Fresh analysis indicates that patients who come off popular GLP-1 drugs like semaglutide or tirzepatide may regain reduced body mass far faster than those who stop conventional diet and exercise programs.
Published data in a prominent medical journal demonstrates that while obese individuals can lose substantial amounts of their body weight while on the medication, the weight returns at an estimated rate of nearly a kilo each month once they quit.
"Users buying such treatments need to be aware of the potential of fast rebound weight gain when the treatment concludes," warns expert Dr. Susan Jebb.
That rate of regain means a reversion to starting weight within about a year and a half.
Comparing Therapies
The analysis, which reviewed 37 of studies involving thousands of patients, contrasted the outcomes of GLP-1 agonists with conventional dieting.
Researchers note that people who lose weight through lifestyle changes alone generally see a slower creep back—around 100 grams monthly—after stopping.
Explaining the Quick Rebound
Doctors propose the mode of action of the injections explains the accelerated regain.
GLP-1 drugs mimic a natural hormone called glucagon-like peptide-1, which moderates hunger.
"Sustained high doses of GLP-1 concentrations far above than the body's typical production might result in the body to produce less of its endogenous GLP-1, and could diminish sensitivity to its effects," said Dr. Adam Collins, a dietetics researcher.
"Stopping of this hormone supplement means hunger is uncontrolled, making binge eating a significant risk."
A Chronic Disease?
The NHS advise the jabs for people with weight-linked medical conditions, accompanied by recommended lifestyle changes.
Professionals say that, due to the high risk of relapse, the therapy should be considered long-term.
This view is reinforced by drug manufacturers, who state that the results "highlight the long-term nature of obesity," akin to managing diseases like hypertension.
Patient Accounts
People who have discontinued the medication explain a intense resurgence of appetite.
"It was like a switch flipping and I was suddenly ravenous," said one woman.
This difficulty is exacerbated if individuals have not established permanent dietary or behavioural changes during therapy.
Growing Interest
Figures show that a significant number of adults in the UK have used weight-loss jabs in the past year, with desire continuing to grow.
- Use is higher among females than males.
- The middle-aged age group shows the highest level of interest.
- Many access the medications through private healthcare rather than public health services.
Ultimately, clinicians caution that while the jabs are effective agents for weight loss, they are not a magic fix and lasting health benefits likely depends on integrated behavioural management.
