Good post! I did not until recently that our brain is made up of mostly cholesterol! No wonder Alzheimer’s is more prevalent now with this hysteria about cholesterol.
The issue of low fat foods is also huge. Obesity in America exploded the moment “low fat” foods came into fashion. I know obesity is another issue altogether but low fat foods could indeed be a factor in Alzheimer’s.
There is one more reason why Americans are more prone to Alzheimer’s. Think of what has changed in last 70 years in USA. Automobiles became popular! You will notice a huge segment of older population does no regular exercise. It is akin to driving you car all the time at slow speeds. Sludge builds up in the fuel system. Human body evolved over million years plus. 99.9% of that time our ancestors spent chasing after food relentlessly. They were not farmers and staying in one place. Nomadic life was the norm. So our bodies need exercise. That strengthens your arteries and keeps better blood flow to the brain, kidneys and liver.