Does retatrutide burn fat?
Yes, it reduced fat mass in people. In a DXA body-composition substudy in type 2 diabetes, fat mass fell 23.2% on 12 mg and 26.1% on pooled 8 mg, against 4.5% on placebo.
Short answer
Yes, it reduced fat mass in people. In a DXA body-composition substudy in type 2 diabetes, fat mass fell 23.2% on 12 mg and 26.1% on pooled 8 mg, against 4.5% on placebo.[1]
The substudy authors concluded that total body fat mass fell significantly more than with placebo or dulaglutide in adults with type 2 diabetes.[1]
What about muscle
Lean mass was lost along with fat, in a proportion the authors say is similar to other obesity treatments.[1]
A review of incretin-type drugs in general (not a retatrutide measurement) estimates lean-mass loss of about 10%, or 6 kg.[2]
How it might burn fat
In obese mice, activating the glucagon receptor added higher energy expenditure to the appetite-lowering effects of the other two receptors. This is animal data.[3]
Common questions
How does retatrutide burn fat?
The human data show fat mass fell; the proposed route is partly lower calorie intake and, from mouse studies, higher energy expenditure through the glucagon receptor.[3]
More questions on Retatrutide
More on Retatrutide
Sources
- 1Effects of retatrutide on body composition in people with type 2 diabetes: a substudy of a phase 2, double-blind, parallel-group, placebo-controlled, randomised trial.The lancet. Diabetes & endocrinology · 2025PMID 40609566Accessed 2 Oct 2026
- 2Incretin-Based Weight Loss Pharmacotherapy: Can Resistance Exercise Optimize Changes in Body Composition?Diabetes care · 2024PMID 38687506Accessed 2 Oct 2026
- 3LY3437943, a novel triple glucagon, GIP, and GLP-1 receptor agonist for glycemic control and weight loss: From discovery to clinical proof of concept.Cell metabolism · 2022PMID 35985340Accessed 2 Oct 2026
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