Carbohydrates are good for your brain! There is no better source of carbs than grains, and breads, tortillas, rolls, and buns don’t make up nearly the daily caloric intake that they get blamed for. So don’t buy into the fad of low-carb diets.

Additional proof comes from studies conducted around the globe that have assessed measures of diet quality. These studies indicate diets containing all of the food groups, including carbohydrate-rich breads and cereals, are associated with lower risks of cognitive impairment, cognitive decline and dementia or AD.
— Grain Foods Foundation