How to Keep Muscle While Losing Weight on a GLP-1

A GLP-1 medication like Ozempic, Wegovy or Mounjaro makes losing weight easier — but research consistently shows that without deliberate effort, a large share of what you lose can be muscle rather than fat. The drug doesn't distinguish. Your body does — only if you give it the right signals. Three things, done consistently, change the outcome.

1. Hit your protein target

Protein is the primary nutritional signal to your body that it should preserve muscle. On a GLP-1, appetite suppression makes this harder to achieve on food alone — which is exactly when it matters most. The target is roughly 1.2–1.6g of protein per kilogram of bodyweight per day, prioritised above everything else at every eating occasion.

On high-nausea or very low appetite days, a whey protein isolate shake is the most reliable bridge — around 20–25g of protein in one drink, when solid food isn't feasible.

2. Resistance train 2–3 times a week

Protein gives your body the material to preserve muscle. Training gives it the reason. Without a mechanical stimulus telling your body the muscle is being used, it has no strong incentive to maintain it during a calorie deficit. Two to three short sessions a week — even bands, bodyweight or light dumbbells — is enough to send that signal. Consistency across weeks matters far more than intensity or duration at any single session.

3. Cover the nutritional gaps

Three compounds have strong human-trial evidence for what your body needs in a deficit:

• Creatine (3–5g daily) — helps preserve muscle strength and mass in a calorie deficit. Among the most studied supplements available. No loading phase needed.
• Omega-3 (EPA+DHA) — supports cardiovascular and metabolic health during significant rapid weight loss.
• Magnesium — the first micronutrient to run low when you eat much less; supports energy production, muscle function and sleep quality.

The GLP-1 Support Stack bundles all four compounds — protein, creatine, omega-3 and magnesium — at evidence-dosed amounts in one stack.

4. Don't crash the loss

Faster is not better when it comes to the muscle-to-fat ratio of what you lose. Follow your prescriber's titration schedule and resist pushing dose changes faster than advised. Slower, steadier loss preserves more lean tissue and gives skin more time to adapt. The number on the scale is only part of the result — what it's made of matters.