Corn and such a new and varied diet, yea. Fish likely played a small role, but that is debated. But I'm wondering which particular foods we adopted from the forest floor into our diet that have drastic effects on consciousness that may be able to explain the rather rapid evolution of our mental capacity vs other primates.
I don't think that the only natural thing we know of today that drastically alters consciousness can be ignored in the potential role it/they played in the sudden evolution of human consciousness. Psychedelics. Mushrooms, peyote, mescalin, DMT, 5-meo-dmt, 4-ho-DMT (psilocin > psilocybin). I can expand on this concept if needs be.