Re: "doesn't track", I don't understand how? Humans are not able to ferment plant matter like the big apes, our digestive system is closer to that of a dog. We don't seem optimized for digesting plant matter at all.
You don't need to ferment plants to digest them, we are pretty able to digest plants as seen by all the anecdotes of people living healthily on plant-based diets their whole lives.
It doesn't track that we are not able to live like that. A cat can't, a dog can't, humans can and do.
I said that our preferences was for meat, hence "facultative carnivore". Just like dogs really, and incidentally dog owners who feed their dogs 100% meat will tell you how much healthier they are.
It doesn't track that we are not able to live like that. A cat can't, a dog can't, humans can and do.