Here's a book that I wish I had 20 years ago, it offers some insight and something you can do:

https://www.amazon.com/End-Alzheimers-Program-Prevent-Cognit...

The protocol isn't wacky, it's just a list of healthy things everyone should do (like getting enough sleep). I've been following much of it myself.

This book https://www.amazon.com/dp/0735216207