A recent study reveals that individuals who discontinue blockbuster GLP-1 drugs like semaglutide or tirzepatide can put back on reduced body mass much more quickly than those who stop traditional lifestyle plans.
Research printed in a leading medical journal points out that while obese people frequently drop about a fifth of their body weight while undergoing treatment, the weight returns at an estimated rate of 0.8 kg per month after stopping.
"Individuals buying these treatments need to be cognizant of the risk of fast weight regain when the therapy ends," cautioned lead investigator Dr. Susan Jebb.
This pace of regain means a return to starting mass in about 18 months.
Weighing Therapies
The analysis, which looked at 37 of studies involving thousands of participants, contrasted the outcomes of these new drugs with conventional dieting.
The team note that individuals who shed pounds through diet and exercise typically see a more gradual creep back—around 100 grams monthly—after stopping.
The Reason for the Rapid Rebound
Nutrition scientists believe the mode of action of the jabs accounts for the amplified weight return.
These medications mimic a body's own chemical called glucagon-like peptide-1, which controls appetite.
"Long-term administration of the hormone concentrations far above than normal may cause the system to produce less of its endogenous GLP-1, and may also reduce responsiveness to its actions," noted Dr. Adam Collins, a nutrition researcher.
"Stopping of this medication means hunger is no longer kept in check, making excessive eating much more probable."
An Ongoing Condition?
Medical guidelines suggest the injections for people with weight-linked health risks, alongside recommended diet and exercise modifications.
Professionals argue that, given the likelihood of relapse, the therapy should be considered life-long.
This opinion is echoed by drug manufacturers, who say that the findings "underscore the long-term nature of excess weight," comparing it to managing conditions like hypertension.
Patient Experiences
Individuals who have discontinued the jabs describe a sudden resurgence of appetite.
"It felt as if a switch that goes on and you become extremely hungry," described one woman.
The struggle is worsened if individuals have not developed permanent dietary or behavioural changes during therapy.
Widespread Interest
Figures suggest that millions of people in the UK have used these injections in the past year, with interest being substantial.
- Use is higher among women compared to males.
- The 40s and 50s demographic shows the highest level of interest.
- Many access the drugs through private healthcare rather than the NHS.
Finally, clinicians emphasize that while these medications are effective agents for weight loss, they are not a magic fix and long-term success relies on ongoing behavioural support.
