Seen a few critical posts mentioning that humans are meant to be omnivores etc. Personally that's the reason that I am trying to limit my meat intake. Will probably never be a veggie, but I am well aware that the crazy amounts of meat I was eating are no good for myself or the planet.
I'd imagine that our ancestors ate vastly less amounts of meat than most of us do now. The huge amounts of meat and dairy consumed by many certainly aren't our 'natural diet' as humans