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* ''Literature/TheBookOfDragons'': In "Literature/WeDontTalkAboutTheDragon", the dragon is constantly wracked with burning, all-consuming hunger strong enough to be projected onto anyone in its vicinity. In the end, this is revealed to be because [[spoiler:[[MetalMuncher it needs to feed on gold]], which even in small amounts can sate it entirely; the iron it was being fed on was enough to keep it alive, but wasn't enough to actually meet its dietary needs]].
* ''Literature/Catseye1961'': Kyger claims that the Terran animals can not survive without the special food he provides, explaining to a patrolman why stealing one would be folly. Later, Troy sees them hunting and eating freely in the wild, revealing that this was a lie.

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* ''Literature/TheBookOfDragons'': In "Literature/WeDontTalkAboutTheDragon", " We Don't Talk About the Dragon", the dragon is constantly wracked with burning, all-consuming hunger strong enough to be projected onto anyone in its vicinity. In the end, this is revealed to be because [[spoiler:[[MetalMuncher it needs to feed on gold]], which even in small amounts can sate it entirely; the iron it was being fed on was enough to keep it alive, but wasn't enough to actually meet its dietary needs]].
* ''Literature/Catseye1961'': ''Literature/CatsEye1961'': Kyger claims that the Terran animals can not survive without the special food he provides, explaining to a patrolman why stealing one would be folly. Later, Troy sees them hunting and eating freely in the wild, revealing that this was a lie.



* ''Literature/TheGodwhale'': The genetically modified super-soldier was deliberately made unable to synthesize six of the seventeen amino acids necessary for him to stay alive. This means that he is dependent on the government/ruling class to provide him with a specially-compounded bread or he will die.
* ''Literature/JurassicPark'':

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* ''Literature/TheGodwhale'': The genetically modified super-soldier SuperSoldier was deliberately made unable to synthesize six of the seventeen amino acids necessary for him to stay alive. This means that he is dependent on the government/ruling class to provide him with a specially-compounded bread or he will die.
* ''Literature/JurassicPark'':''Literature/JurassicPark1990'':



* ''Franchise/StarTrek'':
** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] ''[[Literature/DoctorsOrders Doctor's Orders]]'' Dr. [=McCoy=] reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.
** ''Series/StarTrekTheNextGeneration'': In "Debtor's Planet" Riker forgets that there's a whole list of Klingon foods that humans simply cannot consume because they are toxic to humans. He winds up needing to take a trip to sick bay after consuming the first dish on that list.

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* ''Franchise/StarTrek'':
''Franchise/StarTrekExpandedUniverse'':
** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] ''[[Literature/DoctorsOrders Doctor's Orders]]'' ''Literature/DoctorsOrders'', Dr. [=McCoy=] reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its it's a necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.
** ''Series/StarTrekTheNextGeneration'': In "Debtor's Planet" the ''Series/StarTrekTheNextGeneration'' novel ''Debtor's Planet'', Riker forgets that there's a whole list of Klingon foods that humans simply cannot consume because they are toxic to humans. He winds up needing to take a trip to sick bay after consuming the first dish on that list.



* ''Franchise/MassEffect''

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* ''Franchise/MassEffect''''Franchise/MassEffect'':
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* ''Fanfic/ASongOfSilkAndSaplings'':
** Hornet, being part spider, is an obligate carnivore and liquivore. She cannot digest plant-based food at all, and can only digest animal-derived matter if it has been liquefied and partly pre-digested. Normally, she eats by simply hunting of her own accord in the way that spiders do -- that is, webbing up her prey, injecting it with digestive enzymes, and then drinking up the remains -- but in Bugaria, where carnivorous bugs are feared and hated, this causes her problems.
** Carnus the carrion beetle has a similar issue. He's a scavenger, which means that he can only digest decomposing meat. Unlike Hornet, who can at least hunt for herself, he's often reduced to robbing graves in order to eat the corpses.
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* ''TabletopGame/Warhammer40000'': According to the first edition sourcebook ''Waaargh! Orks'', the advanced intelligence of the ancient Orkoids was due to eating a very specific kind of fungus that stimulated brain growth. They were themselves unaware of this and, when they allowed the fungus to die out, they promptly regressed into their modern, primitive selves.
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* ''Fanfic/TheDragonKingsTemple'': Asyuntians and Go'auld have naquadah in their biochemistry, and as such require naquadah in their diets much as humans require iron or sodium.
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* ''Film/JurassicPark'': The dinosaurs are deliberately given a genetic mutation that prevents them from producing lysine in order to keep them from spreading outside of [=InGen's=] control. Without lysine supplements provided by scientists on the island, they would all die off. At least, that's the plan -- in practice, herbivorous dinosaurs adapted to feed on lysine-rich plants, while the predators get their lysine from their prey. Notably, in real life, no animals can actually produce lysine fast enough to meet metabolic demands, and all rely on their diet to supply themselves with it.

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* ''Film/JurassicPark'': ''Film/JurassicPark1993'': The dinosaurs are deliberately given a genetic mutation that prevents them from producing lysine in order to keep them from spreading outside of [=InGen's=] control. Without lysine supplements provided by scientists on the island, they would all die off. At least, that's the plan -- in practice, herbivorous dinosaurs adapted to feed on lysine-rich plants, while the predators get their lysine from their prey. Notably, in real life, no animals can actually produce lysine fast enough to meet metabolic demands, and all rely on their diet to supply themselves with it.



** Inverted with [[Characters/TheOwlHouseLuzNoceda Luz Noceda]]. As a human she's unable to digest most of the food on the Boiling Isles and the food she can eat is implied to be rather pricey. This becomes a problem at the beginning of the second season after [[spoiler:she destroyed the Earth portal at the end of the previous season to keep it out of [[BigBad Emperor Belos's]] hands, since the portal was previously used by Eda to collect either Earth food for Luz or human junk which she sold for money]].
** Played straight with [[Characters/TheOwlHouseTheHexsquad the Hexsquad]] after they are [[spoiler: stranded on Earth for a few months]] during ''Thanks to Them''. Like Luz in the Boiling Isles, they are unable to eat most of the local dishes, forcing [[spoiler: Camila]] to make lists in an attempt to narrow down the Hexsquad's palates.

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** Inverted with [[Characters/TheOwlHouseLuzNoceda Luz Noceda]]. Noceda. As a human human, she's unable to digest most of the food on the Boiling Isles and the food she can eat is implied to be rather pricey. This becomes a problem at the beginning of the second season after [[spoiler:she destroyed the Earth portal at the end of the previous season to keep it out of [[BigBad Emperor Belos's]] hands, since the portal was previously used by Eda to collect either Earth food for Luz or human junk which she sold for money]].
** Played straight with [[Characters/TheOwlHouseTheHexsquad the Hexsquad]] Hexsquad after they are [[spoiler: stranded [[spoiler:stranded on Earth for a few months]] during ''Thanks "[[Recap/TheOwlHouseS3E1ThanksToThem Thanks to Them''. Them]]". Like Luz in the Boiling Isles, they are unable to eat most of the local dishes, forcing [[spoiler: Camila]] [[spoiler:Camila]] to make lists in an attempt to narrow down the Hexsquad's palates.
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* LifeDrinker: A character who stays alive indefinitely by consuming some vital force from their victims.
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** The dinosaurs were crated to be dependent on artificial intake of lysine supplements to keep them from breeding outside of [=InGen's=] control.

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** The dinosaurs were crated created to be dependent on artificial intake of lysine supplements to keep them from breeding outside of [=InGen's=] control.
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** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] ''[[Literature/DoctorsOrders Doctor's Orders]]'' Dr. McCoy reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.

to:

** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] ''[[Literature/DoctorsOrders Doctor's Orders]]'' Dr. McCoy [=McCoy=] reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.
Is there an issue? Send a MessageReason:
None


** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] "[[Literature/DoctorsOrders Doctor's Orders]] Dr. McCoy reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.

to:

** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] "[[Literature/DoctorsOrders ''[[Literature/DoctorsOrders Doctor's Orders]] Orders]]'' Dr. McCoy reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.



** ''Series/StarTrekTheNextGeneration'': In "[[Recap/StarTrekTheNextGenerationS3E18Allegiance Allegiance ]]" the aliens holding Picard and two other aliens captive provide discs for their captives to eat, but the Chalna Esoqq cannot consume them as they are poisonous to him. This does nothing to improve Esoqq's mood, and he quickly comes to the point of being more violent [[PlanetOfHats than usual]] for members of his race.

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** ''Series/StarTrekTheNextGeneration'': In "[[Recap/StarTrekTheNextGenerationS3E18Allegiance Allegiance ]]" Allegiance]]" the aliens holding Picard and two other aliens captive provide discs for their captives to eat, but the Chalna Esoqq cannot consume them as they are poisonous to him. This does nothing to improve Esoqq's mood, and he quickly comes to the point of being more violent [[PlanetOfHats than usual]] for members of his race.

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* ''WesternAnimation/TheOwlHouse'': Inverted with [[Characters/TheOwlHouseLuzNoceda Luz Noceda]]. As a human she's unable to digest most of the food on the Boiling Isles and the food she can eat is implied to be rather pricey. This becomes a problem at the beginning of the second season after [[spoiler:she destroyed the Earth portal at the end of the previous season to keep it out of [[BigBad Emperor Belos's]] hands, since the portal was previously used by Eda to collect either Earth food for Luz or human junk which she sold for money]].

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* ''WesternAnimation/TheOwlHouse'': ''WesternAnimation/TheOwlHouse'':
**
Inverted with [[Characters/TheOwlHouseLuzNoceda Luz Noceda]]. As a human she's unable to digest most of the food on the Boiling Isles and the food she can eat is implied to be rather pricey. This becomes a problem at the beginning of the second season after [[spoiler:she destroyed the Earth portal at the end of the previous season to keep it out of [[BigBad Emperor Belos's]] hands, since the portal was previously used by Eda to collect either Earth food for Luz or human junk which she sold for money]].money]].
** Played straight with [[Characters/TheOwlHouseTheHexsquad the Hexsquad]] after they are [[spoiler: stranded on Earth for a few months]] during ''Thanks to Them''. Like Luz in the Boiling Isles, they are unable to eat most of the local dishes, forcing [[spoiler: Camila]] to make lists in an attempt to narrow down the Hexsquad's palates.
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Crosswicking.

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* ''Literature/TheGiraffeAndThePellyAndMe'': The Giraffe belongs to a fictional subspecies known as the Geraneous Giraffe, which feeds exclusively upon the flowers of the tinkle-tinkle tree. It is noted that while the Monkey and Pelican can go without their preferred foods of walnuts and salmon, the Giraffe is doing poorly because the trio hasn't found any tinkle-tinkle trees since they arrived in England.
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Spelling


** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] "[[Literature/DoctorsOrders Doctor's Orders]] Dr. McCoy reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a nessecary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.

to:

** ''Series/StarTrekTheOriginalSeries'': In the [[Franchise/StarTrekExpandedUniverse novel]] "[[Literature/DoctorsOrders Doctor's Orders]] Dr. McCoy reveals to Captain Kirk that not only is arsenic ''not'' a deadly poison for Klingons, but that its a nessecary necessary part of the Klingon diet and Klingons have health problems if they don't consume enough arsenic.
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* ''Film/StarWars'': Mynocks feed directly on energy. In their natural environment, they subsist mainly on stellar energy emissions, but they will happily siphon off power from spaceship power circuits as well.

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* ''Film/StarWars'': ''Franchise/StarWars'': Mynocks feed directly on energy. In their natural environment, they subsist mainly on stellar energy emissions, but they will happily siphon off power from spaceship power circuits as well.
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The Greek Gods are immortal by default. Ambrosia induce immortality in mortals because they came directly from the gods, and even then it only needed to be eaten once. The idea that it's the source of the gods' youth came from modern writers.


* Myth/ClassicalMythology: The gods eat ambrosia and drink nectar to stay immortal and turn their blood into ichor.

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* Myth/ClassicalMythology: Myth/NorseMythology: The gods need to eat ambrosia and drink nectar mystical apples from the goddess Idun to stay immortal and turn retain their blood into ichor.eternal youth.
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* ''Literature/KnownSpace'': The tree-of-life's microscopic symbiotes need soils rich in thallium oxide, a mineral common in the galactic core and rare everywhere else, to live. In turn, protectors need to consume tree-of-life root as their primary food source, and will starve without it.
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* ''Literature/{{Strata}}'': The Shandi have to eat a protein only found in other Shandi. If they don't they [[BerserkButton fly into a feeding rage]]. Fortunately they can synthesise the protein with a [[PhlebotinumBreakdown Dumb Waiter]], good thing it couldn't possibly [[PlotDrivenBreakdown break down]]...
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** ''Series/StarTrekTheNextGeneration'': In "[[Recap/StarTrekTheNextGenerationS3E18Allegiance Allegiance ]]" the aliens holding Picard and two other aliens captive provide discs for their captives to eat, but the Chalna Esoqq cannot consume them as they are poisonious to him. This does nothing to improve Esoqq's mood, and he quickly comes to the point of being more violent [[PlanetOfHats than usual]] for members of his race.

to:

** ''Series/StarTrekTheNextGeneration'': In "[[Recap/StarTrekTheNextGenerationS3E18Allegiance Allegiance ]]" the aliens holding Picard and two other aliens captive provide discs for their captives to eat, but the Chalna Esoqq cannot consume them as they are poisonious poisonous to him. This does nothing to improve Esoqq's mood, and he quickly comes to the point of being more violent [[PlanetOfHats than usual]] for members of his race.

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* ''LightNovel/ACertainMagicalIndex'': The ArtificialHumans known as Chemicaloids need their lollipops, because [[spoiler:they neutralize toxins and were engineered that way]].


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* ''Literature/ACertainMagicalIndex'': The {{Artificial Human}}s known as Chemicaloids need their lollipops, because [[spoiler:they neutralize toxins and were engineered that way]].

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