New research suggests that people who discontinue blockbuster weight-loss injections like semaglutide or tirzepatide can put back on lost weight at a significantly accelerated pace than those who end conventional lifestyle regimens.
Published data in a major medical journal shows that while overweight individuals can lose substantial amounts of their total mass while using the jabs, the mass is regained at an estimated rate of nearly a kilo each month upon discontinuation.
"People using these treatments must be cognizant of the risk of fast rebound weight gain when the treatment ends," warns researcher Dr. Susan Jebb.
This pace of regain means a reversion to starting mass in about one and a half years.
Comparing Approaches
The analysis, which examined dozens of trials involving over 9,000 of participants, contrasted the outcomes of these new drugs with older methods.
Scientists emphasize that people who shed pounds through dieting typically see a less rapid creep back—perhaps 0.1 kg a month—post-intervention.
The Reason for the Quick Regain
Nutrition scientists propose the mode of action of the jabs is key to understanding the heightened regain.
The injections mimic a natural hormone called glucagon-like peptide-1, which moderates appetite.
"Sustained high doses of GLP-1 levels far above than normal might result in the body to generate a reduced amount of its own natural hormone, and could lessen sensitivity to its effects," said Dr. Adam Collins, a dietetics expert.
"Withdrawal of this hormone supplement means hunger is uncontrolled, making overeating far more likely."
A Lifelong Disease?
Medical guidelines suggest the injections for individuals with obesity-related medical conditions, accompanied by prescribed lifestyle changes.
A number of clinicians say that, due to the significant potential of weight regain, the therapy might need to be long-term.
This view is supported by drug manufacturers, who state that the findings "emphasize the long-term nature of excess weight," comparing it to managing conditions like high blood pressure.
Patient Accounts
Users who have come off the medication describe a intense resurgence of cravings.
"It was like something flipping and you become ravenous," recalled a patient.
This difficulty is worsened if patients have not established permanent dietary or behavioural modifications during treatment.
Growing Adoption
Survey data show that a significant number of adults in the UK have used weight-loss jabs in the last 12 months, with desire remaining high.
- Adoption is more common among women compared to men.
- The middle-aged demographic shows the greatest level of interest.
- Many obtain the drugs through private healthcare rather than public health services.
Finally, experts caution that while these medications are powerful tools for weight loss, they are not a standalone cure and long-term success relies on integrated behavioural changes.
