Appeal to Nature

"They used to advertise, 'If you've eaten a banana and drank some milk, you've had everything in N*Sweet.'"
"My reply was, 'You've also had everything in potassium cyanide. So what?'"
— Joe Zeff, ASR quotes

The Appeal To Nature, also called the Naturalistic Fallacy, involves assuming something is good or correct on the basis that it happens in nature, is bad because it does not, or that something is good because it "comes naturally" in some way. This is fallacious because it turns "natural" into an ideal state without any meaningful reason, effectively using it as a synonym for "desirable" or "normal."

Bob: "My father is terribly ill at the moment, but the doctors say this new treatment will save his life."
Alice: "That treatment is unnatural. You need to accept that it's your father's time rather than trying to fight it."

Obviously, Bob's father is unlikely to consider himself better off dead than alive. This fallacy is sometimes combined with Retrospective Determinism, arguing that a given event was "just the way things are" and hence should not be regarded as negative. "It's nature's way." See below for this variant.

This is an expression of the is/ought dichotomy which separates objective science (what is) from ethical behavior (what ought to be). The theories of nature and sciences only provided a description of how the world works, not a prescription for how people should behave. On the other hand, ethics deal not with what is scientifically true, but what is desirable. Hence using science to justify ethics will never work, because, pragmatically speaking, ethics cannot be tested in nature. Unlike the laws of physics, the laws of morality can be broken and science cannot prove the transgression as inherently wrong. Science only knows that murder exists, and cannot prove murder is wrong (this often comes up in What Is Evil?). Science is Above Good and Evil. Note that some philosophers disagree with this, but their view is not in the majority presently. Scientific facts can inform ethical decisions though (such as whether tobacco is harmful and thus immoral to advertise).

It can also can arise from a fallacy of ambiguity since the words "normal" and "natural" have two meanings: "what is", and "what should be".

On the other hand, not providing any evidence whatsoever (such as through an ontological argument or Circular Reasoning) got you denounced as a liar and a charlatan. This led to widespread use of using every scientific discovery to justify a behavioral or moral standpoints.

In politico-religious discussion by Moral Guardians, the phrases "homosexuality is (not) normal/natural because no homosexual animals" and/or "Rape is less sinful than masturbation because procreation is natural" epitomize this semantic and logical problem.

The entire fallacy of using nature to justify a moral standpoint can be pointed out by pointing out that Nature Is Not Nice; it's rife with disease, natural disasters, parasites, predators, murder, rape (because it fulfills the natural purpose of procreation) and other ghastly things, while on the other hand, "unnatural" civilization made people behave more morally, allowed ethical philosophy to be conceived, and made the rates of mortality and suffering descend fast. Users of this argument also conveniently show that humans are, in fact, acting according to their nature (the hunger drive) and it is therefore natural, as are their most basic resources. Somewhere down the line of turning these resources into beneficial tools do these lose the label natural.

Furthermore, how does one decide what is natural and what is not? Some might say that which is created or done by humans is not natural, and everything else is. But beavers create dams — is that unnatural? What magical ability do humans have to corrupt everything they create? The fact is, humans are part of nature, animals just like beavers, and therefore everything they create is also part of nature. In a very real sense, everything is natural; if it were not, it could not exist.

This fallacy is not limited to use by Moral Guardians, however, and non-Moral Guardian people can end up using this as well; for example, the use of natural selection to justify Social Darwinism and sociopathy. Another extreme example is that we should all become hedonistic Straw Nihilists because as aforementioned, there's no natural evidence for any kind of moral behavior except eating and fucking.

In moral philosophies, ethical non-naturalism, existentialism and other no-need-for-proof moral codes attempt to defy this trope, but are often unpopular because as said, there's no natural evidence to follow for everybody.

This is related to Science Is Bad. Frequently results in All-Natural Snake Oil. An Alien Non-Interference Clause is an attempt to force this onto another species in their relations to our own. May also be related to The Farmer and the Viper, if someone uses "it's my nature" as an excuse/justification for an evil act. A specific example is New Media Are Evil.


    open/close all folders 


  • Any commercial that tells you its product is all-natural or accuses its competitors of using artificial ingredients. Less directly are commercials for foods that depict rolling hills, farmers in fields with tractors, rivers winding through mountain ranges, or attractive people leisurely sitting on park benches or exploring national parks when talking about themselves; or when talking about their competitors, depict scientists in sterile white laboratories pouring brightly-colored chemicals, large industrial machines mixing and packaging the food, or people doing math on chalkboards.


  • In Troll 2, an evil witch is able to convince someone to drink a steaming green broth that has just turned someone else into green goo because "it is made from vegetable extracts".


  • In the Discworld novel Carpe Jugulum, King Verence is talked into drinking brose after being told "It's got herbs in", on the assumption it must be healthy. He spends most of the remainder of the book foaming at the mouth and randomly attacking inanimate objects. This, however, turns out to be useful. It should be noted that brose is what the Nac mac Feegle, six-inch pictsies who can drink their weight in lamp oil with no ill effects, drink to get their spirits up before marching into battle.
    • Similarly, the popular drinks Scumble (made of "mostly apples") and Splot containing such vaguely defined ingredients as "tree bark" and "naturally occurring mineral salts".
    • Pratchett has a lot of fun with this trope; both Verence and his wife Magrat fall prey to it on a regular basis, usually for the worse (in Witches Abroad, teetotaller and lightweight Magrat drinks a third of a bottle of absinthe because she vaguely recognizes it as involving wormwood, after which point she, Granny Weatherwax, and Nanny Ogg start calling it "herbal wine"). In another book, Ankh-Morpork's notorious CMOT Dibbler is making himself a killing off a particularly desperate dandruff sufferer selling herbal shampoo "now with more herbs!" One character notes, "throw a bunch of weeds in the pot and you've got herbs."
    • In The Fifth Elephant, when Acting-Captain Colon says he's opposed to "unnatural things" like Sonky's contraceptives, Lord Vetinari replies "You mean you eat your meat raw and sleep up a tree?"
    • Vetinari also takes a dig at the Appeal to Nature in Going Postal: "Freedom may be the natural state of mankind, but so is sitting in a tree eating your dinner while it's still wriggling."

     Live-Action TV  

  • The Sarah Jane Adventures, where aliens convince millions of people to drink a new energy soda that contains alien parasites called "Bane" simply by claiming that Bane is "organic" (and by extension "healthy").
  • Eureka had an episode where everyone was becoming dumber, and the supposedly-a-genius farmer didn't think the additives she were using were bad, since they were "organic"...In a town of super-geniuses, granted lacking in common sense sometimes, this seemed rather glaring in its stupidity.
  • Parodied in a Fry and Laurie sketch where a doctor is offering his patient cigarettes as a cure. "Oh, herbal cigarettes?" says the patient. "That's right, yes. The leaf originally comes from America—it's called tobacco" and "It's a perfectly natural leaf."
    • Another Fry and Laurie sketch had a bedtime drink containing "nature's own barbiturates and heroin".
  • In Cosmos A Space Time Odyssey, Neil deGrasse Tyson points out that an appeal to nature was used to justify using the dangerous gasoline additive tetraethyllead, or "leaded" gasoline. Part of the campaign General Motors used was simply pointing out that lead was a naturally occurring element in the environment. Likewise, paint companies would resort to similar appeals. Long before the 60's, lead's toxicity was well established to scientists, but the public outcry wasn't there. To a lay person, the appeal to nature could be convincing. A person with even a modest amount of knowledge of chemistry could say, "As are arsenic, mercury, and uranium; should I be ingesting those, too?" To this day, the cost of lead poisoning is staggering. A study available on the web at the website of the NIH of the United States puts the return on investment of eliminating lead at about 1700-2100%. Links between lead levels and criminality (controlling for other factors, such as income, neighborhood, and race), lower IQ, poorer school performance, and increased medical expenditures are uncontroversial in modern medical science. This fallacious argument to keep using lead led to terrible consequences we're still paying for today.

     Video Games  
  • Jade Empire is a pretty severe offender. Much of the setting's backstory revolves around a conflict between the Emperor and the Water Dragon, one of the setting's nature deities. The short version: the Water Dragon allowed (or perhaps even caused) a severe drought that nearly crippled the Empire and cost thousands of lives, and the Emperor captured, tortured, and maimed the Water Dragon to force her to make the drought stop. While the other characters never waste an opportunity to condemn the Emperor's actions, none of them ever do the same for the Water Dragon and automatically dismiss any suggestion that the Water Dragon's drought was anything but 100% justified, and this trope, along with Omniscient Morality License, is strongly implied to be the reason. Granted, the setting and culture are based on Chinese mythology, and the characters' unwillingness to question the morality of a goddess makes sense in context, but to a modern viewer, the Values Dissonance, while purposeful, can be pretty jarring.
  • In Telepath Tactics, the anarchist Zimmer tries to invoke this after learning that the local constabulary were paid off by their opponents, but is immediately debunked by Phoebe.
    Zimmer: But to be honest, I prefer it this way: individuals duking it out like nature intended, instead of an unaccountable state picking winners and losers...
    Phoebe: [She sighs heavily.] Nature does not have intent, Zimmer; it is nothing more than a series of systems. Civilization is no less "natural" than running alone, naked and delirious, through the woods.


  • See All-Natural Snake Oil for a lot of examples of this.
  • This is the underlying logic of The Social Darwinist and often the Evilutionary Biologist; there are various versions, typically some variant of:
    • The strong deserve to rule over and / or destroy the weak, because it's nature's way.
    • Mankind has perverted the course of nature, so society needs to be destroyed / someone needs to genetically engineer a killer something to prey on man / whatever.
  • This might also be why people think cybernetics will eat people's souls.
  • A lot of Lotus-Eater Machine plots tend to run into this, particularly ones where there's nothing at stake except "freedom". A big part of what makes the Lotus-Eater Machine so appealing is the fact that, more often than not, the "victim"'s quality of life is much higher inside the machine than outside it, and yet it's almost always dismissed by the characters anyway because "it's an unnatural fantasy," "it's not real," "humans weren't meant to be (that) happy," and other flawed reasons.
  • Frequently comes up in rants about why New Media Are Evil.

     Real Life  
  • This is often used with regard to social issues; for example, the more extreme opponents of feminism argue that the natural order is for males to be dominant, so women should not be allowed the same rights as men. This argument is itself unsound, as many species, will attest to: in quite a lot of species the lowest-ranking females is well above the most powerful males — including our closest living relative, the pygmy chimpanzee. Some species, such as the whiptail lizard, have even done away with males all together and created a Real Life One-Gender Race.
    • Any politician who remembers how he was "raised at the farm" and he never saw any homosexuality there... biologists know that homosexuality is common between animals.
  • The overuse and misuse of antibiotics, pesticides, and herbicides (and the resulting resistance and health and environmental effects) have led quite a few people to denouncing all use of them per the Appeal to Nature, right down to claiming a Conspiracy Theory that any or all of the above are part of a Depopulation Bomb conspiracy. The problem is that while overuse and misuse needs to stop, to obliterate these products entirely (or allowing their continuing overuse and misuse to do just that by creating 100% resistance) will lead to The End of the World as We Know It. Especially in regard to antibiotics - these are the medications that turned such diseases as pneumonia, syphilis, and bubonic plague from terminal pandemic illnesses into quickly curable illnesses. In the same way, while modern pesticides and their manufacture are bad for the environment and are carcinogenic and mutagenic, they are also a vital part in the control of disease-spreading, food-ruining, or venomous insect pests, especially for people and situations where setting up more natural methods of barriers and predators would be problematic.
  • The idea of the superior "Noble Savage" has popped up repeatedly for centuries. The superiority of the primitive person or beasts over civilized man has been a repeated trope. Of course the fact that Nature Is Not Nice, 25% of men died from war, 20-50% of children never left childhood, and that polygamy (something commonly opposed nowadays) was necessary to repopulate after those last two points is conveniently ignored.
    • Lampshaded by a December 1977 MAD Magazine article on "The History of Medicine": "In the Stone Age, very few people had childhood illnesses. The reason for this was simple: very few people had childhoods."
  • A famous example from mathematics is Giovanni Saccheri's attempt to prove the parallel postulate. In his book, Euclid Freed of Every Flaw, Saccheri assumed the postulate was false and tried to derive a contradiction. Instead, he derived results that got stranger and stranger (but remained logically consistent), finally concluding that they were "repugnant to the nature of straight lines". Saccheri didn't know it, but he was developing what we now call hyperbolic geometry — a fruitful field of study that just doesn't work the same way Euclidean geometry does.
  • Eric Schlosser mentions this in Fast Food Nation: sometimes artificial things are better for you than natural ones. The example he uses is almond flavoring; extracted naturally, it contains trace amounts of cyanide.
    • That's the nature of "natural" and "artificial" ingredients, at least as defined under United States law. Often, the active chemical is identical, the difference being that the "artificial" ingredient is synthesized directly from its components as a pure substance while the "natural" ingredient is extracted from some naturally occurring source but usually includes contaminants that aren't removed in the extraction process.
  • Lots of "herbal" supplements. The idea being that because they are "herbal" they can't be harmful. Belladonna, also called deadly nightshade, which is a poison, is an herb (in small amounts, it can be used as a soporific, but still). This also ignores the fact that anyone can be allergic to a plant that is not usually poisonous, making it harmful to him/her.
    • In an extension of this, multiple supplements are now claiming (word for word) "It's all natural, so there are no side effects." Depending on the product, this is either a case of misleading truth (it's natural AND there are no side effects), a case of Blatant Lies (it's natural, and there are some side effects, but that's not because it's natural) or a case of selective omission (it's all natural, and there are no side effects... There are no PRIMARY effects either, this is basically a placebo to help you psychologically while you do the rest of the stuff we tell you. THAT'S what makes you healthy.)
  • In German, the word "Chemie" (literally "chemistry", but in this case a more accurate translation would be "chemicals") is often used to refer to certain food additives and basically any other substance that the speaker considers to be "unnatural". The fallacy is that, technically, water is a chemical too, and so is everything else. So if you're condemning the use of "chemicals", you are basically against every substance known to man, the healthy ones as well as the unhealthy ones.
    • Russian has a similar phrase, "Himya s physikoi" (translated literally as chemistry with physics).
  • War is often said to be bad because it's a human invention, which isn't really true.
    • Also not human inventions: Agriculture (ants and termites, among others), division of labor (multiple species), language (disputed- multiple species), ownership (disputed- multiple species), tool use (apes, octopuses, crows, and others), or... well, actually, we didn't invent a lot. We mostly just do a lot of things other species do, but do it on a grander scale. What makes humans, or perhaps even just certain cultures, unique is the method in which we adapt and pass information on, forming increasingly complex societies that have greater ecological impacts.
      • We didn't even invent paper. Wasps did that. We did, however, invent writing on paper—and writing in general, to be perfectly blunt. Wasps mostly just live in their paper, which incidentally includes shitting in it. (If you've ever seen a wasp's nest, you might notice black liquid dripping from it. That's wasp poop. You're welcome!)
  • Both sides of the LGBT issue are guilty of this, claiming either that it is unnatural, and therefore wrong, or that it is perfectly natural, and therefore acceptable. This is particularly jarring since nobody really seems to have any idea what they mean by "natural" in this context.
  • This is a point in arguments against preservation of endangered species. Extinction is a natural event that occurs when a species is no longer fit to survive in its environment. Attempting to repopulate a Dying Race works against the natural order in both the target species as well as those that share a niche. Not an example of the fallacy when referring to animals that have specifically become endangered due to human activity, such as whaling.
    • This is what happened with a polar bear named Knut: His mother rejected him after he was born, and some people suggested to let him die because that's how it works in the wild (polar bear mothers reject any cubs if she's already raising one or two, leaving them to die), never mind the fact that polar bears are endangered and this was a big step up in learning how to keep them from dying out. Also, he wasn't in the wild.
  • A mode of thought that pops up with many above topics such as war and the LGBT issue is the idea that if a human practice has a parallel among some other species, then it is acceptable. Proponents of this idea tend to forget that animals also have plenty of habits that pretty much everyone would consider grotesque, bizarre, or downright reprehensible if practiced by humans, even animals as closely related to humans as chimpanzees. This is what gave rise to the rhyme: "monkeys throw their poo, should we do so too?" It should be noted that it is usually the people who are against LGBT issues who claim that homosexuality isn't normal because "It doesn't happen in nature." This trope is merely the response which utilizes the Heteronormative Crusaders' logic.
  • This fallacy has been popping up in pop ethical philosophy ever since evolutionary biologists were able to explain why altruism is so widespread. People introduced to this for the first time aren't told about how atrocities can be committed as a group, it only means it's possible for ethical behavior to evolve and does nothing to define what is and isn't ethical in the first place, or the ontological issue of whether God intended for humans to evolve in this manner or did so by entirely naturalistic means.
  • Back in the days when they sold radioactive water to kill off germs and "restore your youthful vigor", the ads reassured potential customers that it wasn't dangerous to their health because "Radium is not a synthetic drug or medicine but an entirely natural element, present in many hot springs famous for their recuperative properties."
  • The argument in favor of the tropes My Girl Is Not a Slut and I'm a Man, I Can't Help It. The idea is that men are supposed to impregnate as many women as they can, and thus have a need to be promiscuous, while women are supposed to be the ones that are choosy.
  • Many a Straw Vegetarian has used this argument to demonstrate that a meat-inclusive diet is unnatural and unhealthy for humans.
    • Similarly, proponents of such diets as the Paleo Diet decry the consumption of grain as the source of all of humanity's chronic health woes (cancer, heart disease, hormonal imbalances, dementia, obesity, and even male-pattern baldness).
  • In Nazi Germany, propaganda glorified the "natural order". And according to the Nazis, it was the "natural order" that the strong should dominate the weak and that the "master race" should subjugate the "inferior" races. This worldview is illustrated in Education for Death when the Nazi teacher uses the story of a fox devouring a rabbit to teach the "lesson" that weakness is bad and strength is good.

Looks like this fallacy but isn't

  • Natural Law Theory, in which the nature appealed to refers to the essence of something, not the wild and woolly outdoors (though its critics argue that it can't help but devolve into this).