New research suggests that people who come off blockbuster weight-loss injections like semaglutide or tirzepatide tend to recover reduced body mass far faster than those who halt conventional diet and exercise programs.
Published data in a prominent medical journal demonstrates that while overweight individuals often shed about a fifth of their body weight while undergoing treatment, the mass returns at an average rate of nearly a kilo each month upon discontinuation.
"Individuals purchasing such treatments must be informed of the danger of quick rebound weight gain when the medication concludes," warns lead investigator Dr. Susan Jebb.
This pace of regain suggests a return to pre-treatment weight within about a year and a half.
Comparing Therapies
The research, which looked at dozens of trials involving over 9,000 of participants, compared the effects of these new drugs with conventional dieting.
Scientists emphasize that individuals who shed pounds through dieting usually see a less rapid weight regain—around 100 grams monthly—post-intervention.
The Reason for the Fast Rebound
Experts believe the mechanism of the drugs is key to understanding the accelerated rebound.
These medications mimic a natural hormone called GLP-1, which controls hunger.
"Sustained high doses of the hormone levels far above than normal could lead to the body to generate a reduced amount of its endogenous GLP-1, and could lessen sensitivity to its actions," explained Dr. Adam Collins, a dietetics researcher.
"Withdrawal of this GLP-1 'fix' means appetite is uncontrolled, making binge eating much more probable."
A Lifelong Disease?
Health authorities advise the jabs for individuals with obesity-related medical conditions, alongside recommended lifestyle changes.
A number of clinicians say that, considering the significant potential of weight regain, the treatment should be considered life-long.
This opinion is supported by drug manufacturers, who note that the results "underscore the persistent nature of excess weight," similar to managing conditions like hypertension.
Patient Experiences
Users who have come off the medication describe a intense return of appetite.
"It felt as if a switch flipping and you become starving," recalled one woman.
This difficulty is worsened if patients have not adopted permanent lifestyle or habit modifications during therapy.
Widespread Use
Figures suggest that a significant number of adults in the UK have used weight-loss jabs in the last 12 months, with demand continuing to grow.
- Adoption is more common among females compared to males.
- The middle-aged age group shows the highest level of interest.
- A large proportion obtain the drugs through private healthcare rather than public health services.
Finally, researchers emphasize that while the jabs are powerful tools for shedding pounds, they are not a standalone fix and long-term success hinges on integrated behavioural management.
