Low carb diets are not good for your brain. 45-65% of your calorie intake needs to be carbohydrates.
Discussion
Brains run on fat
No they don’t. They run on glucose
Everything runs on glucose if that’s what the fuel is. Humans lived for centuries without ample access to carbs. How can we fast for several days and not immediately die? Why do infants need mothers milk, which is nearly 100% fat?
You might want to research glucogenesis. The process by which protein is turned into bioavailable sugars.
I hear that dementia is a disease where the brain is incapable of absorbing the carbohydrates a person eats. What do you recommend in that case? How much of a person's diet should be carbs if none of them end up being absorbed?