Very true. I remember reading a Scientific American article (I think) describing the diet of our ancestors, and what stands out was how much marginal food they ate — food that was not nutritionally dense, not easy to digest, and sometimes borderline toxic. That would be the authentic Paleo diet. I also wrote some of my thoughts about this issue in a less-scientific way in “Why your body wants to be fat” (https://medium.com/@prosetech/why-your-body-wants-to-be-fat-69ea6ae8bbe2).