pagola AU et al.

Metabolic/bariatric surgery produces 10.3% greater total weight loss than GLP-1 receptor agonists at under 2 years, with the gap narrowing but persisting at longer follow-up. Network meta-analysis of 30 RCTs, 20,015 patients. This provides the first head-to-head comparison across all available GLP-1 therapies versus surgery, confirming surgery's superiority while positioning tirzepatide as the closest non-surgical alternative. Comparisons were indirect through lifestyle intervention as common comparator.

Strategic signal

This data strengthens Eli Lilly's positioning for tirzepatide in obesity by providing head-to-head evidence against the gold standard treatment. Payers will use this to justify step therapy requirements before approving bariatric surgery, potentially expanding GLP-1 coverage. The finding supports medical societies updating obesity treatment algorithms to position dual agonists as viable alternatives to surgery for appropriate patients, accelerating non-surgical obesity market growth.

GLP-1Weight lossEli Lilly

Original Abstract

OBJECTIVE: This study compared the efficacy of metabolic/bariatric surgery (MBS) and GLP-1 receptor agonists (GLP-1 RAs), including dual GLP-1/GIP analogues, for weight and metabolic outcomes in adults with obesity. METHODS: A network meta-analysis of randomized controlled trials compared MBS or GLP-1 RAs versus lifestyle intervention in adults with overweight or obesity. Primary outcomes were percent total weight loss (TWL) and BMI; secondary outcomes included body weight, waist circumference, HbA1c, and systolic blood pressure. Random-effects models used lifestyle intervention as the common comparator; all MBS versus GLP-1 RA comparisons were indirect. RESULTS: Thirty randomized controlled trials (n = 20,015) were included. At < 104 weeks, MBS achieved greater reductions than GLP-1 RAs in %TWL (ETD -10.3%; p = 0.001), BMI (-4.5 kg/m2; p < 0.001), body weight (-11.7 kg; p < 0.001), waist circumference (-12.6 cm; p < 0.001), and HbA1c (-0.5%; p = 0.033). At ≥ 104 weeks, differences remained for %TWL (-9.1%; p = 0.022) and body weight (-14.6 kg; p = 0.049). In tirzepatide-only analyses, differences versus MBS were not significant. Among participants with type 2 diabetes, MBS produced greater reductions in BMI, weight, waist, and %TWL, with similar HbA1c improvement. CONCLUSIONS: Both MBS and GLP-1 RAs provide substantial metabolic benefits. MBS remains superior, but tirzepatide is a promising nonsurgical option supporting personalized obesity care.

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