What Happens When You Stop Taking a GLP-1?

Short answer: most people regain a large share of the weight they lost within a year of stopping a GLP-1 medication such as Wegovy (semaglutide) or Mounjaro (tirzepatide). Appetite returns within weeks, and improvements in blood pressure, blood sugar and cholesterol tend to fade with it. But regain is not the same for everyone, and what you eat, how you move and how you come off the medication all make a difference.

By Sara Hausmann, HCPC-Registered Dietitian. Last reviewed October 2026.

If you’re on a weight-loss injection, you’ve probably wondered what happens when it ends. Maybe the cost is adding up, side effects are wearing you down, or you’ve reached your goal and want to know whether you can keep it. In my clinic, it’s one of the questions I hear most.

Here’s what the research actually shows, and what you can do about it.

How much weight do people regain after stopping a GLP-1?

In the major trials, people regained roughly half to two-thirds of the weight they had lost within a year of stopping.

The largest review so far, published in The BMJ in January 2026 by Oxford researchers, pooled 37 studies and over 9,300 people. On average, people regained around 0.4 kg a month after stopping, and regain was faster than after ending a diet and exercise programme.

Two important caveats. Only eight of those studies looked at the newer GLP-1 medications, and none followed people for more than a year after stopping. And averages hide a lot of variation: in SURMOUNT-4, around 1 in 5 people regained less than a quarter of their lost weight.

Why does the weight come back?

Weight regain after stopping is biology, not a lack of willpower.

GLP-1 medications mimic a gut hormone that helps you feel full and quietens “food noise”. Semaglutide stays in the body for weeks after the last injection, so hunger usually returns gradually over the following weeks rather than overnight. When it does, it can feel stronger than you remember.

At the same time, your body responds to weight loss by trying to defend its old weight: hunger hormones rise and you burn slightly less energy. If muscle was lost along with fat, your metabolism has less to work with. That’s why the habits you build while on treatment matter so much.

What happens to blood sugar, blood pressure and cholesterol?

The health improvements tend to follow the weight back up. In the STEP 1 extension, most heart and metabolic markers drifted back towards where they started within a year of stopping semaglutide. The 2026 BMJ review found the same pattern for blood sugar, blood pressure and cholesterol across many studies.

The encouraging flip side: in SURMOUNT-4, people who kept their regain small also largely kept their improvements in waist size, cholesterol and insulin. Protecting your weight protects your health gains too.

How can you stop a GLP-1 without regaining weight?

There’s no guaranteed method yet, but these steps give you the best chance. Start them while you’re still on treatment, not after.

1. Talk to your prescriber first. Never stop suddenly without advice. They can discuss whether to stay on, reduce the dose gradually or stop, based on your health.
2. Prioritise protein at every meal. Protein helps you feel full and protects muscle. Aim for a palm-sized portion of fish, eggs, Greek yoghurt, tofu, beans, lentils or lean meat at each meal.
3. Build muscle with strength training. UK guidelines recommend muscle-strengthening activity on at least two days a week. More muscle supports your metabolism as appetite returns.
4. Fill up on fibre. Vegetables, fruit, wholegrains, beans and pulses add volume and keep you satisfied for longer.
5. Plan for hunger coming back. Regular meals, planned snacks and knowing your personal triggers help you respond to stronger hunger rather than be surprised by it.
6. Keep an eye on the trend. Weigh yourself weekly or track your waist. Catching a small rise early is far easier than reversing a large one.
7. Get support. People do better with ongoing help. A qualified nutrition professional can tailor a plan to you.

Frequently asked questions

Will I definitely regain weight if I stop Mounjaro or Wegovy?

Not definitely. Most people in trials regained a large share, but about 1 in 5 in SURMOUNT-4 regained less than a quarter of what they lost.

How quickly does weight come back after stopping a GLP-1?

Appetite usually returns within a few weeks. A 2026 BMJ review found people regained around 0.4 kg a month on average.

Do you end up heavier than before you started?

On average, no. People in STEP 1 and SURMOUNT-4 were still below their starting weight a year after stopping, though longer-term data is limited.

Are there withdrawal symptoms when you stop a GLP-1?

There’s no recognised withdrawal syndrome. The main change people notice is hunger and food thoughts returning.

What should I eat after stopping a GLP-1?

Build meals around protein, vegetables, fibre-rich carbohydrates and healthy fats, and keep regular mealtimes. A nutrition professional can personalise this for you.

Thinking about coming off your GLP-1?

Stopping doesn’t have to mean starting over. With the right plan in place before and after your last injection, you can give yourself the best chance of holding on to the progress you’ve made.

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This article is for general information and isn’t a substitute for personalised medical advice. Always speak to your prescriber before changing or stopping any medication.

References

• Wilding JPH et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes, Obesity and Metabolism, 2022.
• Aronne LJ et al. Continued treatment with tirzepatide for maintenance of weight reduction: SURMOUNT-4. JAMA, 2024.
• SURMOUNT-4 post hoc analysis of weight regain categories. JAMA Internal Medicine, 2025.
• West S et al. Weight regain after cessation of medication for weight management: systematic review and meta-analysis. BMJ, 2026; 392: e085304. (University of Oxford summary)