Encyclopedia entry

Muscle preservation on GLP-1

Three levers, all well-established in clinical nutrition and exercise science, materially reduce the lean-mass fraction of weight loss during rapid GLP-1 intervention: adequate protein, resistance training, and sleep. None are GLP-1-specific protocols; they are the standard muscle preservation framework applied during any caloric-deficit period.

Lever 1: protein intake

1.2 to 1.6 grams of protein per kilogram of goal body weight per day, distributed across 3 to 4 meals. Each meal in the 0.4 to 0.6 g/kg/meal range crosses the muscle-protein-synthesis threshold. Distribution matters more than total alone; 90 grams across one meal does less than 90 grams across three.

Lever 2: resistance training

Two to three sessions per week of full-body strength work covering the major movement patterns (squat, hinge, push, pull, carry). 6 to 10 working sets per major muscle group per week is the consensus minimum effective volume for maintenance. Heavier weights with lower reps preserve neural strength alongside mass; lighter weights to fatigue can substitute if joint constraints exist.

Lever 3: sleep

7 to 9 hours per night. Restricted sleep (under 6 hours) during caloric deficit shifts a substantial portion of weight loss from fat to lean mass; published data (Nedeltcheva 2010) shows 60 percent of loss as lean mass under sleep restriction versus 20 percent at adequate sleep. Sleep is the most often-neglected lever.

Supplementary levers

• · Creatine monohydrate 3 to 5 g/day: cheap, well-evidenced for strength and muscle mass preservation.
• · Vitamin D where deficient: supports musculoskeletal health, particularly relevant in UK winter.
• · Walking or low-intensity steady-state cardio: does not preserve muscle but does not actively undermine it; cardiovascular and adherence benefits.

Your prescriber and dietitian adjust this framework for your circumstances. We do not provide specific protocols to specific people.

Related: protein on GLP-1 · sarcopenia · body recomp.