Modern longevity medicine is undergoing a seismic shift. GLP-1 agonists like Semaglutide, Tirzepatide, and non-FDA approved yet rampant in the online community, Retatrutide, have transformed weight-loss treatment, reshaping bodies and metabolic health at a speed we’ve never seen before. But there is a problem no one is talking about loudly enough: **These medications don’t just melt fat — they can melt muscle.And in the longevity world, muscle is life.Up to 30–40% of the weig