Massive study suggests common diabetes drug may protect against dementia

This study looked at medical records from over 740,000 older adults with diabetes to see if a drug called semaglutide (used for diabetes) might lower the risk of developing dementia or Alzheimer's disease compared to another class of diabetes drugs (DPP4 inhibitors). The researchers analyzed existing data from Medicare (2008-2019) rather than giving anyone a new treatment. The goal was to find out if repurposing semaglutide could help prevent dementia, but the study only observed patterns—it did not test the drug directly for that purpose.