What happened?
Research highlighted by NIH compared semaglutide with calorie restriction in older female mice. The investigators reported improvements in several measures of physical and cognitive function. In a separate lifespan experiment, treated mice lived about 100 days longer than untreated animals.
Why does it matter?
The work raises questions about whether some GLP-1 effects extend beyond appetite and glucose regulation. Comparing treatment with reduced calorie intake helps researchers investigate possible mechanisms.
How to interpret the evidence
The experiments involved mice, including a specific age and sex. Animal lifespan results cannot be converted into expected extra years of human life.
What remains uncertain?
This is not evidence that people should take semaglutide solely to slow ageing. Human benefit, safety and appropriate use for that purpose have not been established by this study.
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