 And it has a biological premise, and that is when we were able to cut open animals for the first time millions of years ago using stone tools, we basically sliced open all this energy from the ecosystem that we couldn't get with a strictly plant diet or a mixed plant diet. So animal protein, animal fat especially, marrow, organs, they were so nutritious that they basically proteinated us and allowed us to kind of evolve the way we've evolved today, big brained apes.