I may revise my opinion if conflicting results come in, but for now, I’m choosing to believe that this is 100% on the money:

Among 6,001 Health and Retirement Study participants in the U.S., drinking two or more cups of coffee a day was associated with a 28% lower risk of dementia over 7 years compared with drinking less than one daily cup (P<0.05), reported Changzheng Yuan, ScD, of the Harvard T.H. Chan School of Public Health in Boston and the Zhejiang University School of Medicine in China, in a poster presented at the meeting. …

When total caffeine intake derived from coffee and tea was calculated, participants in the highest quartile of caffeine consumption had a 38% decreased risk of dementia (P=0.032), Yuan and co-authors said.

At the very least, people should have learned by now to be cautious about accepting or rejecting proclamations about what is or isn’t good for us, with especial wariness when the instruction is to stop doing something you like.

Generally, I’ve found that “believers in science” don’t seem to appreciate the complex ways in which our bodies were conditioned through evolution to interact in complex, overall beneficial, ways with substances we enjoy.