Basal metabolic rate for people of average height and weight is typically lower than 2000kcal. It’s been a long time since I calculated this, but when I was in my late 20s, ~5’11 and ~70kg, I think my BMR was around 1600kcal. In my college nutrition course, we were taught that that ~130g of carbohydrate go towards brain function, so that was ~30% of my baseline energy needs going directly toward basic brain function.
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