your thinking outside of the box, i like it. Diets are an interesting study for 2 reason. They had way less options, but it appears they had a much better diet (mainly because of our use of sugar, and they ate alot of organ meat which is packed full of vitamins.). They can tell because of how strong there teeth are. they didn't have tooth decay or cavities.

tbh im not quite sure about the pyramids yet. there part of a group of megalithic ruins which there is no inscription or even clear purpose for them. Are they religious? who can say, they have no markings or inscriptions. Humans dont do that, we mark our achievements. Our pride in ingrained in our nature.