The Hunzas are not vegetarian. They are mostly veg but do eat meat. Alzheimers is now being linked to a form of glucose imbalance of the brain tissue (a form of diabetes so to speak) and not eating meat disease. Yes, there are advantages to eating less meat but to politicize your dinner plate is kind of lame. There are far bigger battles to win than breakfast lunch and dinner. I do agree eating less meat is better and commercial meat is toxic. No doubt. But organic meats are not nearly the same thing and Buddha was not a vegetarian.
Cheers
T.