Fresh analysis suggests that individuals who come off blockbuster GLP-1 drugs like Mounjaro or Wegovy may regain reduced body mass much more quickly than those who stop traditional diet and exercise programs.
Published data in a prominent medical journal shows that while obese people frequently drop about a fifth of their total mass while undergoing treatment, the weight returns at an average rate of 0.8 kg per month once they quit.
"Users purchasing these drugs need to be informed of the risk of quick rebound weight gain when the treatment concludes," warns lead investigator Dr. Susan Jebb.
Such speed of regain means a return to original weight in about a year and a half.
Analyzing Approaches
The study, which examined dozens of trials involving thousands of patients, compared the effects of GLP-1 agonists with older methods.
Scientists emphasize that people who lose weight through dieting usually experience a more gradual creep back—perhaps 100 grams monthly—once they finish.
Understanding the Quick Rebound
Nutrition scientists propose the mode of action of the drugs is key to understanding the accelerated regain.
GLP-1 drugs imitate a body's own chemical called glucagon-like peptide-1, which helps regulate feelings of fullness.
"Sustained high doses of GLP-1 concentrations several times higher than the body's typical production may cause the body to generate a reduced amount of its own natural GLP-1, and may also lessen sensitivity to its effects," explained Dr. Adam Collins, a dietetics researcher.
"Stopping of this hormone supplement means hunger is unsuppressed, making excessive eating much more probable."
A Lifelong Condition?
The NHS suggest the injections for people with weight-linked medical conditions, accompanied by recommended lifestyle changes.
Professionals argue that, considering the high risk of weight regain, the treatment should be considered life-long.
This perspective is supported by drug manufacturers, who note that the results "underscore the persistent character of excess weight," akin to managing diseases like high blood pressure.
User Experiences
People who have stopped the medication explain a powerful return of appetite.
"It felt as if a switch activating and you're instantly ravenous," said one woman.
The struggle is worsened if users have not developed permanent lifestyle or habit changes during therapy.
Growing Use
Figures suggest that a significant number of people in the UK have tried these injections in the last 12 months, with desire continuing to grow.
- Adoption is greater among women than males.
- The middle-aged demographic shows the highest level of interest.
- A large proportion obtain the medications through private prescriptions rather than public health services.
Finally, experts stress that while GLP-1 drugs are powerful agents for weight loss, they are not a permanent cure and long-term success likely depends on ongoing lifestyle changes.
