Under 42 minutes of bright daylight a day linked to higher dementia risk

A study of 87,577 adults who wore light-tracking wrist devices found higher daytime light exposure was linked to a 16% lower risk of dementia, with longer bright-light exposure tied to bigger reductions. Getting less than 42 minutes of bright daylight daily was a stronger predictor of dementia than six established risk factors, according to the research in General Psychiatry.