Sometimes, people just can't be fussy when it comes to getting what they need. Everyone Has Standards, but some standards just aren't worth suffering for. That goes double when said standards are about things like food and clothing - when it comes down to survival or being choose-y, most people would choose survival.
As such, there comes times when a character would do anything to satisfy a physical or emotional need. Hungry characters will be willing to Eat Dirt, Cheap if it means they can get something in their stomach. A person desperate for a friend will be willing to win over the first person they see on the street, personality and common interests tossed out the window. Someone who needs medical attention will be more likely to trust the Snake Oil Salesman with a supposed "universal cure" than someone in better shape.
In general, this trope happens when a character is in serious need for something related to their own well-being, or occasionally someone else's, to the point that they'd willingly do something that would otherwise be highly unpleasant, or even risky. When the choice is something moral, you have I Did What I Had to Do. The trope is most often used when a character is desperate for food or water, but it's not the only scenario.
In certain situations, this trope might overlap with a few others, including: Closest Thing We Got, in cases where, for example, a wounded character has to get help from a dentist because it's all they have; O.O.C. Is Serious Business, if a character violates their own set standards in an act of desperation; No Party Like a Donner Party, if they're resorting to cannibalism to stave off starvation; and One-Track-Minded Hunger.
Compare Too Hungry to Be Polite, Moment of Weakness, and Ain't Too Proud to Beg. Might result from Would Rather Suffer Anything but That!, or Exhaustion-Induced Idiocy, and may occur to people living After the End. Supertrope of Dog Food Diet and Reduced to Ratburgers. When not even the fact that they are desperately needy will make someone accept a certain kind of donation, see this trope's inversion: Even Beggars Won't Choose It.
- In Karma in Retrograde, Touya Todoroki isn't picky about what he wears or eats. He buys and wears casual clothes that make him a Rummage Sale Reject were cheap and comfortable because his Quirk would destroy them rather quickly. He prefers quantity over quality when it comes to food because his Quirk is constantly burning through his energy reserves, forcing him to keep eating to avoid starving. He also has no issues with getting things from a Dumpster Dive because of how thrifty he is, shocking his younger brother Shouto.
- In Amazing Fantasy, Peter is dropped into Izuku's universe with nothing but the clothes on his back and his web-shooters. He has nothing to subsist off of other than a portion of Izuku's allowance, forcing him to get creative to carve out a living. He hacks into a local radio tower for cellular service, lives out of an abandoned amusement park, and tells Izuku to mix up web fluid in class since neither of them have the cash or equipment to make it otherwise.
- From Bajor to the Black: Lieutenant (JG) Kanril Eleya is stuck putting together an acting flight crew for her light cruiser Kagoshima after most of the senior officers are killed or incapacitated during a Borg surprise attack. She ends up with a torpedo officer from another ship handling weapons, one of the lower-level engineering officers as chief engineer, and an ensign who likes to play holodeck sims of Operation Return at the helm.
Eleya: (facepalm) Fine, we don't have time to be picky. Ahead full.
- A less urgent but slightly comical example of this occurs in the Star Trek: Deep Space Nine fic "Understanding Unknowns"; after Kira and Odo have a child, they select Vic Fontaine as the godfather on the grounds that he's the only person in their close social circle who doesn't regularly receive death threats, while they cite the example set by the Doctor (Star Trek: Voyager) as proof that a hologram can be a godfather.
- Early in My Abominable Monster Classmates Can't Be This Cute!, Jaune eats Zwei's dog food as he hasn't eaten in a few days and currently has no way to get any food that's safe to eat (Grimm hybrids eat raw meat).
- Help Wanted: After a group known as the Tolsarans offer help against Thanos in exchange for deciding what to do with the Infinity Stones afterwards, Steve questions whether it's a good idea to trust a group they know nothing about with the Infinity Stones. Nick Fury tells him and the other Avengers point blank that Earth has literally no hope of winning without the Tolsarans and they are to do whatever the aliens ask of them without question.
Fury: Let's make this clear, all of you. We need this. Were all going to die if these people dont help us. So yes, we're going to trust them. Were going to do whatever we need to to get them to help us. I expect all of you to kiss their asses as much as necessary. I don't give a damn if Thor walks out of that ship buck naked and asks you to tap dance for him, you will do it. If he wants you to sit on the front of his ship like a hood ornament through the invasion, you will do it. If the Queen says she wants you to marry her, you will damn well do it, because that's what the world needs from you, you understand? This is not the time to start doubting. You will wipe that uncertainty off your face and you will bow down if they want, you will be polite and respectful, you will address the Tolsarans however the hell they want to be addressed, and you will do anything they ask of you. Are we clear?
- The Force Awakens:
- After crash-landing on a desert planet and making the trek to a remote outpost, Finn is thirsty enough to choke down water from an animal trough, gagging all the while. The trough is even being used by some hideous, runny-nosed pack creature at the time.
- When Finn and Rey have to escape Jakku, they first run to a perfectly good ship... which gets destroyed seconds later. They're forced to go with the "junk" ship nearby, that "hasn't flown in years," just to escape their enemies. Luckily for them, it turns out to be the Millennium Falcon.
- Venom (2018): When he's newly infected by the Venom symbiote and doesn't know how to manage its appetite, Eddie gets so desperate for food that he eats raw chicken scraps out of the garbage and live lobsters out of a tank in the middle of a restaurant.
- A Knight's Tale: After his breastplate is cracked in a joust during his first tournament, William goes to several smiths hoping to find one who'll fix it on credit. With no money, and no guarantee that he'll win any, he's directed to the (female) farrier, who, admittedly, turns out to be a pretty darn good smith after William picks at her professional pride to get her to help him.
Male smith: Beggars cannot be choosers, milord.
- SHAZAM! (2019): Billy Batson becomes the inheritor of the wizard Shazam's powers not because he was proven worthy, but because Shazam is about five minutes away from dying and Dr. Sivana had just gotten the power of the Seven Deadly Sins, so he needs a new holder that his spell deems potentially worthy right away, regardless of whether Billy is truly fit for the position.
- Jungle: Yossi is lost in the jungle and starving and willing to eat anything he can get his hands on in order to survive. Best demonstrated when he cracks open two eggs he found and eats the unhatched baby birds he finds inside. He forces them down, bones and all. He is visibly disgusted by his actions, but does it anyway.
- In The Rising of the Shield Hero, Naofumi initially buys the sickly and weak Raphtalia because he needs a way to damage enemies to grow stronger and she's all he can afford.
- I Was A Sword When I Reincarnated: This is how Fran and Teacher met. Fran was forced by slavery magic to fight a two-headed bear, and needed a weapon, any weapon, damn the consequences, or she'd die and he's just happy that someone pulled him out of the ground after being stuck in it for a month.
- Played straight and discussed in The Most Beautiful Moment In Life: The Notes. Namjoon's family settled with living in any place as long as it 1. had a hospital for his ill father, and 2. gave a job to Namjoon (who, being a minor, had to drop out of high school to work). Namjoon himself and an unnamed coworker were the most desperate employees in an already highly competitive environment (a delivery service in a small village), going for the most difficult and dangerous jobs under minimal-to-nonexistent security measures to earn just a little more money, which ends up leading to the coworker's death, to which the town reacts with little more than apathy. Namjoon hates that poverty reduces people to this, making them give up things that should be precious.
- Warrior Cats:
- During Brokenstar's time as leader of ShadowClan, his warriors spent all their energy battling rather than hunting, so cats resorted to eating the rotting crowfood left in the Carrionplace.
- Clan cats prefer freshly-killed prey and find pet food disgusting and degrading to eat, but there are times when some of them are on journeys and don't have time to hunt, or else are being held captive by Twolegs, so they end up eating it anyway to keep their strength up.
- Similar to the pet food example, Clan cats will only shelter in abandoned buildings when absolutely necessary, such as in the second book when a storm kicks up as WindClan travel home.
- Life of Pi: Pi describes this happening to him as he tries to survive adrift at sea. Though a pacifist and vegetarian, he soon is slaughtering fish and turtles for food, and getting moisture by drinking the animals' blood or sucking out their eyeballs. He notes that in a true life-and-death situation, humans find themselves capable of doing just about anything to survive. In both versions of the story he tells, he eventually resorts to cannibalism out of extreme need.
- BlazBlue: This very trope leads to Litchi making one of her hardest decisions in the game's story. His friend, Arakune, was mutated from the effects of the Boundary and becomes an Eldritch Abomination, and as a doctor, she tried everything she can to find a way to cure him, including giving herself some Boundary corruption in order to understand his condition more. But that gets her mind slowly being deteriorated, with the risk of becoming just like her friend; she tried finding help from her old colleague Kokonoe, but the latter refuses, saying that Arakune's condition is basically irreversible and Litchi shouldn't corrupt herself in the first place. This gets Hazama's attention, who tempts her with a potential cure within the NOL's technology, in exchange of joining his side. As she's out of options, she reluctantly takes his offer, even with her knowing that Hazama is hardly trustworthy. This makes her part of the antagonist side, which continues to the third game; she does, at least, seem to be better off condition-wise, but Arakune's problems remain even then.
- Some of the Pokémon Munchlax's Pokedex entries mention that because it's so desperate to consume its entire weight in food every day, it is completely indifferent to flavor.
- StarCraft II: Wings of Liberty: The Protoss arrive to sterilize a colony of Zerg virus-infested humans, but are willing to let Raynor purge them himself (opposed by Dr. Hanson, who's desperately looking for a cure). Going with the Protoss results in Hanson sealing herself in the lab and injecting herself with the Zerg virus to try and find the cure, transforming herself into a Half-Human Hybrid before getting put down by Raynor. The canon choice is fighting the Protoss (in which case the infestation is limited to a few people, rather than several settlements in the non-canon branch).
- Wolfenstein 3D: Eating food restores your health. The character's not too proud to eat dog food to get health back. If you're under 10% health, you can even drink a pool of blood to get 1% of your health back. There's a particularly gruesome slurping sound effect when this happens.
- Alantutorial: During his time lost in the wilderness, Alan posts videos of himself eating from dumpster bags and getting his water from eating snow; of course, they're framed as tutorials teaching his audience how to survive being homeless in the woods. Later, Alan becomes desperate for the money given to him by his captors and willingly gives up his own free-will to make tutorials for them in return, even though he was initially insistent on defying them.
- The Human Pet: Eric gets so hungry and thirsty while he's trapped that he scarfs down cat food and drinks bleached pond-water, despite the humiliation and risk. It's especially dangerous because the "menu" was chosen by the viewers; if he was given the wrong thing, it'd kill him anyway.
- Game Grumps: In the "10 Minute Power-Hour" episode "Making TIE DYE!", Ryan gets sent out to find tie dye materials. He ends up wandering for a while, becoming confused, hungry and thirsty. He digs out of trash-cans, spends some time looking for extremely cheap food including a mention of a homeless shelter, and manages to end up lost in the desert, where he resorts to drinking from a waterfall and eating leaves off of a tree.
- Jacksfilms: The joke of "All I Want for Christmas is a Girlfriend" is that Jack is so desperate, he'll take literally any girl, so long as she's single.
- Ed, Edd n Eddy's Big Picture Show: When he believes that Ed and Eddy have sunk into quicksand, Edd resorts to clawing through the muck to save them.
- The Fairly OddParents: Invoked in "Just the Two of Us!" When Timmy continuously gets passed over by Trixie, he ends up wishing he was the only other person besides her and his fairies on the entire planet. After avoiding him the rest of the episode, she's forced to spend time with him, but the sudden isolation has seriously taken its toll on her sanity, forcing Timmy to revert his wish.