Moderate Coffee or Tea Tied to Lower Dementia Risk Over Four Decades

TL;DR Summary
A 43-year cohort of 131,821 NHS and HPFS participants found that moderate caffeinated coffee (2–3 cups/day) or tea (1–2 cups/day) was linked to an 18% lower dementia risk and better cognitive performance, with decaffeinated coffee showing no similar benefit and effects observed across varying genetic risk; caffeine is suspected to play a key role and the benefits were strongest at the cited intake levels.
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