Consuming 2-3 cups of caffeinated coffee daily reduced dementia risk by 35%
A 43-year Harvard study of 131,821 health professionals found that consuming 2-3 cups of caffeinated coffee daily reduced dementia risk by 35%.
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Coffee and Tea Intake, Dementia Risk, and Cognitive Function
Published 2026Reviewer Insight2/15/2026- Causal language misrepresents observational data: The claim says coffee "reduced" risk, but this study only shows people who drink coffee happen to have lower dementia rates—it cannot prove coffee caused the difference
- Coffee drinkers were different in many ways: People drinking 2-3 cups daily were younger, more educated, more likely to exercise, and had different smoking/drinking habits—any of these factors (or combinations) could explain the lower dementia rates
- The paper itself uses careful language: The authors report an "association" and explicitly state they cannot establish causation, but the claim transforms this into a causal "reduction"
- Awaiting Review
Tea, coffee, and caffeine intake and risk of dementia and Alzheimer's disease: a systematic review and meta-analysis of cohort studies
Published 2024 - Awaiting Review
The effect of daily caffeine use on cerebral blood flow: How much caffeine can we tolerate?
Published 2009
Snapshot built: 2026-06-19