I don’t know what his actual diet is, but in general I would say that his body is undernourished and he is doing all of this in spite of his diet, and that given a long enough time frame, he will have health consequences. A lot of people claim to be vegan/vegetarian but still eat eggs or dairy, supplement with protein, or other things that can make up for some amount of the missed benefits of meat. However, they are still performing below their body’s peak potential.