Interesting insight into evolution, but it doesn't say anything about what we should eat today. In evolutionary times, gathering plant material and chewing and swallowing enough of it to survive took a lot of energy. Today, we get more than enough. We have "big guts" in a different sense and for a different reason. So burning extra calories digesting low-calorie plants is probably a good idea.
By the way, if the brain uses 20 times as much energy as the equivalent amount of muscle, why can't we lose weight by thinking hard?
Does anybody but a few survival enthusiasts have the know-how to live on what they can forage?
Who are you to decide which life is killable for sustenance?
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