UT Food Guide
Cans: banana flesh, mushroom, pea soup, ommel cerumen, ommel snot
Bottles: troll blood, healing potion, water, antidote, ommel tears, ommel urine, ommel sweat, Valdemar, Vodka
Food: bananas, kiwis, pineapples, beef, pork, bread
Corpses: puppies, jackals, gibberlings, magpies, rats, bats, hedgehogs, giant musrooms, goblins, kamikaze dwarves, white or grey unicorns, blink dogs, floating eyes, Humans (mages, necromancers, mistresses, dark knights - makes you chaotic),wolves, moose, lions, bears, mammoths
If you have polycontrol: mutant bunnies, mutant asses, magic mushrooms, werewolves
If you are starving (or have antidote): orcs, zombies (makes you chaotic)
Food from the Gods:
Seges (praying fills you to satiated or cures exhaustion if already satiated)
Mellis (pray with empty bottles or cans)
Silva (pray in town kill wolves and eat)
Cruentus (pray to get troll blood)
Nefas (pray to get mistress, eat her banana, take all equipment, then eat her (makes you chaotic)
Loricatus (pray when he is angry to turn what you are wielding into banana flesh)
Magical food sources: wand of polymorph (polypile!), SoCM (make something edible if you are starving to death), scroll of wishing/spirit/genie (if you are starving to death its better to wish for a book of a god that will feed you, than food itself
Fountains
Never eat/drink: Snakes, spiders, kobolds, black unicorns, dark frogs, sulphuric acid, poison