How to Keep Muscle While Losing Weight on GLP-1

One of the lesser-discussed risks of GLP-1 medications like Mounjaro and Zepbound is muscle loss. When you eat significantly less, your body can break down muscle tissue for energy if protein intake is low. Studies suggest that without deliberate resistance training and high protein intake, up to 30 percent of weight lost on GLP-1s can come from lean mass.

The single most important lever is protein. Research consistently shows that 1.6 to 2.2 grams of protein per kilogram of body weight per day is the range that preserves muscle during caloric restriction. For a 75 kg person that is roughly 120 to 165 grams per day, spread across three or four meals.

Resistance training is the other non-negotiable. Two to three sessions per week of progressive overload training (adding weight or reps over time) send a signal to your body that muscle is needed and should not be cannibalized. Even bodyweight exercises like push-ups and squats work if you add difficulty progressively.

Creatine monohydrate is the most evidence-backed supplement for muscle preservation during weight loss. Three to five grams per day is safe for most people and has been shown in multiple studies to reduce muscle loss in calorie-restricted populations.

Sleep and stress management matter too. Cortisol is catabolic, meaning it breaks down muscle. Chronic poor sleep elevates cortisol. Eight hours of quality sleep combined with basic stress reduction can make a measurable difference in your body composition over three to six months.

Mello helps you track your protein intake on every meal via the AI food scanner. Log your food with a photo, see your macros instantly, and check whether you are hitting your daily protein target. Combined with consistent training, this makes GLP-1 weight loss work for your body long-term. Try Mello free for 3 days.