Usually one of four things. Your weight loss has reached its natural plateau and appetite is creeping back, the scale is reading water and digestion rather than fat, there has been a gap or change in the medication, or something unrelated is moving the number. In the large semaglutide trials, weight loss slowed and held after roughly 65 weeks, so a stall followed by a small gain is common.
The useful question is not "why did I gain two pounds this week" but "is my average actually rising". Those two have very different answers.
When weight loss on semaglutide usually levels off
Ozempic and Wegovy both contain semaglutide. Ozempic is the brand approved for type 2 diabetes, and Wegovy is the brand approved for weight management, so the long weight trials were run with Wegovy. Their shape is consistent.
In STEP 1, published in the New England Journal of Medicine, people lost an average of 14.9 percent of their body weight over 68 weeks. STEP 5 followed people for two years and found 15.2 percent at week 104, almost the same figure. And in the SELECT trial's weight analysis in Nature Medicine, which tracked more than 17,000 adults, weight loss continued over 65 weeks and was then sustained for up to 4 years.
So the drug does not keep taking weight off at the early pace. Somewhere around a year to fifteen months, most people reach a level and stay there. If you have been on semaglutide for a while and the losses have stopped, that is the expected pattern, not a sign that something broke. We cover that stall in more depth in why weight loss stalls on a GLP-1.
Reason 1: appetite creeps back after the plateau
Semaglutide works mainly by changing how much you want to eat. A 12 week trial in Diabetes, Obesity and Metabolism found people ate 24 percent less across a day of free-choice meals, with less hunger, fewer cravings and better control of eating.
At the plateau, your body is smaller and needs less energy than it did at the start. If portions drift up even slightly, or the snacks that felt pointless six months ago start to look interesting again, the small difference shows up on the scale. People often describe this as the quiet coming back a little, the same food noise the medication turned down.
No trial has measured exactly how often this happens during treatment, so treat it as a likely cause rather than a proven one. The way to check is to look at what changed. Longer gaps between meals followed by a big evening, more grazing, less protein at breakfast. Those are easier to spot when you write them down for a week.
Reason 2: the scale is reading water and digestion
A single weigh-in includes everything in you that morning: water, salt, food that has not moved through yet. Constipation is one of the more common digestive effects of GLP-1 medicines, and slower digestion alone can add weight to a morning reading without adding any fat.
A salty restaurant meal, a hard workout, poor sleep, a change in the weather or the days before a period can each push the scale up and then let it fall back. That is why a two or three pound jump over a weekend is rarely what it looks like. How to tell if it is water weight walks through four checks you can run in a week.
Reason 3: gaps or changes in the medication
Real life interrupts treatment. Pharmacy shortages, insurance changes, travel, side effects that make a week hard to face. The trials show how much the medicine itself is holding the weight in place.
In STEP 4, published in JAMA, everyone took semaglutide for 20 weeks and lost an average of 10.6 percent. Then some were switched to a placebo without knowing it. Over the next 48 weeks the placebo group gained 6.9 percent, while the group that stayed on semaglutide lost another 7.9 percent.
If your gain lines up with a missed stretch or any change in your treatment, that is worth telling your prescriber plainly. What happens next with your medication is their call with you, not something to adjust on your own.
Reason 4: something else is moving the number
Weight is affected by more than one medicine. Some other prescriptions are known to make weight harder to hold, thyroid changes can shift it, and the years around menopause change where and how easily the body stores fat, which we covered in why maintenance gets harder at menopause. Poor sleep over several weeks also raises appetite.
You do not need to diagnose any of this yourself. If the gain is steady and none of the first three reasons fit, it belongs in a conversation with your doctor, ideally with your numbers in hand.
How to tell a blip from a real gain
The fix for a noisy scale is an average. Weigh yourself in the morning, under similar conditions, and judge the 7 day rolling average rather than any single day. A weekend spike barely moves a 7 day average. A real gain moves it steadily.
This is exactly how OffRamp's Regain Radar works, and why we built it that way. It compares your 7 day average with your own baseline weight. It only reports drift when that average sits 2 percent or more above baseline on every one of 7 days in a row, and an alert at 4 percent, held the same way. With an 80 kg baseline, the drift line is 81.6 kg. One salty dinner cannot trip it. Two quiet weeks of extra snacking will.
When the radar does show drift, the useful response is small and boring: get your protein floor back, keep your two short strength sessions, and look at what changed in the last fortnight. If it keeps climbing, OffRamp can export a PDF of your weigh-in history to bring to your prescriber. We put together seven questions worth taking to that appointment as well.
