The Study
Association of coffee and genetic risk with incident dementia in middle-aged and elderly adults
This study looked at people who drank different kinds of coffee and saw if they got dementia later, but it didn't make people drink coffee—it just watched what they already did. So it can say coffee and dementia might be linked, but it can't say coffee causes dementia.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
This study looked at what kind of coffee people drank and whether they got dementia later in life, especially if they had a family risk for it.
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 552 / 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 — the type and amount of coffee matter a lot, especially if you have a family history of Alzheimer’s.
- 2People who drank 1–3 cups of ground coffee a day had 22% less dementia and 42% less vascular dementia.
- 3Those who drank more than 6 cups of instant coffee had up to 34% more dementia and 51% more Alzheimer’s.
- 4People with high genetic risk who drank a lot of coffee had 95% higher Alzheimer’s risk.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutritional Neuroscience
Year
2021
Authors
Yuan Zhang, Hongxi Yang, Shu Li, Z. Cao, Wei-Dong Li, T. Yan, Yaogang Wang
Related Content
Claims (6)
Middle-aged and older adults who drink 2 to 3 cups of caffeinated coffee per day have an 18–19% lower risk of developing dementia compared to those who drink less, do not drink coffee, or drink decaffeinated coffee. This association does not occur in women.
People who drink instant coffee have a higher risk of dementia compared to those who drink ground coffee, and this difference is linked to how the coffee is prepared.
People who drink 1 to 3 cups of decaffeinated coffee daily have a higher incidence of dementia than those who do not drink coffee at all.
Middle-aged and elderly adults who drink 1 to 3 cups of ground coffee per day have a 22% lower incidence of dementia and a 42% lower incidence of vascular dementia than those who do not drink coffee.
Adults who drink more than six cups of instant coffee per day have a higher risk of developing dementia and Alzheimer's disease than those who do not drink coffee.
People with a high genetic risk for Alzheimer's disease who drink large amounts of coffee have a 95% higher incidence of Alzheimer's disease than those who do not drink coffee, and their genetic risk changes how coffee affects dementia development.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.