GLP-1 and muscle loss — what actually matters

If you use GLP-1 to lose weight, you will lose weight. What you will not automatically lose is only fat. Muscle loss comes with rapid weight reduction — unless you actively pull three levers.

1. Prioritize protein

At least 1.6 g of protein per kilogram of bodyweight per day. Sounds like a lot, and is harder when appetite is suppressed. Strategy: protein shakes as insurance, deli meats as a base, eggs or yogurt for breakfast.

2. Train strength, not cardio

Two to three sessions of heavy resistance training per week is the minimum stimulus to preserve muscle. Cardio is fine for your heart, but does not prevent muscle loss in a calorie deficit.

3. Watch the pace

Losing more than 1% of bodyweight per week is always a red flag — regardless of the method. On GLP-1 this happens easily because hunger is gone. Weigh weekly, same day, same time.

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These three levers together explain why some people keep their strength on GLP-1 while others come out brittle. It's not luck — it's execution.