141
Cases of dementia per 100,000 people each year among U.S. adults who drank higher amounts of caffeinated coffee for up to 43 years of follow-up. That compares with 330 cases of dementia among an equivalent group that rarely or never drank caffeinated coffee.
7.8%
Percentage of U.S. adults who drank higher amounts of caffeinated coffee and reported subjective cognitive decline, compared with 9.5% of those who rarely or never drank it. Decaffeinated coffee did not offer the same benefits.
2–3
Number of cups of caffeinated coffee per day that offered the strongest benefits in terms of dementia risk and cognitive functioning. That association held up regardless of a person’s genetic risk of developing dementia.
1–2
Number of cups of tea per day that offered the strongest benefits in terms of preventing dementia risk and preserving cognitive functioning, though the study did not distinguish between caffeinated and noncaffeinated tea. Drinking higher amounts of caffeinated coffee or tea did not appear to offer additional benefits.
