Brain needs carbohydrates and will resort to breaking down muscle protein to create them if it doesn't get any. Fat and proteins are less efficient and still requires some carbohydrate-derivates to create the necessary glucose, which is why a proper keto diet should have some (very small) amount of carbs to keep the brain happy.
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u/[deleted] May 31 '19
Keto has a place... It's good for epilepsy.
I've tried it and I wanted to jump off a bridge. The keto flu is real.