Fresh analysis reveals that individuals who discontinue blockbuster weight-loss injections like Mounjaro or Wegovy can put back on reduced body mass at a significantly accelerated pace than those who stop traditional lifestyle plans.
Research printed in a major medical journal shows that while obese individuals frequently drop about a fifth of their body weight while undergoing treatment, the mass comes back at an average rate of nearly a kilo each month after stopping.
"People using these treatments need to be cognizant of the potential of rapid weight regain when the treatment is stopped," warns expert Dr. Susan Jebb.
Such speed of regain suggests a reversion to pre-treatment mass in about 18 months.
Comparing Therapies
The research, which examined 37 of studies involving over 9,000 of patients, compared the results of GLP-1 agonists with older methods.
The team note that individuals who shed pounds through lifestyle changes alone typically experience a more gradual creep back—approximately 0.1 kg a month—after stopping.
The Reason for the Fast Regain
Experts believe the way of the jabs is key to understanding the heightened rebound.
GLP-1 drugs mimic a natural hormone called glucagon-like peptide-1, which helps regulate appetite.
"Sustained high doses of GLP-1 levels far above than the body's typical production could lead to the body to generate a reduced amount of its own natural hormone, and may also diminish sensitivity to its effects," explained Dr. Adam Collins, a dietetics expert.
"Discontinuation of this GLP-1 'fix' leads to appetite is no longer kept in check, making overeating much more probable."
An Ongoing Issue?
The NHS recommend the injections for people with obesity-related medical conditions, alongside recommended diet and exercise modifications.
A number of clinicians say that, due to the significant potential of weight regain, the treatment should be considered long-term.
This perspective is reinforced by drug manufacturers, who note that the results "emphasize the persistent nature of excess weight," similar to managing conditions like high blood pressure.
Patient Experiences
Users who have stopped the jabs explain a powerful return of appetite.
"It was like a trigger that goes on and you're instantly ravenous," said a patient.
The struggle is worsened if users have not established permanent dietary or behavioural modifications during treatment.
Widespread Use
Survey data suggest that millions of people in the UK have tried weight-loss jabs in the last 12 months, with demand continuing to grow.
- Use is more common among females than men.
- The 40s and 50s age group shows the highest usage rates.
- A large proportion access the drugs through private healthcare rather than the NHS.
In conclusion, researchers stress that while the jabs are effective agents for weight loss, they are not a magic cure and lasting health benefits relies on integrated behavioural support.
