Key takeaways
- Some of the weight lost on GLP-1 medicines can come from lean mass, including muscle.
- Protein (often 1.2–1.6 g per kg of body weight a day during weight loss) and strength training are the two main ways to help protect muscle.
- Two or three short strength sessions a week are enough to start.
- Track more than the scale: waist, photos and strength show fat loss that weight alone can hide.
Why muscle matters
Whenever you lose weight, some of it comes from lean mass, not just fat. Body-composition studies of GLP-1 medicines show this happens on treatment too. Muscle keeps you strong, supports your joints and balance, and helps you stay active, so protecting it is worth a little planning, especially as your appetite gets smaller.
The three habits
1. Protein first
Many dietitians suggest about 1.2–1.6 g of protein per kg of body weight a day during weight loss, spread across meals. Start each meal with protein so it doesn’t get crowded out. Work out your number with the GLP-1 protein calculator.
2. Strength training
Health guidelines recommend muscle-strengthening activity on at least two days a week. You don’t need a gym: a 15-minute routine with your body weight or light dumbbells is a great start.
3. Move every day
Daily walking supports your heart, mood and digestion, which can help with constipation. Build up gently towards your step goal.
A 12-week plan
| Weeks | Focus | What to do |
|---|---|---|
| 1–4 | Foundations | Hit your protein target most days, two 15-minute strength sessions a week, a short daily walk |
| 5–8 | Build | Add a set or a few reps to each move, a third session if you feel up to it, gently raise your step goal |
| 9–12 | Progress | Use slightly heavier weights or harder variations, keep protein steady, review progress photos and waist |
On weeks when side effects are harder, keep it gentle: a short walk and protein still count.
Measure what matters
- Weight trend over weeks, not day to day
- Waist measurement every one to two weeks
- Progress photos in the same light and pose
- Strength: the reps or weight you can manage
Panda’s fat-loss coach puts these next to your dose steps, so you can see the full picture.
When to talk to your clinician
Ask your clinician before starting exercise if you have a heart condition, joint problems or feel dizzy or faint. If you can’t eat enough because of nausea or vomiting, or you’re losing weight very quickly, let them know.
Sources
- World Health Organization: Physical activity fact sheet
- CDC: Physical activity guidelines for adults
- Wilding JPH et al. STEP 1 trial, N Engl J Med 2021 (including body-composition sub-study)
This guide is general information, not medical advice, and doesn’t replace a conversation with your prescriber, pharmacist or doctor. Panda never suggests, calculates or changes a dose.
