Do GLP-1 medications cause muscle loss?

On Ep. 358, Nikkiey puts the numbers in real terms. If a woman loses 30 pounds on a GLP-1 and 40% of that is lean mass, up to 12 of those pounds may be muscle. The scale is lower and the photos look different, but she says the muscle-to-fat ratio, which she ties to metabolism, strength and long-term health, may not have improved nearly as much as the weight loss suggests. On Ep. 301 she adds that for women around 40 to 50, when hormonal changes already speed up muscle loss, the percentage could be even higher.

On Ep. 301 she describes what can follow. As she tells it, metabolism slows while people are on the medication, and many end up feeling tired, not strong, and unable to eat without gaining weight. She calls it the same cycle women have lived through for decades, just packaged differently.

She is not judging anyone who uses these medications and acknowledges they can help people lose weight. Her point is that the conversation about what kind of weight you lose is often missing. If you are on a GLP-1 or considering one, the show's takeaway is to treat protein and strength training as deliberate priorities, and to talk with your doctor about your medication and how to protect your muscle along the way.