Quite an interesting article. You touch on something in the end: that the Mongol horde was fed on meats and yogurt, while the peasants they so easily slaughtered ate grain porraige. It doesn't make one wonder which sort of people a government would have an easier time ruling.
Well said, with carb based nutrition it appears to be more cheap and sustainable for large populations so would flipping this paradigm ever be practically possible? I don't know but I believe an educated society is a dangerous one and that we deserve better for ourself overall.