Big effect
High green tea intake tied to 36% lower odds of cognitive impairment in meta-analysis — but the evidence is early
This suggests a potentially large protective association, but with only 929 participants across a few studies, the finding needs replication before it can guide recommendations.
In a meta-analysis of 929 people, those who drank the most green tea had a 36% lower risk of cognitive impairment, including dementia and mild cognitive decline. The effect was strongest in people aged 50–69 and in Asian populations. However, the body of evidence is still small, so these results are promising but not definitive.
Where this fits in the evidence
This is among the first studies we've indexed on green tea for Reduced Risk of Cognitive Impairment — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- n = 929
- 2025-02-13
- Neuroepidemiology
- PubMed: 39947165
- DOI: 10.1159/000543784
- Full study breakdown →
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