Lean Mass, Bone Loss & the GLP-1 Panic

The internet says GLP-1 drugs are stealing your muscle. That “up to 40% lean mass loss” is supposed to scare you. But here’s the problem: it’s not new, it’s not unique, and it’s not what they say it is.In this episode, Dr. Terry Simpson breaks down what really happens to lean body mass during weight loss—whether it’s diet, surgery, or medications like semaglutide. He explains why glycogen and water get mislabeled as “muscle loss,” why severe protein deficiency is actually rare, and why most people naturally move more—and get stronger—after losing weight.Then we tackle bone: why some bone loss is a normal adaptation to carrying less weight, what actually causes osteoporosis, and why staying active matters far more than clinging to excess pounds out of fear.And yes—we take on the “gym bro” narrative that GLP-1s are dangerous unless you follow their program. (Spoiler: that’s not evidence, that’s marketing.)If you’ve heard the panic, this is the episode that puts it back into physiology. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.drsimpson.com/subscribe