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A reader wrote in saying they’re back to their usual weight after using semaglutide for about a year, and it helped their cholesterol too. But now they have almost no energy for cardio or running—their favorite exercise—and they’re wondering what to do. They’re 32, got up to a higher weight during illness, and have worked on diet and protein, but still feel too tired to exercise. Semaglutide is the drug behind brand names like Ozempic and Wegovy. In simple terms, it copies a natural gut hormone that tells your brain you’re full and slows how fast your stomach empties. That helps people eat less and often lose weight. It also changes blood sugar handling and can improve cholesterol and other metabolic markers. People usually inject it weekly and notice smaller appetite and less hunger-driven snacking. What the snippet is telling us is anecdote-level: one person’s experience. That means it’s useful but not the same as a scientific study. Clinical trials of semaglutide show appetite suppression and weight loss for many people, and some report lower energy or fatigue as a side effect. But energy levels can come from many things—calorie intake, protein, iron or vitamin levels, sleep, other illnesses, medications, and how quickly weight comes off. Trials don’t always capture individual patterns like “I can’t do cardio anymore,” so we can’t say semaglutide definitely caused this person’s low exercise energy. Why this matters: exercise and cardio have benefits beyond weight—mood, heart fitness, endurance, and muscle tone. If a drug helps you lose weight but makes it hard to keep up physical activity, that changes the overall health trade-off and people’s quality of life. Runners and active people considering or using semaglutide should watch for changes in stamina, appetite for protein and calories, and recovery after workouts. Adjusting diet, timing of meals, and training plans might help maintain exercise while on the medication. Caveats and risks: single-person stories don’t prove cause and effect. Fatigue while dieting or losing weight is common because you’re eating fewer calories; if you’re not eating enough carbs or calories around workouts, or if protein is low, endurance can drop. Semaglutide can also cause side effects like nausea, constipation, or low energy in some people. Other issues—iron deficiency, low Vitamin D, thyroid problems, sleep disturbances, or the underlying chronic illnesses this person had—could be the real or additional causes. If exercise capacity falls a lot, check with a clinician: they can test for deficiencies, review other drugs, and help tweak dose, timing, or an exercise plan. Don’t stop or change prescription meds without medical advice. Bottom line: semaglutide helps many people lose weight and improve metabolic measures, but some users report less exercise energy—whether that’s from the drug, fewer calories, or other health issues isn’t certain—so talk to a clinician and consider diet, testing, and training adjustments.
Source: r/Semaglutide