The argument was, I believe, against this - > the animals eat that too, which means you eat it It's not true in general, as some things animals eat get digest

The argument was, I believe, against this - > the animals eat that too, which means you eat it It's not true in general, as some things animals eat get digested into other things and don't exist in the animals anymore. Their components do exists, but we don't consider atoms of meat the meat itself.