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@hippy
Your brain can only operate on glucose. So, people on high-fat or high-protein diets are going to be less intelligent then people on high-carb or balanced diets. ;)
From memory (and i read this years ago) your muscles can only operate on glycogen (form of carbohydrate) and although your body can convert protein to be used as fuel it's not very efficient.
Carbs ftw (ok ok.. in moderation.. sigh).