KeptWeight regain after GLP-1s: what the studies show
- STEP 1 extension (semaglutide): about two-thirds of lost weight regained one year after stopping.
- STEP 4 (semaglutide): people switched to placebo after 20 weeks regained 6.9% of body weight over the next 48 weeks.
- SURMOUNT-4 (tirzepatide): people switched to placebo regained 14% of body weight over 52 weeks.
- BMJ 2026 review (37 studies, 9,341 people): about 0.4 kg (0.9 lb) regained per month on average, faster than after diet programs.
If you're searching for how much weight comes back after a GLP-1, you'll find a lot of scary headlines. Here are the actual numbers from the main studies, what they measured, and what they don't tell you.
The four studies worth knowing
| Study | Medicine | What happened after stopping |
|---|---|---|
| STEP 1 extension (2022) | Semaglutide 2.4 mg | About two-thirds of the lost weight regained within one year, on average. |
| STEP 4 (2021) | Semaglutide 2.4 mg | After 20 weeks on the drug, the placebo group regained 6.9% of body weight over 48 weeks. The group that stayed on lost a further 7.9%. |
| SURMOUNT-4 (2024) | Tirzepatide | After 36 weeks on the drug (about 21% lost), the placebo group regained 14% of body weight over 52 weeks. The group that stayed on lost a further 5.5%. |
| BMJ meta-analysis (2026) | All weight-management medicines, 37 studies | Regain of about 0.4 kg (0.9 lb) a month on average, projected back to starting weight in about 1.7 years. About 0.3 kg a month faster than after behavioral programs. |
What that looks like in pounds
Try the weight regain calculator to see these numbers with your own weights.
Take someone who started at 230 lb and lost 40 lb on semaglutide. Two-thirds back in a year would be about 27 lb, or a little over 2 lb a month. The BMJ average of 0.9 lb a month is slower, because it pools many medicines and study designs. Either way, the change on any single day is tiny compared with normal daily swings of 2 to 4 lb from water and salt. That's why regain is so easy to miss until it's large.
Why the weight comes back
- Appetite returns. The drug's effect on hunger and fullness fades, and many people describe food noise coming back.
- Your body defends its old weight. After weight loss, hunger hormones rise and energy use falls a little. This happens after any kind of weight loss, not only with medicine.
- Habits weren't built for "after". Eating less was easier on the drug. Without it, the same plate can feel too small, and portions grow back slowly.
What the studies don't tell you
- They describe averages. In SURMOUNT-4, roughly 46% of the placebo group still kept at least 10% off. Individual results ranged from near-full regain to almost none.
- Most stopped abruptly, and most stopped lifestyle support too. In STEP 1, the lifestyle program ended at the same time as the drug. They don't show what happens when people keep structured habits going.
- They don't test tapering. Gradual dose reduction hasn't been studied the same way. That decision is one for you and your prescriber.
What helps, according to maintenance research
Studies of people who keep weight off long term point to regular self-weighing, consistent eating, daily activity and acting early when weight starts to rise. The common thread is catching drift while it's still a couple of pounds. Our guide on keeping weight off after a GLP-1 turns that into a daily plan.
Common questions
What percentage of people regain weight after stopping Ozempic?
Most people regain some weight. In the STEP 1 extension, people had regained about two-thirds of their lost weight on average one year after stopping semaglutide, though the range between individuals was wide.
How fast do you regain weight after stopping a GLP-1?
A 2026 BMJ review of 37 studies found an average regain of about 0.4 kg (0.9 lb) a month after stopping weight-management medicines, projected back to starting weight in about 1.7 years if nothing else changed.
Do you regain weight after stopping Zepbound or Mounjaro?
In SURMOUNT-4, people switched from tirzepatide to placebo regained 14% of their body weight over 52 weeks on average, while about 46% still kept at least a 10% loss from where they started.
Sources
- Wilding JPH et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes, Obesity and Metabolism, 2022. Link
- Rubino D et al. Effect of continued weekly subcutaneous semaglutide vs placebo on weight loss maintenance (STEP 4). JAMA, 2021. Link
- Aronne LJ et al. Continued treatment with tirzepatide for maintenance of weight reduction in adults with obesity (SURMOUNT-4). JAMA, 2024. Link
- West S et al. Weight regain after cessation of medication for weight management: systematic review and meta-analysis. BMJ, 2026;392:e085304. Link
- Wing RR, Phelan S. Long-term weight loss maintenance. American Journal of Clinical Nutrition, 2005;82(1 Suppl):222S-225S. Link