A very interesting talk by Lisa Genova (author of "Still Alice") on how Alzheimer's can be prevented. Worth watching if only for the explanation of the neurological changes that take place in the brain. I came across it on Facebook as a post from the Brain and Spine Foundation.
https://www.ted.com/talks/lisa_genova_what_you_can_do_to_prevent_alzheimer_s#t-824215
https://www.ted.com/talks/lisa_genova_what_you_can_do_to_prevent_alzheimer_s#t-824215