Fresh analysis suggests that people who stop using blockbuster weight-loss injections like semaglutide or tirzepatide may regain reduced body mass far faster than those who halt traditional lifestyle regimens.
Research printed in a leading medical journal points out that while overweight people frequently drop a large proportion of their total mass while undergoing treatment, the mass comes back at an estimated rate of nearly a kilo each month after stopping.
"Users purchasing such medications should be informed of the potential of rapid rebound weight gain when the medication is stopped," stated expert Dr. Susan Jebb.
That rate of regain implies a return to original weight in about 18 months.
Comparing Treatments
The study, which looked at 37 of studies involving thousands of participants, compared the results of GLP-1 agonists with other pills.
Scientists point out that people who shed pounds through diet and exercise generally see a slower weight regain—perhaps 0.1 kg a month—once they finish.
The Reason for the Fast Rebound
Experts believe the way of the injections accounts for the heightened rebound.
The injections mimic a natural hormone called glucagon-like peptide-1, which controls hunger.
"Artificially providing the hormone concentrations several times higher than the body's typical production might result in the system to produce less of its own natural GLP-1, and could reduce sensitivity to its actions," explained Dr. Adam Collins, a nutrition researcher.
"Withdrawal of this GLP-1 'fix' leads to hunger is uncontrolled, making binge eating a significant risk."
A Lifelong Disease?
The NHS advise the jabs for people with weight-linked medical conditions, accompanied by recommended diet and exercise modifications.
A number of clinicians argue that, given the likelihood of relapse, the treatment should be considered ongoing.
This opinion is echoed by drug manufacturers, who note that the results "emphasize the chronic character of excess weight," similar to managing diseases like high blood pressure.
Patient Experiences
People who have stopped the medication report a intense resurgence of hunger.
"It felt as if a switch flipping and you become ravenous," said one woman.
This challenge is worsened if individuals have not adopted permanent lifestyle or habit changes during therapy.
Growing Interest
Recent estimates suggest that a significant number of people in the UK have used weight-loss jabs in the last 12 months, with interest being substantial.
- Adoption is greater among females compared to males.
- The 40s and 50s age group shows the greatest level of interest.
- A large proportion obtain the drugs through private healthcare rather than the NHS.
Finally, clinicians stress that while GLP-1 drugs are potent agents for weight loss, they are not a standalone cure and long-term success hinges on ongoing behavioural changes.
