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Someone on an online forum who’s taking Wegovy (a prescription drug for weight loss) reported a shocking experience: after a short four-day trip they suddenly gained about 2 kg (4–5 pounds), then dropped it again within a few days after coming home. They also said they had been urinating a lot during that time and wondered whether semaglutide (the drug in Wegovy) was somehow causing the body to store and then release extra water with activity like walking. Semaglutide is the active ingredient in drugs called Ozempic and Wegovy. It’s a lab-made version of a natural gut hormone that helps control appetite and slows stomach emptying so you feel full longer. Doctors prescribe it mainly to help people lose weight and for some types of diabetes. It’s not a diuretic (a drug made to make you pee more) in the usual sense, and its main known effects are on appetite, digestion speed, and some metabolic signals. What this post describes is an anecdote — one person’s experience — not a controlled study. They noticed a quick weight increase during a short trip and then rapid loss afterward, with lots of urination while away. Short-term weight swings of a kilogram or two are common and often reflect changes in water balance, salt intake, carbohydrate stores, or meals rather than actual fat gain. There isn’t solid published evidence that semaglutide directly causes major water retention and release linked to walking or travel. Some clinical trials list swelling or fluid-related issues in small numbers of people, but the big, randomized studies focus on weight loss and metabolic outcomes, not acute day-to-day fluid shifts. Why people notice this matters because many users track their weight closely and expect steady declines. Sudden jumps can be alarming and might be blamed on the drug when they’re actually due to temporary things like more salty restaurant meals, changes in how much you walk or stand, hormonal cycles, or travel-related fluid shifts. If semaglutide does have any influence on fluid balance, it would be important for people who have heart, kidney, or blood pressure problems, because those conditions are sensitive to fluid changes. For most otherwise healthy people, short-term water weight swings are benign. Caveats: this is one person’s story, not proof. Semaglutide is approved for weight management and diabetes but can cause side effects like nausea, constipation, or rarely more serious issues; it’s not approved as a diuretic or for controlling fluid balance. If someone has unexplained swelling, sudden weight changes, shortness of breath, or a history of heart or kidney disease, they should contact their doctor. Also, self-adjusting dose or stopping medication based on a single episode isn’t advisable without medical advice. Bottom line: sudden 1–2 kg weight swings during a trip are probably water-related and not solid evidence that semaglutide causes “insane” water retention; if you’re worried or have other symptoms, talk to your clinician.
Source: r/Semaglutide