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Apparently Clark/Superman eventually went vegetarian in the Birthright comic after he gained the ability to see auras of humans and animals. This power let him see the life force of creatures fade as they died so he switched to a vegetarian diet. Now I don't know how expansive this change is. Comics have so many alternate universes and aurora and rewrites that it may only be in some comics that he's vegetarian. But it's something.

No wonder he is so STRONG, he is a vegetarian.

He eats junk food....I saw one Superman eating a hot dog, too! hehehe (The new adventures of superman, version) ...lol

That crap he has probably has Gelatin and cheap chicken chunks in it....