the lean mass thing comes up constantly. what the body comp data says.

GLP-1 muscle loss — how worried should we actually be?

MVMarcus Vale· 2 months ago

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the muscle-loss thing comes up constantly so here's my read from the body-comp substudies: yeah, some of the weight lost is lean mass — but that's true of basically all big weight loss, not something special about GLP-1s. the proportion looks broadly similar to plain diet weight loss.

the actual open question is whether lifting + enough protein protects lean mass as well on these drugs, and the controlled evidence there is thin. anyone tracking their own body comp on it?

2 Replies

MVMarcus Vale practitioner· Expert· 2 months ago

the practical takeaway is the modifiable stuff: resistance training + protein. the GLP-1-specific controlled evidence is thin but the general weight-loss literature is pretty consistent that both help retain lean mass.

Accepted solution

GAGrace A.· Senior· 2 months ago

most of the scary takes skip that lean-mass loss comes with basically ALL big weight loss, not just these drugs. the real question is proportion + whether training offsets it.