Ender is now vegan. It proceeded from six or so weeks of being vegetarian.
I'm sorry that you can't live naturally any more
Since when was farming animals, feeding them steroids, and killing the ones they don't need natural?
Nothing we eat is natural. Get over it.
And incidentally, humans didn't even start eating animals until a long way into our existence. If you look at the cuisines of the Chinese, Mediterranean, and middle east, to name a few, you won't see a whole lot of meat (and I mean traditional stuff, not modern). It's only the western Europeans that started doing that.