What the trials found
- Semaglutide (STEP 1 extension): one year after stopping, people had regained about two-thirds of the weight they had lost. Improvements in blood pressure and blood sugar also largely reversed.
- Tirzepatide (SURMOUNT-4): after 36 weeks of treatment (about 21% loss), people switched to placebo regained about 14% of their body weight over the next year. Those who continued lost a further 5.5%.
Why the weight comes back
Obesity behaves like a long-term condition, similar to high blood pressure. The medicine adjusts the appetite signals while you take it. When it stops, hunger and food thoughts return to their old level, while the body is now smaller and burns less energy. That gap is where regain comes from. It is biology, not failure.
Planning for it from day one
- Agree the goal early. Is this a defined weight target, or long-term management of a medical condition?
- Build muscle while you lose. Muscle protects your metabolism and your shape. Strength training two to three times a week makes a real difference.
- Fix the habits while appetite is quiet. The treatment window is the easiest time to change how you eat, sleep and move.
- Do not stop abruptly without a plan. Options include stepping down gradually, a lower maintenance dose or longer gaps, decided with your doctor.
- Keep monitoring. Weigh in regularly after stopping, and act early if weight starts to climb.
The honest bottom line
For many people these are long-term medicines, or medicines used in cycles with a clear plan in between. Anyone who promises permanent results from a short course is not giving you the full picture.
Talk it through with a doctor
Whether any of these medicines is right for you depends on your health, your history and your goals. The first phone consultation is free, and there is no obligation.
Book a free consultation