Brains run on fat
Low carb diets are not good for your brain. 45-65% of your calorie intake needs to be carbohydrates.
Discussion
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?