->''"You are what you eat" said a wise old man,''
->''Lord, if that's true I'm a garbage can.''
-->-- '''Victor Buono''', "The Fat Man's Prayer"

"You are what you eat", as the saying goes. In fiction, this is often taken literally, with a character eating something that causes them to transform into whatever it was they just ate, or the creature it came from (for example, a character may start growing feathers after eating a chicken egg). Can be a source of NightmareFuel when used in a children's show.

This is often given some sort of HandWave in that the food was genetically modified[=/=]exposed to radiation[=/=]infected with TheVirus[=/=]of alien origin[=/=][[ArsonMurderAndJaywalking past its use-by date]].

This trope may also apply to abilities and behaviour associated with the food source, for example, eating brains may supposedly make one more intelligent, or eating a beef patty may make them start mooing and eating grass.

Note that this differs from YouAreWhoYouEat, in that the latter trope is about characters who can do this with their food as an inherent ability. This trope is for when the food itself has these special properties.

A newly-transformed sentient pile of food will often discover that it [[ITasteDelicious tastes delicious ]]. See also: CerealInducedSuperpowers. A SisterTrope of MayContainEvil. Can occur because of TamperingWithFoodAndDrink.



[[folder: Anime and Manga ]]
* Tamaki Amajiki[=/=]Suneater from ''Anime/MyHeroAcademia'' has a superpower kwnow as "Reappearance", which allows him to change parts of his body into the body parts of things that he eats. His power also works as a form of PowerCopying: if he eat part of his oponent's body, he will gain their superpowers.
* Wapol from ''Franchise/OnePiece'' can do this thanks to eating the Munch-Munch Fruit (''Baku Baku no Mi'').

[[folder: Comic Books ]]
* ''ComicBook/TheSmurfs'' comic book story "Salad Smurfs" had the Smurfs turning into AnthropomorphicFood from eating magically-treated giant vegetables.
* ''ComicBook/ThargsFutureShocks'': In one comic set in the future humans hunt down ugly-looking snot aliens who mysteriously reproduce en masse by eating their eggs. Which naturally turns out to be the very thing that turns others into new aliens.

[[folder: Film ]]
* The titular monster in John Carpenter's ''Film/TheThing1982'' is like a [[TheVirus virus]], it can infect people by merely touching them. Since small particles are enough to take over a body, one of the scientists suggests that everyone prepare their own food and eat out of cans in order to prevent contamination via the digestive system.

[[folder: Literature ]]
* In "Royal Jelly", a short story by Creator/RoaldDahl, the eponymous substance [[spoiler:slowly transforms a baby into a ''Queen bee'' larva. Did wonders for her dad, too]].
* In Creator/StephenKing's short story "Grey Matter", [[spoiler:a can of contaminated beer turns a man into a BlobMonster]].
* In a roundabout way this happens in ''Literature/DrFranklinsIsland''. Semi, at that point a small manta ray-like creature, is presented with the chance to become human again. To that end powder is poured into her pool, and she notes that consuming it is just like consuming plankton - like breathing, basically. She and Miranda speculate that the powder is [[LEGOGenetics dried up human DNA]].

[[folder: Live Action TV ]]
* ''Series/DoctorWho'':
** In the serial "[[CharacterNameAndTheNounPhrase Delta and the Bannermen]]" a character called Billy [[TooDumbToLive intentionally]] eats some "[[MutagenicGoo royal jelly]]" so he can [[BeingHumanSucks turn into an alien]] to be with the CuteAlienGirl he has [[LoveAtFirstSight fallen in love with]] and [[AdamAndEvePlot repopulate her race]] with her. And they lived HappilyEverAfter.
** In "Planet of the Ood", Ood Sigma slowly turns Halpen into an Ood by spiking his hair tonic.
* In ''Series/{{Thats So Raven}}'' Chelsea accidentally ate a hamburger on Halloween. It starts a chain of events that results in her and Raven turning themselves into cows.
* A recurring sketch in ''Tittybangbang'' featured a family obsessed with eating nothing but duck and chips. In one sketch the dad has eaten so much of it that he lays a duck's egg and a baby duck hatches. He's undeterred, and resolves to eat ''more'' duck and chips so he can provide a constant supply of duck for his family.

[[folder: Stand Up Comedy ]]
* Creator/BillCosby named a book ''[[http://www.amazon.com/Am-What-Ate-Im-Frightened/dp/0060545739/ref=sr_1_1?ie=UTF8&qid=1319749363&sr=8-1 I Am What I Ate...and I'm Frightened!!!]]''

[[folder: Video Games ]]
* A character in ''VideoGame/ChronoCross'' ("[[PunnyName Funguy]]") eats a special mushroom that [[BalefulPolymorph transforms]] him into a half-human, half-mushroom person.
* Some raw meat chunks in ''VideoGame/DungeonCrawl'' can cause a random mutation if eaten. They are thankfully labeled as such and prompt a warning if you try to eat it.
* Monster meat in the ''VideoGame/ShirenTheWanderer'' series transforms you into the monster the meat came from, giving you all of the powers of the original monster. You can also use the meat on enemies by throwing it at them; this can be exploited by throwing meat from TheGoomba. Of course, monsters don't drop this meat normally; you have to kill them with Bufu's Staff, or better, Bufu's Cleaver, neither of which are easy to get.
* ''Corruption of Champions'' has this as a major game mechanic. Various items and potions can bestow transformations on you, slowly turning you into animal or monstrous forms representative of their origin. "Canine Peppers", for example, subtly alter your physiology into a more... canine form, while "Whisker Fruit" makes you more catlike. Items of opposed species will soon cancel out each other's transformations- and overdosing on certain transformation items will [[BalefulPolymorph turn you permanently]] into that animal, resulting in a bad ending for you.
* The ''[[Franchise/SaGaRPG SaGa]]'' series has edible monster meat. In some games it can turn any character into a monster (opposed by cybernetics/robotic upgrades), and in all titles it allows monsters to grow more powerful and/or become a different type of monster.

[[folder: Western Animation ]]
* In ''WesternAnimation/AlienatorsEvolutionContinues'', Wayne ended up spending the series mutating into a new form OncePerEpisode after accidentally eating one of the alien cells in the first episode.
* In an episode of ''WesternAnimation/ThePowerpuffGirls'', a boy transforms into a giant glue moster after eating radioactive glue.
* In the ''WesternAnimation/CourageTheCowardlyDog'' pilot "The Chicken From Outer Space", eating alien eggs causes Eustace to [[BodyHorror transform into a monstrous chicken man]].
* ''WesternAnimation/TheMagicSchoolBus'' showed a RealLife example with carrots. Arnold ate nothing but carrot-based snacks for days and turned orange.
* When Silkie, the WesternAnimation/TeenTitans' TeamPet was introduced, he ate some of Starfire's alien zorkaberries, which promptly turned him into an unstoppable (though still cuddly) behemoth.
* An episode of ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'' has Jimmy, Sheen and Carl venture into the Bahama Quadrangle and meet with a mysterious scientist named Dr. Moist. There, they find that he lures people there to feed them a mutagenic seaweed that turns them into seaweed monsters, and only a special antidote that he drinks with his weed can reverse the effects.
* In "[[HalloweenEpisode The Terrifying Tales of]] WesternAnimation/{{Recess}}" (during the segment "Children of the Cornchip"), Cornchip Girl eats from a bag of "Ye Olde Crisps", an untested brand of corn chips imported from a spooky English town, which cause her to turn into a [[OurWerewolvesAreDifferent werewolf-like]] "[[NotUsingTheZWord monster]]".

[[folder: Real Life ]]
* Some opposers of GMO food fear this is true whenever food includes "mutations" ([[YouFailBiologyForever or even "DNA"]]). Mutations happen spontaneously in all living organisms, allowing for such things as natural evolution. There could be a infinitisimally small chance that not all the vectors used for transgenic modification were integrated into the nuclei of the GMO, but the stomach produces enzymes that break down DNA.
* Eating too many carrots, or anything else with beta-carotene, can cause your body to dump the pigment into your skin cells rather than metabolise it into Vitamin A (which is seriously poisonous in excessive amounts), making you carrot-coloured. [[http://www.independent.co.uk/news/too-much-sunny-delight-turns-girls-skin-yellow-1134703.html Drinkers of Sunny Delight have also suffered this]].