Weight regain

Weight regain is the return of lost weight after an intervention ends. It is the normal, expected pattern rather than a personal failure: the body defends its previous weight through increased appetite and a lower energy expenditure than size alone predicts.

It matters because it reframes what these treatments are. In the off-treatment extension of the semaglutide STEP 1 trial, participants regained about two-thirds of their lost weight in the year after stopping, and cardiometabolic improvements moved back towards baseline with it — the pattern of a chronic condition being managed, not cured.

In practice, this is why clinicians frame weight management as long-term, and why the habits built alongside any treatment — resistance training, protein, sleep, food environment — matter for what happens when it stops.

Sources

• Wilding JPH, et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes Obes Metab 2022;24(8):1553-1564; PMID 35441470