The Study
Association between coffee and tea consumption and the risk of dementia in individuals with hypertension: a prospective cohort study
This study noticed that people who drank a little coffee or tea seemed to get dementia less often, but it didn't make people drink more or less—it just watched what they already did. So we can't say the coffee or tea caused the lower risk; maybe those people were just healthier in other ways.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
If you have high blood pressure, drinking a little coffee or tea every day might help your brain stay healthier longer.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 559 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — for someone with high blood pressure, having 1 cup of coffee or 4–5 cups of tea daily could cut dementia risk by about a quarter, and combining both could cut it by nearly half.
- 2People with high blood pressure who drank 0.5–1 cup of coffee or 4–5 cups of tea daily had the lowest risk of dementia.
- 3Drinking too much or too little raised the risk.
- 4Ground coffee was better than decaf.
- 5Drinking both coffee and tea together gave even more protection.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Scientific Reports
Year
2024
Authors
Bo Wang, Ting Ma, Lingling Yang, Shulan He, Jiangping Li, Xian Sun
Related Content
Claims (6)
In people with high blood pressure, drinking 4 to 5 cups of tea daily is linked to a 25.6% lower rate of all-cause dementia than not drinking tea, and the lowest dementia risk occurs at this level of intake; both less and more tea are linked to higher risk.
People with hypertension who drink ground coffee have a lower risk of developing all-cause dementia and vascular dementia than those who drink decaffeinated coffee.
People with high blood pressure who drink half a cup to one cup of coffee per day have a 26.7% lower rate of all-cause dementia than those who drink six or more cups per day.
Among people with high blood pressure, consuming 100–200 mg of caffeine per day is linked to the lowest risk of dementia from any cause or from vascular problems; less or more caffeine is linked to higher risk.
People with high blood pressure who drink coffee or tea have a lower risk of dementia compared to people with high blood pressure who do not drink coffee or tea.
People who drink two to three cups of coffee each day have the lowest risk of developing dementia compared to those who drink less or more.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.