According to Genesis 1:29, when humans were initially created, God commanded us to be vegetarians. I can’t prove it by the bible, but I believe Satan had a back-up plan to get Adam and Eve to violate God’s orders, just in case they refused to eat from the tree of knowledge. I think right outside the Garden of Eden, Satan had built some fast food restaurants in which all of them served meat, and regularly sent Adam and Eve promotional ads. And to further enhance his temptation, I wouldn’t be surprised if he was the original creator of “two for Tuesdays” and free soft drink refills.