[seventhtiger]

I've had the same thought. My pet theory is that digestion is actually a much more exhausting process then we give it credit for, and all the chemical changes happening while you absorb nutrients have a toll on mental energy. Food availability and modern 3 big meals a day culture means we never really have any time when we are not digesting.

After trying fasting, when I see a snake with a full belly sleeping in the grass like it's dead it makes total sense to me. That's what digestion feels like.