How Much Muscle Do You Actually Lose on GLP-1s?
GLP-1 drugs have made weight loss easier—and that’s one reason some people see them as controversial. There’s a vocal group of critics who take issue with what they represent: a faster, less effortful way to get results that traditionally required strict dieting and consistent training. And that discomfort has fueled a wave of claims about why these drugs are supposedly a bad idea. One of the most persistent is that they cause excessive muscle loss—enough to outweigh the benefits of fat loss. Some go further, arguing that people can even lose more muscle than fat while taking them. At first glance, that concern isn’t entirely unreasonable. People who lose weight without drugs often adopt habits like lifting weights and eating enough protein, which help preserve muscle and support physical and metabolic health. GLP-1 drugs, by contrast, can produce significant weight loss without requiring those habits upfront—and skipping them could make muscle loss significantly worse. But pla...