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A person online posted that after three months on semaglutide they lost about 16 pounds but noticed their strength in the gym dropped a lot. They blamed muscle loss and said common advice—“eat a lot of protein”—isn't helpful when the drug kills your appetite. They also claimed, based on a quick look at clinical data, that if you don’t get roughly 1.8 grams of protein per kilogram of lean body mass you’ll lose muscle while on these drugs. Semaglutide is the active drug in popular weight-loss and diabetes medicines like Ozempic and Wegovy. It acts like a natural gut hormone that reduces appetite and slows stomach emptying, so people feel less hungry and eat less. It’s not a steroid or a muscle-eating poison; it’s a medication designed to change hunger signals in the brain and gut. That change in appetite is exactly why many people lose weight on it. What this post reports is an individual’s experience, not a controlled study. Single-person reports can be true for that person but don’t prove a general rule. Clinical trials of semaglutide have shown significant weight loss, and some loss of lean body mass (muscle) can happen when people drop weight quickly. The exact amount varies by study, how much someone exercises, how much protein they eat, and their starting body composition. The specific number the poster cites (1.8 g/kg of lean mass) sounds like a higher protein target some experts recommend for preserving muscle during weight loss, but whether that exact threshold is required for everyone on semaglutide isn’t settled by broad clinical evidence. Why this matters: many people taking semaglutide are trying to lose fat while keeping muscle for health, appearance, or athletic performance. If your appetite is low, it can be hard to eat enough protein and calories to maintain strength. That makes strategies like prioritizing protein at meals, using protein supplements or shakes, and keeping resistance (weight) training in your routine especially relevant. People who care about strength or muscle should plan for those challenges rather than assuming weight loss will only be fat. Caveats and risks: an online rant isn’t a substitute for clinical guidance. Not everyone on semaglutide loses muscle to the same degree, and exercise and diet choices strongly influence outcomes. Higher protein intake can help, but extreme amounts may not be necessary or safe for everyone—especially people with certain kidney problems—so check with a clinician. Also, semaglutide is a prescription medication with possible side effects (nausea, GI upset, rare but serious risks) and should be used under medical supervision. The post’s blunt claims about a strict protein cutoff should be treated as one person’s interpretation, not settled medical fact. Bottom line: some people on semaglutide report losing strength, and keeping muscle may require conscious choices about protein and resistance training; talk to your doctor or a dietitian for personalized advice.
Source: r/Semaglutide