GLP-1 weight-loss drugs put teenagers at a developmental crossroads

A University of Georgia review says GLP-1 medicines can help adolescents with severe obesity, but warns that their effects on growth, brain development, mental health and muscle mass remain uncertain.

GLP-1 medicines have rapidly moved from diabetes care into the centre of the weight-loss debate, but a new University of Georgia review suggests their use in teenagers remains more complicated than the growing demand around them. According to the review, certain GLP-1 drugs are approved for adolescents aged 12 and older who continue to have obesity after lifestyle changes have not worked, yet questions remain about how these medicines may affect physical growth, brain development and mental health during a period when the body is still changing.

Emily Noble, a nutritional neuroscientist and associate professor at the University of Georgia, said obesity in adolescence often continues into adulthood and can be extremely difficult to reverse once it has taken hold. She argued that weight regulation is not simply a matter of willpower, but is shaped by biological processes in the brain that can make weight loss hard to sustain without medical help. That view helps explain why clinicians sometimes turn to GLP-1 treatment for young people with severe obesity, even as public discussion often frames the drugs as a quick fix.

The medicines work by imitating a natural gut hormone that helps lower blood sugar, increases the feeling of fullness and slows digestion. The information provided by GLP-1 educational groups notes that Wegovy and Saxenda are approved for adolescents, while Zepbound is not yet approved for that age group. Those same summaries say trials such as STEP TEENS found meaningful weight loss in teenagers taking GLP-1 therapy compared with placebo, which has fuelled interest in the drugs as a treatment option for youth struggling with obesity.

Still, Noble warned that the long-term consequences are not well understood. The main concern, she said, is what happens when these medicines are used during a sensitive stage of development, when puberty, brain maturation and changes in body composition are all taking place at once. She also raised the possibility that some adolescents may lose muscle as well as fat, and said repeated cycles of weight loss and regain could leave some young people worse off than if they had never taken the medication.

For parents, Noble said the first step is to work closely with a doctor, though she added that a second opinion can be worthwhile. GLP-1 drugs can be useful, but weight often comes back after treatment stops, and families should weigh that against the known harms of untreated obesity, including longer-term effects on metabolism and brain health. She said prevention remains the best strategy, with regular physical activity, less sedentary time, family meals and healthy eating habits offering the strongest protection over the long term.