Why You May Have Stopped Losing Weight on Wegovy — and What to Do Next

What the STEP 1 data tells us about the shape of weight loss on semaglutide

The STEP 1 trial enrolled 1,961 adults with obesity or overweight and a weight-related condition, giving them either semaglutide 2.4mg weekly or placebo for 68 weeks. The trajectory of weight loss was not a straight line. Most participants lost weight fastest in the first four to five months. After that, the curve flattened considerably, with only modest further reduction recorded between weeks 28 and 68. For many people, the period between roughly months five and eight looks like a plateau on the scales even when fat mass is still shifting.

This pattern is recognised by the NHS medicines page for semaglutide, which notes that weight changes vary between people. Part of the explanation is physiological: as body weight falls, the body's total energy requirement falls with it. A daily calorie deficit that produced noticeable loss at a higher weight becomes progressively smaller in absolute terms as weight drops. The medicine is still doing its job of reducing appetite; the arithmetic of energy balance has simply shifted.

A second factor is metabolic adaptation. Research into prolonged calorie restriction consistently shows that resting metabolic rate can drop by more than simple mass loss would predict. This is sometimes called adaptive thermogenesis, and it is one reason people who have been losing weight on Wegovy for several months may find progress harder to sustain even when they have not changed their habits.

Practical reasons the scale stops moving, beyond biology

Biology is not always the whole story. A plateau can reflect a quiet drift in eating patterns that is easy to miss. Appetite suppression on semaglutide is real, but it is not uniform across every meal or every day, especially at lower doses or in people who have been on treatment long enough for the initial appetite change to feel ordinary. Some people gradually eat slightly more without noticing, particularly with energy-dense foods that do not take up much volume.

Dose is worth considering, too. Semaglutide is titrated in steps, from 0.25mg up to 1.7mg and then 2.4mg, with some patients now reaching 7.2mg following the MHRA's approval of the higher maintenance dose in early 2026. If you stopped losing weight on Wegovy before reaching your maintenance dose, your prescriber may assess whether you are on the optimal dose for your situation, or whether the current dose is appropriate to stay on while other factors are addressed.

It is also worth asking whether the scale is the right measure at this point. Body composition can shift (fat mass reducing, muscle mass holding or increasing if activity levels are higher) in a way that leaves overall weight static. If your waist measurement, how clothes fit, or your energy levels have changed, that tells a different story than the number alone. Our full Wegovy guide covers what realistic progress looks like over a full treatment course.

When to bring this to a prescriber, and what they will consider

If you have stopped losing weight on Wegovy and the plateau has lasted more than four to six weeks, it is worth a clinical conversation. A prescriber will look at several things: how long you have been on treatment, which dose you are currently taking, whether you are at or approaching your maintenance dose, and what is happening with your overall health and lifestyle context. They will also want to rule out any clinical reason (thyroid function, for instance) that might independently slow weight loss.

One of the questions our prescribers hear regularly is whether stopping and restarting the medicine would help. The answer is almost always no, and the evidence from trials like STEP 1 supports that: people who stopped semaglutide regained a significant proportion of lost weight within a year, which is explored in more detail on our page about what happens when you stop taking Wegovy. Continuing treatment, even during a plateau, protects the progress already made.

It is also worth knowing that a plateau is not a reason to assume the medicine has stopped working pharmacologically. Semaglutide's mechanism (slowing gastric emptying, increasing feelings of fullness, influencing appetite signals in the brain) does not simply switch off. What changes is the body's response to the resulting calorie deficit. That is a different problem, and often a manageable one. If you find yourself asking why you have stopped losing weight on Wegovy, our dedicated page works through the most common reasons in detail, and may help you decide whether your situation reflects a normal phase of treatment or something worth raising with a prescriber. You might find it useful to read about whether you can stop losing weight on Wegovy, before your next clinical review.

Semaglutide is a prescription-only medicine. Every decision about dose, duration, or changes to your treatment plan should be made with a clinician who knows your history. If you are a patient with a question that cannot wait until your next scheduled check-in, our aftercare team is available seven days a week. If you are not yet on treatment and are trying to understand how Wegovy works in practice, speaking to one of our prescribers is a good place to start.