Effects of extreme heat on the onset of dementia and all‐cause mortality: A 3‐year follow‐up study in a large population‐based cohort in Japan

Evidence is scarce on the impact of repeated extreme heat exposure on dementia onset. Extreme heat relative to local climate norms was associated with higher odds of dementia onset and all-cause mortality in older adults. Adverse effects appear rapidly, within 1 to 3 years of exposure. Heat adaptation strategies should be incorporated into dementia prevention frameworks.