Appetite comes back, and with it most of the weight. This is well documented and it is worth knowing before you stop rather than after.

The number

The STEP 1 trial extension followed participants for a year after semaglutide was withdrawn. In that group, mean weight loss on treatment was 17.3% over 68 weeks. One year off the medication, they had regained 11.6 percentage points — about two thirds of what they lost — leaving a net loss of 5.6%.

Cardiometabolic improvements largely reverted alongside the weight.

Two honest readings of that. The pessimistic one is that most of it came back. The realistic one is that a third of it did not, and a net 5.6% loss a year after stopping is not nothing.

Why it happens

These medications work while they are present. They suppress appetite and slow gastric emptying, and when they are withdrawn both effects go.

What returns is not simply your old appetite. A smaller body needs less energy than it did, so maintaining the new weight requires eating less than you used to — at the same time as appetite is returning to what it was. That is the difficulty in one sentence, and it is a physiological one rather than a matter of discipline.

This is why obesity is increasingly described as a chronic condition in this literature, and why the trial authors concluded that ongoing treatment is required to maintain the improvements.

The part most people miss

Weight regained without resistance training is disproportionately fat.

The weight lost was a mixture of fat and lean tissue. The weight regained, absent a training stimulus, is largely fat. Over a full cycle of loss and regain, that leaves someone at a similar body weight with a higher body fat percentage than they started with.

The scale returns. The composition does not. This is the strongest reason to have built a training habit before you stop, and it is covered in more detail in do you get the muscle back.

If you are stopping by choice

Consider whether you need to. Cost, side effects and supply problems are all real reasons, and some of them have answers — a lower maintenance dose, a different medication, or a different supplier. Those are conversations with your prescriber, and they are worth having before stopping rather than after.

If you are stopping regardless, the things that change the outcome:

  • Keep the resistance training. It is the single most important thing, and it is usually the first thing dropped.
  • Keep protein high. It matters more, not less, once total intake climbs again — it is what gives regained weight a chance of being muscle.
  • Weigh regularly and decide a threshold in advance. A specific number at which you will get back in touch with your prescriber is much easier to act on than a vague intention.
  • Taper if your prescriber suggests it. Sometimes an option, and it is their call.

If you are stopping involuntarily

Supply shortages and insurance changes are common and this is not a failure on your part. The advice above holds. It is also worth asking about alternatives — the class has several medications and they are not interchangeable in availability or cost.

What is genuinely under your control

Not appetite. That returns and there is limited point pretending otherwise.

What is under your control is what the returning weight is made of, and that comes down to whether you are still lifting and still eating protein. The muscle check works the same whether or not you are currently taking anything — if you want to know where you stand now, it will tell you.