[hirundo]

I find these critiques effective:

https://deniseminger.com/the-china-study/

Natural selection seems to have selected us from ancestors that mostly followed herds of ruminants around and ate them in place of vegetation that we can't digest.

[yabudemada]

Absolutely—but they didn't factory farm and the herds of animals were healthy and in their natural habitat. The grand scope of agricultural waste is pretty disgusting. Just look at North Carolina: https://www.ehn.org/hurricane-florence-floods-north-carolina...

Now imagine there was no hog farms and it was all regular plant crops and/or vegetation.