Some years ago, I came across a paper suggesting something similar, except that the key dietary change was when an ancestor hominin (I don't recall which, if th

Some years ago, I came across a paper suggesting something similar, except that the key dietary change was when an ancestor hominin (I don't recall which, if they identified a specific one) switched from a largely fish-based diet to one of land mammals. The paper seemed to take as as established fact that there was, at one time, a hominin with a fish-based diet. I have not been able to track down this paper again, but the idea that adopting an aquatic diet was a step in the evolution of homo sapiens seems to be 'in the air'; this paper seemed to be saying that a subsequent switch away from that diet was also important. IIRC, it included both a nutritional argument, and the point that it allowed this hominin to spread beyond lake-shores and coastlines.