There is a lot of evidence that cognitive decline is greater in people with insulin resistance. Eating a relatively low sugar/carb diet that doesn't cause blood sugar to spike is probably a good idea.
A better idea is to not develop insulin resistance in the first place and improve sensitivity.I eat 85% carb diet. My blood glucose barely moves up after eating a bunch of straight sugar, then goes back to fasting level after an hour and a half.
How do you improve sensitivity?
Could you provide some references? I'd love to read more about it.