A large-scale study suggests that GLP-1 drugs like semaglutide could have unexpected mental health benefits beyond their widely known weight loss and diabetes effects. The large register-based analysis followed nearly 100,000 individuals using Swedish national registers from 2009 to 2022, including more than 20,000 people who used GLP-1 medications. Researchers from the University of Eastern Finland, Karolinska Institutet in Stockholm, and Griffith University in Australia conducted the analysis.
The findings showed that GLP-1 medication use, especially semaglutide, was associated with fewer psychiatric-related hospitalizations and sick leave. During periods when participants used semaglutide, these risks were 42% lower compared with periods without GLP-1 treatment. The risk of depression dropped by 44%, while anxiety disorders decreased by 38%. Semaglutide use was also linked to a lower risk of substance use disorders, with hospital care and sick leave related to substance use 47% lower during treatment periods. GLP-1 receptor agonists were associated with a reduced risk of suicidal behavior.
Researchers noted that while the strength of the association surprised them, the results were not entirely unexpected. Previous research examining Swedish registers found GLP-1 medications associated with reduced risk of alcohol use disorder. Professor Mark Taylor from Griffith University stated: “Alcohol-related problems often have downstream effects on mood and anxiety, so we expected the effect to be positive on these as well.”
While the registry-based study cannot determine exactly why or how these medications affect mood symptoms, researchers suggested several mechanisms. Possibilities include reduced alcohol consumption, weight loss-related improvements in body image, relief from better glycemic control in diabetes, and potential direct neurobiological mechanisms through changes in the brain’s reward system. The study was published in The Lancet Psychiatry in April 2026.
This article is an AI-assisted summary. All facts and figures are drawn from the original report: https://scitechdaily.com/semaglutide-shows-surprising-mental-health-benefits-in-massive-100000-person-study/