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->''"Now, now, I'm sure it's nothing to worry about... although such a rapid weight loss in such a short space of time is most unusual."''
-->-- '''Doctor,''' ''WesternAnimation/{{Robotboy}},'' "Tummy Trouble"

In western animation and anime, you can have a character whose size can moderately or drastically change for just a few minutes as the scene calls it, or even for the whole episode. Characters may either [[ShapeshifterBaggage gain weight, lose weight]], [[GrowingMusclesSequence grow muscles]], or [[InflatingBodyGag be inflated with air or liquid]] according to the script. However, when the scene or episode ends, the affected character will usually be back at their regular size as if nothing ever happened.

While this can be [[TransformationCauses caused]] by [[AWizardDidIt magic]], superpowers or science, it can also be caused by something that can realistically change someone's size. Even if this is the case, though, it'll likely happen at an unrealistically quick pace. Seldom will a character experience health issues from either the change to or the reversion from the new size, and if this temporary size is bigger than their normal size, they'll never suffer from excess skin, even if they lose the weight in an instant.

When [[TheFatEpisode used over the course of an episode]], it may be an element of AWeightyAesop. Shorter-term instances may be used for [[FatComicRelief sight gags]] or [[YouAreFat fat jokes]].

Rarely used in live-action television and/or film since the actor often has to wear [[FatSuit heavy padding and special make-up]], which is expensive and makes them very uncomfortable.

Not to be confused with YourSizeMayVary, where stylistic change may make someone merely seem larger or smaller without necessarily changing bulk. Contrast SizeShifter, IncredibleShrinkingMan or AttackOfThe50FootWhatever. Compare BalloonBelly. The HeavyVoice is sometimes a side-effect of this trope.

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!!Examples with their own pages:
[[index]]
* [[TemporaryBulkChange/AnimeAndManga Anime & Manga]]
* [[TemporaryBulkChange/ComicBooks Comic Books]]
* [[TemporaryBulkChange/WesternAnimation Western Animation]]
[[/index]]

!!Other Examples:
[[foldercontrol]]

[[folder:Advertising]]
* The innuendo-tastic mascot of UK price comparison site Confused.com had her [[https://www.youtube.com/watch?v=JqjMX9esvU4 weight rise by "37%" (actually more like 100% minimum)]] by magic in comparison to car insurance bills, making her pull out an exercising bike from her pocket and slim down to her normal size in two seconds flat.
* [[https://www.youtube.com/watch?v=nVsL_G5kl9Y This]] advertisement for Malabar bubble gum features a woman who can inflate another woman's bottom by inflating her bubble gum, and so it temporarily inflates to very large proportions.
* A [[https://vimeo.com/48584069 Turkish ad for Cheetos]] features two boys being harassed and embarrassed by a bully at a swimming pool. When the bully gets up on the diving board, flexing and trying to impress everyone, [[BreakTheHaughty they get their payback]] by magically blowing him up to a perfectly spherical ball.
[[/folder]]

[[folder:Animation]]
* ''Animation/HappyHeroes'': In Season 2 episode 10, Big M. unleashes a flying saucer that causes people to gain ten pounds every time they say something honest, effectively forcing them to lie if they don't want to become so fat. The effects of the saucer, including the victims' gained weight, are reversed by the end of the episode.
* In ''Animation/PleasantGoatAndBigBigWolf: Joys of Seasons'' episode 57, Wolffy, after eating through a wall of cake that was set up by Paddi, becomes much fatter than usual. When he goes back to Wolf Castle, he exercises the weight off, and by the next scene he is back to normal.
* In ''Animation/RedShoesAndTheSevenDwarfs'', the title female character keeps her thin, perfect hourglass figure through the use of her red, magical shoes. Once she takes them off her waistline increases significantly.
[[/folder]]

[[folder:Comic Strips]]
* ''ComicStrip/{{Peanuts}}'': Snoopy's brother, Spike, went through this when he first came to visit. Lucy, who was taken aback by his scrawny physique, decides to fatten him up. He returns to the dessert where he slowly loses the weight he gained. By the time he visits Snoopy a second time, he's skinny again.
* Ever-shallow ComicStrip/{{Curtis}} briefly lost his crush on Michelle when she returned from France big enough to [[{{Pun}} crush]] him. The next time we saw her, she was as svelte as before the trip.
* There have been several ''ComicStrip/{{Garfield}}'' arcs where the titular fat cat binges on massive amounts of pet food and becomes enormously round--to the point where his paws can't touch the ground because his belly is propelling him upwards. These arcs usually last about a week, with Jon forcing Garfield to [[DietEpisode diet]] until he's back to his still-fat but mobile self. It might also be counted as EarlyInstallmentWeirdness, as later strips (along with the series ''WesternAnimation/GarfieldAndFriends'') have Garfield regularly eat enough food to feed twenty fully-grown humans and not change size at all.
[[/folder]]

[[folder:Fan Works]]
* Like [[WesternAnimation/FamilyGuy the show its based on]], see the Western Animation page for that, ''Website/FamilyGuyFanon'' does have an original instance of this trope in Season 4's "[[https://familyguyfanon.fandom.com/wiki/A_Star_is_Born..._Kind_Of A Star is Born... Kind Of]]". In the B-plot, Peter's father Francis becomes as obese as Peter after accidently falling into a vat of lard during a factory tour at the Quahog Lard Factory. Peter helps Francis feel better by showing him the joys in being overweight, which makes Francis realize that being fat's not all that bad and begins to bond over their shared love of food. However, the two eat so much and gain so much weight that [[HelpImStuck they get stuck in a booth at one of the restaurants they stop at and need to be hoisted out by a cranes]]. This, alongside the cranes breaking from their weight and getting injured, gets them to call it off and get some liposuction, restoring Francis to his original size and making Peter skinny again like he was in "He's Too Sexy For His Fat". Though Peter remarks [[LeaningOnTheFourthWall he'll be back to his usual size by next Sunday]].
* In ''Fanfic/ImaginarySeas'', the muscles of Percy's arms briefly bulge in size while he's using his Stout Arm of Brutality skill, allowing him to easily thrash Lostbelt Chiron with brute force.
[[/folder]]

[[folder:Films -- Live-Action]]
* In the ''Film/EpicMovie'', a parody of Mystique is present throughout most of the film, played by the thin, hourglass-figured Carmen Electra. However, during the sex scene between her and the main character Peter, she asks him what he'd like her to shapeshift into. His final request is [[ChubbyChaser big flabby grandma arms/bingo wings like a fat blue Britney Spears]] causing her to get incredibly fat and flabby, even changing into a much fatter actress. Could be a subversion as it's the last thing we see of Mystique in the film, [[FanDisservice as it fades to black soon after he pulls her down and they start to get in on while she's fat, meaning she never changes back to her normal size.]]
* In ''Film/TheSantaClause2'', Scott Calvin gets the idea to fly with Comet back to the North Pole to defeat the Toy Santa. Comet has gorged on chocolate to the point of being unable to fly... or move for that matter. Later that night, Comet is still too bloated to help deliver the presents on Christmas Eve, so Chet takes his place.
[[/folder]]

[[folder:Literature]]
* Happens to Sam, the protagonist of ''Literature/BirthdayBoy''. After wishing on a star to have his birthday celebrated everyday, and said wish coming true, Sam enjoys cakes, sweets, breakfast-in-bed and other extravagant food every day. Which results in him growing, by the book's own words, "very, very large". His behavior also changes as he becomes a spoiled, selfish, grumpy FatBastard. However, when his grandpa goes missing and nobody cares due to everyone obsessing over his birthday, Sam has a JerkassRealization and goes searching for him, resulting in him losing all the excess weight he gained due to his gluttony and laziness.
* In ''Literature/DrFranklinsIsland'' Arnie is [[ForcedTransformation turned into]] [[ScaledUp a big, powerful snake]] over the course of [[SlowTransformation at least a month]]. When he's turned back more rapidly his mass is conserved and he's enormously fat, but loses the weight quickly.
* In the ''Literature/FafhrdAndTheGrayMouser'' story ''Lean Times in Lankhmar'' the titular heroic duo part ways, and their new life causes them to know this trope in opposite ways. The svelt and slender Mouser gains a large belly due to a lazy life of riches, while the muscular Fafhrd becomes lean and skinny due to an ascetic religious lifestyle. By the next story, ''Their Mistress, The Sea'', they have to exercise a lot to return to their original body shapes - the Mouser to lose his extra-fat, Fafhrd to regain his original strength.
* ''Literature/MillyMolly'': In "Junior Joe", Junior Joe starts exercising, which temporarily causes him to lose weight, but for the rest of the series, he's still chubby, he's just now {{Acrofatic}}.
* The ''Miss Nelson/Viola Swamp'' books. How the heck did Miss Nelson drastically lose enough weight to play Miss Swamp and then go back to normal, again?
* In ''The She Hulk Diaries'', everyone wearing the clothes made by designer X (in reality the pranking villain nicknamed "Super Brat") instantly becomes obese. Fortunately She Hulk is there to help remove the clothes, which immediately reverts them to normal.
* In the ''Literature/FederationOfTheHub'' story "Trouble Tide", a symbiotic lifeform gives mammals the ability to survive in the deep sea. When they return to the surface, the extra structures it grows are converted to body fat. That works fine for the seal-like native lifeforms, but it leaves the story's human protagonists so dangerously obese that they need days of surgery and months of dieting to recover.
* ''Literature/RoysBedoys'': In “Roys Bedoys Loves Video Games”, when Roys starts playing his video game too much, he becomes fatter due to lack of activity. He’s back to normal size by the next story.
[[/folder]]

[[folder:Live-Action TV]]
* In the first 3 episodes of season 2 of ''Series/{{ThirtyRock}}'', Jenna, because of her eating 4 slices of pizza during all of her performances of Mystic Pizza: The Musical, Jenna has gained a pot belly that only lasts until episode 4.
* ''Series/BigWolfOnCampus'':
** One episode has Merton go from thin to ''morbidly'' obese in a matter of days after befriending a group of black-clad teenagers. It turns out they're actually SpiderPeople who are intentionally [[FatteningTheVictim fattening him up to eat]].
** The season one episode "The Wolf Is Out There" focused on Tommy noticeably gaining weight as a result of his appetite going out of control thanks to his wolf-side. While he doesn't balloon up to the same size as Merton, his weight's noticeable that people start making fun of him for it (specifically Tim and Travis, even though they're both much bigger than Tommy) and he splits his pants.
* In an episode of ''Series/GoodLuckCharlie'' Amy bloats up (making her look mordibly obese) after suffering an allergic reaction.
* In the puppet show, ''Series/BetweenTheLions'':
** The pigeons Walter and Clay got extremely fat after eating all of the popcorn in order to clean up the roof garden in The Popcorn Popper. Instead of flying, due to their heavy weight, they roll away instead. Luckily, they return back to normal by the next episode.
** In another episode, this time being The Good Seed, the pigeons eat an entire bag of seeds, only to get fat again. They, of course, return to normal by the next episode.
* In "The Rough Patch," an episode of ''Series/HowIMetYourMother'', Barney develops a small BalloonBelly due to being in a comfortable relationship with Robin; the characters call the weight gain "relationship gut." However, both he and Robin are actually miserable together, which manifests in different ways. Robin grows extremely stressed and becomes haggard and exhausted, while Barney can't stop eating and eventually becomes so huge that he needs to sit down and rest while walking to a table in the gang's favorite pub. Interestingly, Ted admits to being an UnreliableNarrator in this case--he explains that Robin and Barney didn't ''really'' change that drastically, but from his perspective, they became totally different people. When Barney and Robin break up at the end of the episode, they instantly revert to their previous selves.
* In the ''Series/MarriedWithChildren'' episode "Live Nude Peggy", Kelly was trying to gain weight for a weight loss commercial, but the weight all went to her butt, and she didn't get the role in the commercial. She did lose the weight before the next episode.
* At the end of the ''Series/PhilOfTheFuture'' episode "Unification Day", the whole Diffy Family was eating meatloaf for the last 3 months, because Pim tried using spray meatloaf to cheat in cooking class, and the only one who gained weight was the father, Lloyd, but he gained it all in his behind. Before the next episode, and the rest of the series, he lost that extra weight.
* ''Series/ThatsSoRaven'' has "Food for Thought," an episode which points out that [[AWeightyAesop too much junk food leads to terrible health.]] Raven's high school cafeteria is bought out by a fast food corporation which slowly introduces more and more insane amounts of unbelievably fatty foods until even the halls are full of freebie hot snack machines to keep them hooked. Obviously, almost every student is said to be getting noticeably fatter, even though no actual change is visible. However, Raven does have a vision of a BigFatFuture in which everyone in the school grows a gigantic behind because of the unhealthy cooking.
* In ''Series/ZyudenSentaiKyoryuger'', Ramirez is a BigFun type of guy, during his transformation into Kyoryu Cyan his belly shrinks to a more normal size, resembling an inverse BalloonBelly (complete with a WackySoundEffect).
* During Lois's fifth pregnancy in ''Series/MalcolmInTheMiddle'', Hal starts {{Gaslighting}} her by tricking her into eating high-calorie food despite her doctor's orders specifically because he's trying to [[ChubbyChaser keep her]] [[BigBeautifulWoman big and sexy]]. He gets caught by the end and Lois eventually loses her pregnancy weight when Jamie's born.
* In the ''Series/{{Wings}}'' episode "When A Man Loves a Donut", Brian has put on a large amount of weight from over eating, but loses the weight completely in the next episode.
* In the ''Series/DesperateHousewives'' episode "If...", Susan's relationship with her her husband, Karl, is straining, so she drowns her sorrows in baked goods, putting on weight in the next scene, but loses the weight in the next scene 6-7 minutes later.
[[/folder]]

[[folder:Tabletop Games]]
* The ''enlarge person'' and ''reduce person'' spells from ''TabletopGame/DungeonsAndDragons'' and ''TabletopGame/{{Pathfinder}}''.
[[/folder]]

[[folder:Toys]]
* ''Toys/{{Bionicle}}'':
** When Brutaka is infused with gaseous [[FantasticDrug antidermis]], it causes his muscles to grow, but the effect wears off after a short while. Later on, he absorbed liquid antidermis, and the effect became permanent.
** In the Karda Nui arc, the light-energy emanating from the area boosted Takanuva's natural light-powers, causing him to grow considerably larger than his fellow heroes (to a $30 price-point titan-sized set, as opposed to the regular $13 canister sets). When he left Karda Nui, he shrunk back to his original size.
[[/folder]]

[[folder:Video Games]]
* Similar to Roshi (as he's a {{Expy}} of him), Tung Fu Rue in ''VideoGame/FatalFury'' hulks out after losing a fourth of his health and becomes radically larger and more muscular. After getting knocked to one-fourth of his health, he shrinks back to normal. In later games, the trope is discarded, and Tung Fu Rue's "muscle" self is actually his BattleAura.
* Queen Oren in ''VideoGame/TheLegendOfZeldaALinkBetweenWorlds'' goes from a svelte fish woman to a giant BrawnHilda when the Shady Guy steals the Smooth Stone from her fountain. At one point, she is shown immediately getting bigger upon gulping down a fish, and the other Zoras maintain that Link must get the stone back before she gets even bigger.
* Whenever Wario (already a FatBastard to begin with) eats the cake thrown by the Cook enemy in ''VideoGame/WarioLandII'' (or also the apples in ''[[VideoGame/WarioLand3 3]]'' and ''[[VideoGame/WarioLand4 4]]''), he turns into Fat Wario and is able to KO enemies by walking into them, break through certain blocks by jumping on them, and weigh down floating platforms.
* In the ''VideoGame/MetalSlug'' series, getting too many food items in a row will fatten your character (with an appropriate "Uh-oh, big!" from the announcer), slowing them down, but making their shots more powerful (because the ''guns and bullets'' somehow get fatter as well). They will lose the bulk after a while, but there are two ways of slimming back down faster: by getting the "diet" item, or dying.
* ''VideoGame/FatPrincess'': 'Rotund' may be how the titular princess(es) are depicted, but unless you keep that cake coming they'll slim down very quickly, making it all the easier for the opposing team to carry her off.
* In ''VideoGame/StreetFighterV'', [[VideoGame/StreetFighterIV Seth]] can temporarily bulk themselves up when doing a move they've copied from certain opponents (Zangief, Abigail, Birdie and Balrog all come to mind) via their first V-Skill, presumably out of animation consistency.
* ''VideoGame/{{ARMS}}'' has two characters who can do this: [[WorldsStrongestMan Max Brass]], who can [[GrowingMusclesSequence bulk up his muscles]] via charging up his ARMS to give himself armour for tanking weak attacks, and [[NonIronicClown Lola Pop]], who can [[InflatingBodyGag inflate her whole body]] to block and parry attacks.
* ''VideoGame/MarioAndLuigiBowsersInsideStory'':
** The plot is kickstarted by Toads contracting the Blorbs; an ailment that causes them to swell up into a large spherical shape.
** Bowser is fed a ton of high-calorie food until he gains so much weight he gets stuck in the floor.
** Peforming the Snack Basket Bros. Attack has Luigi chow down on a series of desserts, bloat to a massive size, and slam into the ground, creating a shockwave.
* In ''VideoGame/YumeNikki'', one of the Effects that can be found is the "Fat" effect, [[ExactlyWhatItSaysOnTheTin which causes Madotsuki to gain weight]]. Selecting it again in the effects menu will turn it off, turning her back to normal.
[[/folder]]

[[folder:Web Animation]]
* Happens frequently on ''WebAnimation/MightyMagiswords'' courtesy of the Muscly Arm Magisword, one of the most common Magiswords used on the show. When used, one or both arms of either the holder or the target becomes extremely muscular [[ExactlyWhatItSaysOnTheTin as the name implies]]. The rest of the body, however, doesn't usually gain any muscle. However, as shown in the episode "Warts and All", accidentally throwing in the Muscly Arm Magisword into a volatile potion will make anyone caught in the blast radius very muscular all over, not just in the arms. Prohyas and Witchy Simone got back to normal seconds later, the fly that the [[BewitchedAmphibians temporarily frogified]] Vambre was going to have for a snack, not so much.
* Nora in ''WebAnimation/RWBYChibi'' at one point gains a BalloonBelly mere seconds after [[BigEater swallowing an entire cake whole]], and returns to normal in less than a second after a single [[GassHole belch]]. (An observing Yang, meanwhile, has just finished a rigorous TrainingMontage to [[WeightWoe lose weight]], and is less than amused.) In a later skit, she balloons a second time from eating an entire stack of pancakes (''and'' the Geist Grimm possessing them), again in one bite, and asks for one more afterwards.
[[/folder]]

[[folder:Web Comics]]
* ''Webcomic/ElGoonishShive'':
** Nanase and Ellen [[http://egscomics.com/egsnp/2009-12-01 play]] VideoGame/FableII and Nanase uses the XP she's earned to become more powerful which results in becoming taller and bulkier. She also consumes pies to keep her HP up which results in becoming [[{{Acrofatic}} fatter]]. She then assures Ellen that celery will [[HyperactiveMetabolism fix that]] and, according to Dan in TheRant, she's right.
** Susan similarly grows fatter in a similar game, "Parable", after testing out a potion [[https://www.egscomics.com/egsnp/parable-026]] given to her by [[PunnyName Dea Elsee]] the alchemist, after removing her cool Victorian-type suit beforehand.
* In ''Webcomic/TheFoxSister'', the dog Soot Bull gorges himself on Alex's gift of leftover bulgogi, and for the rest of the day is [[http://thefoxsister.com/index.php?id=29 much tubbier than usual.]] Yun Hee even comments on it.
* ''Webcomic/ThePetriDish'':
** When Thaddeus and (possibly) Bob get superpowers, they grow muscles. When the powers go, so do the muscles.
** Downplayed in one strip where Thaddeus gets a slight belly and it takes a few strips for him to lose it.
* One story arc in ''Webcomic/SequentialArt'' had Art being temporarily fattened up thanks to a prank pulled by Scarlet and her sisters. After struggling to lose weight for several strips, he's returned to normal size after [[spoiler:alien robots who want to eliminate him because he's WalkingTechbane shoot him with a disintegrator ray, but only manage to burn off the excess bulk.]]
* This is a power ([[BlessedWithSuck well more of a curse]]) of Aisha from ''Webcomic/SlimyThief''. When she touches water she absorbs it and gets fatter but losing the water slims her down.
* ''Webcomic/{{Serix}}'': Since Rees's heavyset appearance comes from overeating rather than being the way her synthetic bodies are designed, she is visibly thinner after being killed in battle and transferred to a backup. She regains the weight by the time the next chapter starts.
* In ''Webcomic/StarImpact'', [[GirlyBruiser Lily]]'s [[EveryoneHasASpecialMove special glove power]] is to temporarily buff up whatever part of her body that she wants. This is shown to have [[SwissArmySuperpower more applications]] beyond a mere [[TheRightHandOfDoom Right Hand of Doom]] EnhancedPunch, however, as she can also use it to buff up her leg muscles to dart in and out of her opponent's range and perform withering hit-and-runs, and can also buff up her abdomen to better soak up body blows. Even without using it, [[LightningBruiser she can be zippy and nimble while still being able to hit like a truck at any moment]], and [[MentorArchetype Stryker]] points out that, on paper, she has no real weaknesses.
* The fox in ''[[Webcomic/TallyHo Tally Ho!]]'' learned too late not to eat the gravy meant for Sigfried. He became an immobile furry ball, but it lasted only two strips. Not to say he was fortunate, because [[NauseaFuel the end of his digestion felt horribly thorough]].
* [[TheBigGuy Rak Wraithraiser]] from ''Webcomic/TowerOfGod'' once got shrunk to half a man's height (he was initially 4 m tall) because he accidentally bumped into Yu Hansung and didn't apologize, instead he made comments about how small and unnoticeable he was. So Yu Hansung kept bumping into the chibified Rak over and over, saying how he was so small he didn't notice him. Justified in that Compression is an often used supernatural technique in this series.
[[/folder]]
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