Keeping muscle while the scale drops
Last updated November 10, 2026
When weight comes off quickly, part of it is muscle. In body-composition sub-studies of the GLP-1 class trials, roughly a quarter or more of the weight lost was lean mass.
Why it happens
A large calorie deficit with low appetite makes it easy to under-eat protein, and a body that is not asked to lift anything has no reason to keep expensive tissue.
Protein
Sports nutrition guidance for people in a deficit commonly lands around 1.2 to 1.6 grams per kilogram of body weight per day, spread across meals. When appetite is low, protein goes first on the plate.
Resistance training
Two to three sessions a week covering the big movement patterns: squat or leg press, hinge, push, pull, carry. Progress the load slowly. The goal is to give muscle a reason to stay.
| Habit | Target |
|---|---|
| Protein | 1.2 to 1.6 g per kg per day |
| Strength sessions | 2 to 3 per week |
| Daily movement | A step count you can hold |
What to track
Scale weight alone hides the split. Waist measurement, strength numbers and, where available, a body-composition scan show whether the loss is coming from the right place.