Metformin has been prescribed to people with type 2 diabetes to manage blood sugar for more than 60 years, but scientists haven't been exactly sure how it works. A recent study suggests it works directly in the brain, which could lead to new types of treatment. Researchers from the Baylor College of Medicine in the US identified a brain pathway that the drug seems to work through, in addition to the effects it has on biological processes in other areas of the body. "It's been widely accepted