Already told Janic on another subject .... But no, it was the meat lobbies that led them to paint scenes of hunts on the caves ...
And off we go for mockery! Indeed there are hunting scenes painted on the cave, it is an established fact and not disputable. By cons no drawing showing an evolution of brain capacity by cooking food. You see where even this kind of quibbles!
What matters is not what it might or might not have been X or millennia ago, but what it is
currently concerning the sciences, called exact, which are physiology and comparative anatomy which one finds in all good bookstores (according to the formula in question) and especially in the university libraries specialized in these fields.
personally I watch a lot of popular science documentaries on the TV ... Once I saw one or a doctor examining the state of health of a jogger + vegetarian food ... It was final he had the skeleton of a sportsman of the same kind with a balanced omnivorous diet who would be 20 years older ...
But after a western adult with moderate physical activity can do without fish meat 99% of the time I am convinced ... A child or an addo who moves ... With caution ...
Except that you have a speech without personal experience and some documentaries (today on France 5 there was a documentary on excessive sports activities concerning everyone (no indication of VG) which showed what you reported on 1 VG. It goes without saying that it is possible to say as much on 1 "omnivore". It is ridiculous in one case as in the other. To have an acceptable estimate, it is necessary to compare all the VG athletes with non VG; non-specially athletic VGs with the same non-VG population group and see the results. This was done in America by the association of American and Canadian dieticians, that is, a few thousand professionals who analyzed and compared these two populations. Nothing prevents you from consulting their studies. In France it does not exist because the VGs are neither known nor officially listed, so there are only estimates (exaggerated in my opinion) of the assumptions but nothing of usable concrete.
For the precautionary side, when you master the subject enough, there is no risk as this report of the dieticians underlines. Otherwise it would be necessary to take the same precautions for non VG who have for the most part no knowledge in dietetics.