Fresh analysis suggests that individuals who discontinue popular weight-loss injections like Mounjaro or Wegovy may regain lost weight at a significantly accelerated pace than those who halt conventional lifestyle regimens.
Research printed in a leading medical journal shows that while obese people can lose substantial amounts of their total mass while on the medication, the weight returns at an average rate of nearly a kilo each month after stopping.
"People using these medications should be informed of the danger of rapid weight regain when the medication ends," stated lead investigator Dr. Susan Jebb.
Such speed of regain suggests a reversion to pre-treatment weight in about 18 months.
Analyzing Treatments
The study, which examined dozens of trials involving thousands of patients, contrasted the effects of GLP-1 agonists with conventional dieting.
The team emphasize that individuals who lose weight through lifestyle changes alone usually experience a more gradual weight regain—perhaps 100 grams monthly—after stopping.
Explaining the Quick Rebound
Nutrition scientists propose the way of the jabs is key to understanding the amplified weight return.
The injections imitate a natural hormone called glucagon-like peptide-1, which moderates hunger.
"Sustained high doses of GLP-1 concentrations several times higher than normal might result in the system to generate a reduced amount of its own natural GLP-1, and could reduce sensitivity to its effects," said Dr. Adam Collins, a nutrition expert.
"Withdrawal of this hormone supplement results in hunger is unsuppressed, making overeating much more probable."
An Ongoing Issue?
Medical guidelines advise the injections for people with weight-linked medical conditions, alongside prescribed diet and exercise modifications.
Many experts contend that, due to the high risk of weight regain, the treatment is often long-term.
This view is reinforced by pharmaceutical companies, who note that the results "emphasize the long-term nature of obesity," comparing it to managing diseases like diabetes.
Patient Accounts
People who have discontinued the medication describe a sudden return of appetite.
"It felt as if a trigger that goes on and you're instantly extremely hungry," recalled an individual.
This difficulty is compounded if patients have not adopted sustainable lifestyle or habit modifications during therapy.
Widespread Interest
Survey data show that millions of adults in the UK have used these injections in the last 12 months, with interest being substantial.
- Adoption is greater among females compared to men.
- The middle-aged demographic shows the highest usage rates.
- A large proportion obtain the drugs through private prescriptions rather than public health services.
Finally, clinicians emphasize that while these medications are potent tools for weight loss, they are not a permanent fix and maintained weight loss relies on integrated behavioural support.
