Fresh analysis indicates that individuals who stop using blockbuster GLP-1 drugs like Wegovy and Mounjaro tend to recover lost weight at a significantly accelerated pace than those who stop traditional lifestyle regimens.
Published data in a major health publication shows that while obese individuals frequently drop about a fifth of their body weight while using the jabs, the mass comes back at an average rate of nearly a kilo each month after stopping.
"Individuals using such treatments must be informed of the danger of rapid weight regain when the medication concludes," warns lead investigator Dr. Susan Jebb.
That rate of regain means a return to pre-treatment mass within about one and a half years.
The study, which examined dozens of studies involving thousands of participants, compared the outcomes of these new drugs with conventional dieting.
Researchers note that individuals who lose weight through diet and exercise typically have a slower weight regain—approximately 0.1 kg a month—post-intervention.
Experts suggest the mechanism of the jabs is key to understanding the amplified regain.
The injections mimic a natural hormone called GLP-1, which helps regulate feelings of fullness.
"Artificially providing GLP-1 levels far above than the body's typical production may cause the body to produce less of its endogenous hormone, and could lessen responsiveness to its actions," explained Dr. Adam Collins, a nutrition expert.
"Stopping of this hormone supplement results in hunger is no longer kept in check, making overeating far more likely."
Medical guidelines suggest the injections for individuals with obesity-related medical conditions, alongside prescribed lifestyle changes.
Professionals contend that, considering the high risk of weight regain, the treatment should be considered long-term.
This view is supported by pharmaceutical companies, who state that the findings "underscore the chronic nature of excess weight," similar to managing diseases like hypertension.
Users who have discontinued the medication describe a powerful resurgence of appetite.
"It was like a switch activating and you become ravenous," said a patient.
The struggle is worsened if patients have not established permanent lifestyle or habit changes during therapy.
Figures show that a significant number of adults in the UK have tried weight-loss jabs in the last 12 months, with interest remaining high.
In conclusion, researchers emphasize that while the jabs are powerful tools for weight loss, they are not a standalone cure and maintained weight loss hinges on ongoing behavioural changes.
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