I stopped eating meat for ethical reasons, and after a couple of decades it makes me ill, presumably because my gut flora no longer tolerates it. So any reason

I stopped eating meat for ethical reasons, and after a couple of decades it makes me ill, presumably because my gut flora no longer tolerates it. So any reason to not eat meat can become a health-related specification, given time. From the sounds of it I'm nowhere near as sensitive to it as you and bifrost.