There's a topic called "blue zones" which examines regions where people live healthy dementia free for far longer than surrounding communities. it's not clear

There's a topic called "blue zones" which examines regions where people live healthy dementia free for far longer than surrounding communities. it's not clear how much research is active, but it is an investigated topic. https://en.wikipedia.org/wiki/Blue_zone https://en.wikipedia.org/wiki/Blue_zone