Hormonal
GLP-1 and dual GLP-1/GIP receptor agonists (semaglutide, tirzepatide, liraglutide) produce significant, clinically meaningful weight loss (10-21%) and reduce the incidence of type 2 diabetes in adults with overweight or obesity, with effects rivaling metabolic surgery.
GLP-1 and dual agonists are highly effective for significant weight loss (up to 21%) and diabetes prevention in adults with obesity. They work by targeting hormonal pathways to reduce appetite and improve insulin sensitivity. While effective, they require long-term use to maintain benefits, as stopping leads to significant weight regain. Side effects like nausea and diarrhea are common but manageable, and the choice of agent depends on individual tolerance and specific health goals.
The dual GLP-1 and GIP analog tirzepatide has demonstrated the greatest reduction in weight, with a 20.9% weight loss achieved with tirzepatide 15 mg weekly at 72 weeks... A 3-year trial of liraglutide in those with pre-diabetes and obesity demonstrated reductions in diabetes diagnosis by 70% and increased reversion to normoglycemia by 80% compared to placebo.
Why this rating
Based on multiple large-scale, randomized, placebo-controlled trials (RCTs) with thousands of participants (e.g., SURMOUNT, STEP, SCALE).
Source
A Narrative Review of the Metabolic Benefits of GLP-1 and GIP Receptor Agonists in Obesity
Andrew-Hyun Lee et al. · Healthcare · 2026
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