GLP-1s: experts warn on muscle loss

Men’s Journal published an expert guide on May 19 warning that people using GLP-1 weight-loss drugs should actively work to preserve lean mass while they lose weight. The article said rapid weight loss can reduce muscle as well as fat and framed resistance training and higher-protein intake as the main defenses. (mensjournal.com) The guide was written by Dana Angelo White and cited fitness and nutrition experts on how to limit muscle loss while taking the drugs. (northcountrypublicradio.org) ### Why are GLP-1 users being told to think about muscle, not just the scale? GLP-1 drugs such as semaglutide and tirzepatide are widely used for weight loss, but Men’s Journal said the number on the scale does not show how much of that loss comes from fat versus lean tissue. (sciencedirect.com) Its May 19 guide said preserving lean mass is important for long-term health while weight comes down. U.S. News reported in March that concern over “muscle wasting” on GLP-1s has become a recurring question for patients using drugs such as Wegovy and other GLP-1 medicines. That report also described preserving lean mass as a central goal during treatment. (mensjournal.com) ### What did the Men’s Journal guide actually recommend? Men’s Journal said resistance training should be part of the plan “the second you start a GLP-1,” alongside nutrition changes aimed at protecting muscle. The article described those steps as strategic workout and dietary adjustments rather than passive weight loss. (mensjournal.com) The same guide pointed readers toward whey protein as a practical tool to support muscle retention, especially when appetite is reduced and total food intake falls. That approach matches the article’s broader emphasis on maintaining adequate protein while body weight declines. (health.usnews.com) ### What evidence is there for whey protein and lifting? A 2024 systematic review in *Journal of Nutrition, Health and Aging* found whey protein-enriched supplements, with or without resistance training, improved measures of sarcopenia in older adults. The review examined older patients diagnosed with sarcopenia under established criteria. (mensjournal.com) A 2023 meta-analysis in *Nutrients* found whey protein supplementation during resistance exercise training improved skeletal muscle mass, strength and physical performance in older people with sarcopenia. Another recent systematic review reported that protein supplementation combined with resistance exercise was effective in improving muscle mass and strength in community-dwelling older adults with sarcopenia. (mensjournal.com) ### Why does age 50 keep coming up in this discussion? Older adults face a higher risk of sarcopenia, the age-related loss of muscle mass and strength, which is why studies and media coverage often focus on people over 50 or 60. The research Men’s Journal drew on fits that pattern: the evidence base for protein and resistance training is especially developed in older populations. (sciencedirect.com) That does not mean younger GLP-1 users are unaffected. It means the strongest published evidence highlighted in this round of reporting comes from studies of older adults, where muscle preservation has long been a clinical focus. (mdpi.com) ### How does insurance coverage fit into the story? NPR reported on May 19 that most employer health plans still do not cover GLP-1s for weight loss. Its report said roughly 20% do, even as some employers have argued the drugs could reduce longer-term obesity-related medical costs. (sciencedirect.com) That leaves patients and clinicians dealing with two separate questions at once: who can access the drugs, and how to manage body composition safely for those who do. Men’s Journal addressed the second question directly with advice centered on strength training and protein intake. (sciencedirect.com) ### What should readers watch next? NPR’s May 19 reporting points to employer coverage as one next marker to follow, particularly whether more plans begin paying for GLP-1s for weight loss. On the clinical side, the current reporting suggests readers should watch for more guidance tying GLP-1 treatment to resistance training, protein targets and body-composition monitoring rather than weight alone. (northcountrypublicradio.org) (mensjournal.com)