People who drink caffeinated coffee have a lower incidence of dementia compared to those who do not, while people who drink decaffeinated coffee show no difference in dementia incidence.
Strongly supported
Multiple high-quality studies back this claim.
Not medical advice. For informational purposes only. Always consult a healthcare professional.
People who drink caffeinated coffee have a lower incidence of dementia compared to those who do not, while people who drink decaffeinated coffee show no difference in dementia incidence.
See the technical phrasing
Caffeinated coffee consumption is associated with a reduced risk of dementia, while decaffeinated coffee consumption is not associated with a reduced risk of dementia.
Caffeine blocks a brain signal that causes inflammation and slows down brain cell repair. This reduces harmful protein buildup, boosts a protein that keeps brain cells healthy, and improves blood flow to the brain. Without caffeine, these protective effects do not occur, so dementia risk stays higher.
What the research says
Supports
3 studies
Study: Moderate coffee and tea consumption is associated with slower cognitive decline
People who drank a moderate amount of coffee (1–3 cups a day) had slower mental decline over time, which suggests coffee might help protect the brain. But the study didn’t check if decaf coffee has the same effect, so we can’t say for sure whether it does or doesn’t.
Study: Associations of Individual Beverage Types and Substitution with Dementia Risk: A UK Biobank Cohort Study
This study found that people who drank coffee were less likely to get dementia, which supports the idea that coffee might help protect the brain. But it didn’t specifically check if caffeinated coffee is better than decaf, so we can’t be 100% sure.
Study: Coffee and Tea Intake, Dementia Risk, and Cognitive Function.
People who drink caffeinated coffee regularly have a lower chance of getting dementia than those who don’t, but people who drink decaf coffee don’t show that same benefit — so the caffeine might be what’s helping.
Contradicts
0 studies
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 3 supporting studies