Research
Energy balance
Current pharmacological treatments for obesity, including incretin-based therapies (semaglutide, tirzepatide), result in significant skeletal muscle loss (approx. 7-10% of lean mass) alongside fat loss.
If you are using GLP-1 medications, expect to lose some muscle. You must actively combat this by eating enough protein and doing resistance training to preserve your metabolic engine.
StrongSupportsHIGH confidence
Semaglutide (2.4 mg/week) and tirzepatide (5, 10, and 15 mg/week)... were associated with net losses of 10.1% and 7.9% of initial lean mass over the 68- to 72-week treatment periods.
Why this rating
Cites specific large-scale clinical trials (STEP 1, SURMOUNT-1).
Source
High-Quality Weight Loss in Obesity: Importance of Skeletal Muscle
Mary‐Ellen Harper et al. · Diabetes · 2025
DOI 10.2337/dbi25-0003
narrative_reviewCited 13×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- High-quality weight loss, defined as maximizing fat loss while preserving skeletal muscle mass, is critical for maintaining metabolic health, insulin sensitivity, and long-term weight maintenance.Good
- Resistance exercise combined with caloric restriction is the most effective non-pharmacological strategy for preserving skeletal muscle mass and strength during weight loss.Good
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