Orcs would eat...well...anything! Dwarves would eat basically the same as Hobbits, and Men would have Filet Minion with Shoestring fries!
yum! Elves can't eat only Lembas though, they have to have something else. So, mabey Galadriel has a hidden tunnel filled with chocolate. I can just see her stuffing her face with chocolate!
elves probably have similar things to hobbits and men, except in smaller portions. Mabey they don't eat at all! Just kidding. Elves do look very thin though...