I KNOW he was Vegetarian, at least....defiantly. He went Vege during the Goonies, actually. He wanted to be Vegetarian for a while, but as far as I remember his parents didn't make it that easy for him...
. . .(scroll right to the last question).
Also heres a recent interview from Corey, saying he is Vegetarian: -
. . Correct me if I'm wrong. :)