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Would you rather be smart, or beautiful?
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Is native intelligence a protection against dementia? Does it lower the odds?
It's more like padding, I was an anorexic teen and young woman so even though I've finally gained weight in midlife and feel fat by my standards, people see me as thin. I'm tall, so even if I lose a couple inches to age I won't be short. If you are very smart, it doesn't prevent dementia, no. It just takes longer to slide from a higher point, you have farther to go, your early dementia isn't going to be as apparent to others.
As far as I know, only physical exercise can prevent it and only for a subset of people. Like, if you keep your heart and circulation healthy, you can prevent it if it's preventable for you personally. Some people are doomed to it from heredity.