We’re still figuring out the side effects of GLP-1 weight-loss drugs

MIT Technology Review · Jessica Hamzelou · 2026-10-09 09:00 UTC

Could the drugs affect hair, nails, and vision?

Could the drugs affect hair, nails, and vision?

This week my colleague Antonio Regalado had an interesting update on GLP-1 weight-loss drugs. According to research presented at an aging meeting in Boston, these drugs seem to affect at least some measures of biological age.

Overweight and diabetic people who take GLP-1s have a biological age around two to three years younger than similar individuals who take a placebo, according to findings from Eli Lilly and Novo Nordisk, two pharmaceutical companies that make the drugs.

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