From the way that story built, this may interest you. We wouldn't be who we are if our hominid ancestors had stayed merely eating fruit and nuts. You can't fuel a human brain on that, and this is why we should be sceptical of vegetarian propaganda. However, the usual explanation is that hominids began to eat more meat (perhaps scavenged from carnivore kills). That might answer the question from the point of view of the energetic situation, but actually this is not going to be just about calories. To have developed a brain the size of ours would have required abundant DHA, AA, I, Fe, Cu, Zn, and Se and the best source of these is seafood. Jack Kruse is a big proponent of this rather elegant explanation of how we came to be who we are in evolutionary terms. Here's one of the researchers in the field. Professor Michael Crawford of Imperial College, London, speaking on the topic:
Seafood Human Evolution & Health with Professor MA Crawford - YouTube
If you're interested this is the book to pick up, unfortunately not cheap, but a must for anyone interested in evolutionary biology:
Amazon.com: Survival of the Fattest: The Key to Human Brain Evolution (9789812561916): Stephen C. Cunnane: Books
BTW, you're the person who mentioned Tai Chi on a thread somewhere, aren't you? I think I remember the avatar. Have you done it long, and do you do much? I've dabbled, but nothing currently.



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