New research indicates that individuals who stop using blockbuster weight-loss injections like semaglutide or tirzepatide may regain reduced body mass at a significantly accelerated pace than those who end traditional diet and exercise plans.
Published data in a leading health publication points out that while overweight individuals often shed a large proportion of their total mass while undergoing treatment, the weight returns at an average rate of 0.8 kg per month once they quit.
"Individuals purchasing such medications should be cognizant of the danger of rapid weight regain when the medication is stopped," warns lead investigator Dr. Susan Jebb.
This pace of regain suggests a reversion to pre-treatment weight in about 18 months.
Weighing Treatments
The study, which looked at 37 of studies involving thousands of patients, compared the effects of GLP-1 agonists with older methods.
Researchers note that individuals who shed pounds through lifestyle changes alone typically experience a slower weight regain—around 100 grams monthly—once they finish.
Explaining the Rapid Rebound
Nutrition scientists suggest the mode of action of the drugs accounts for the amplified weight return.
GLP-1 drugs imitate a natural hormone called GLP-1, which helps regulate feelings of fullness.
"Long-term administration of GLP-1 concentrations several times higher than the body's typical production may cause the system to generate a reduced amount of its own natural GLP-1, and could reduce sensitivity to its effects," noted Dr. Adam Collins, a dietetics specialist.
"Stopping of this medication leads to hunger is uncontrolled, making overeating much more probable."
A Lifelong Disease?
The NHS advise the injections for individuals with obesity-related health risks, alongside prescribed diet and exercise modifications.
Many experts contend that, given the high risk of weight regain, the treatment is often life-long.
This view is echoed by drug manufacturers, who state that the results "emphasize the long-term nature of excess weight," comparing it to managing diseases like hypertension.
Patient Accounts
People who have come off the medication explain a intense return of hunger.
"It felt as if a switch flipping and you become extremely hungry," described an individual.
The struggle is compounded if patients have not established sustainable dietary or behavioural changes during therapy.
Widespread Adoption
Survey data suggest that millions of adults in the UK have tried weight-loss jabs in the past year, with desire being substantial.
- Adoption is more common among women than males.
- The 40s and 50s age group shows the greatest usage rates.
- A large proportion obtain the medications through private healthcare rather than the NHS.
Ultimately, experts emphasize that while the jabs are potent agents for weight loss, they are not a magic solution and maintained weight loss relies on integrated lifestyle changes.
