What we had access to during our evolution tells us very little about what’s healthy. Back when I bought into the whole paleo thing, I read Food and Western Disease, and Lindberg made a huge deal of how the Trobriand Islanders ate coconuts and seemed to do fine (although you would expect any population to seem to do “fine” when the weaker 50% dies every generation before reproductive age, as is the case with pre-industrial societies)