content: The only way to get a human brain is with high levels of DHA and iodine. Grains may have been consumed, but a high seafood intake is necessary to support a brain our size with a tiny gut like we have. Cunanne has developed a full hypothesis of marine/coastline evolution, addressing the issues of the Savannah hypothesis and providing evidence of why coastline evolution is more likely what made us human.  Human Brain Evolution is the book.