Moderate coffee and tea intake shows associations with lower dementia risk and better cognitive function.
Evidence from large cohort studies and meta-analyses supports these links, particularly for caffeinated varieties at specific doses.
Dementia Risk Reduction
Higher caffeinated coffee consumption (top vs. bottom quartile) links to 18% lower dementia risk (HR 0.82, 95% CI 0.76-0.89), with 141 vs. 330 cases per 100,000 person-years. Tea intake shows a linear decrease in risk per additional cup daily (RR 0.96, 95% CI 0.94-0.99). Optimal levels are 2-3 cups/day coffee or 1-2 cups/day tea, with U-shaped or nonlinear patterns beyond that.
Cognitive Function Benefits
Caffeinated coffee and tea correlate with lower subjective cognitive decline (prevalence ratio 0.85 for coffee) and modestly better objective scores, like higher TICS (mean difference 0.11). Moderate intake (1-3 cups coffee, moderate/high tea) slows fluid intelligence decline. Decaffeinated coffee lacks these associations.
LINKS below
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Study Type |
Key Finding |
Population/Follow-up |
|
Cohort (JAMA 2026) pubmed |
Coffee/tea moderate intake: lower dementia, better cognition |
131,821 adults; up to 43 years |
|
Meta-analysis (2024) pubs.rsc |
Tea linear risk reduction; coffee 1-3 cups protective |
>450,000; mean 11.5 years |
|
Longitudinal (2025) journals.sagepub |
Slower cognitive decline with moderate coffee/tea |
Not specified in snippet |
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