I ran across this recent study that finds a correlation between caffeine intake from coffee and tea and significant lower dementia incidence. 2 to 3 chips of coffee and 1 to 2 cups of tea seen to be the optimum dose. At least I'm doing something right with my health...
https://jamanetwork.com/journals/jama/article-abstract/2844764
https://jamanetwork.com/journals/jama/article-abstract/2844764
Findings In this prospective cohort study of 131 821 individuals from 2 cohorts with up to 43 years of follow-up, 11 033 dementia cases were documented. Higher caffeinated coffee intake was significantly associated with lower risk of dementia. Decaffeinated coffee intake was not significantly associated with dementia risk.
Meaning Higher caffeinated coffee intake was associated with more favorable cognitive outcomes.