A recent study suggests that individuals who come off blockbuster GLP-1 drugs like semaglutide or tirzepatide can put back on lost weight far faster than those who end conventional diet and exercise regimens.
Findings released in a prominent medical journal shows that while overweight individuals frequently drop about a fifth of their body weight while on the medication, the mass comes back at an estimated rate of 0.8 kg per month upon discontinuation.
"Individuals buying these treatments should be aware of the risk of fast weight regain when the therapy is stopped," warns lead investigator Dr. Susan Jebb.
Such speed of recovery implies a reversion to pre-treatment mass within about a year and a half.
The analysis, which examined 37 of studies involving over 9,000 of patients, contrasted the results of the injectable medications with other pills.
The team emphasize that individuals who lose weight through lifestyle changes alone generally have a more gradual creep back—perhaps 100 grams monthly—post-intervention.
Doctors suggest the mode of action of the injections explains the accelerated regain.
GLP-1 drugs copy a natural hormone called glucagon-like peptide-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 endogenous GLP-1, and may also reduce responsiveness to its actions," noted Dr. Adam Collins, a dietetics expert.
"Stopping of this GLP-1 'fix' results in hunger is no longer kept in check, making excessive eating far more likely."
The NHS suggest the jabs for people with obesity-related medical conditions, accompanied by recommended lifestyle changes.
A number of clinicians contend that, due to the high risk of weight regain, the therapy might need to be life-long.
This view is supported by drug manufacturers, who note that the results "emphasize the long-term nature of obesity," akin to managing conditions like diabetes.
People who have come off the medication explain a powerful return of appetite.
"It was like a trigger activating and you become extremely hungry," said an individual.
This challenge is compounded if patients have not developed permanent dietary or behavioural modifications during therapy.
Recent estimates show that millions of people in the UK have used weight-loss jabs in the last 12 months, with demand remaining high.
Ultimately, researchers stress that while GLP-1 drugs are potent agents for shedding pounds, they are not a magic fix and long-term success likely depends on combined behavioural management.
En politisk analytiker med över 15 års erfarenhet av svensk offentlig förvaltning och samhällsdebatt.
Joseph Brown
Joseph Brown
Joseph Brown
Joseph Brown
Joseph Brown