ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Hygiene Hypothesis Explained

Updated on February 9, 2013

The hygiene hypothesis is one possible hypothesis that attempts to explain the increase in autoimmune diseases (such as asthma and allergies) in modern industrialized society.

Wikipedia defines the hygiene hypothesis as ...

"the hygiene hypothesis is a hypothesis that states that a lack of early childhood exposure to infectious agents, symbiotic microorganisms (e.g., gut flora or probiotics), and parasites increases susceptibility to allergic diseases by suppressing natural development of the immune system"

Autoimmune disease has tripled in the last few decades and affect roughly 24 million Americans.[9] reports in 2010 that allergies of all types (including food allergies) are on the rise in developed countries including the United States.[1]

In 2011, National Public Radio website blog says that asthma in the United States is up 7.7% from what it was in 2005.[2]

Asthma and allergies are autoimmune type conditions where the body is attacking its own cells due to the fact that the immune system in not able to precisely distinguish "friend" or "foe" agents.

MedPedia says that "Allergy and autoimmune disorders result when the immune system overreacts or reacts inappropriately."[4] Paper on says that "Allergy and autoimmunity result from dysregulation of the immune system."[3]

What is the Hygiene Hypothesis

The hygiene hypothesis is defined as follows in a paper by Becker ...

"The hygiene hypothesis is a widely held theory of the etiology of asthma and atopic disorders which builds on observations of rural versus urban distribution of disease. It suggests that cleaner environmental conditions in westernized countries, as compared to developing countries, play a role in the increase of the prevalence of these disorders in western countries"[8]

The hygiene hypothesis suggests that when children develop in overly sanitized environment, their immune system do not grow strong enough. Just like muscles have to be stressed a little to make it stronger, so does the immune system.

In the late 1990s, Dr. Erika Von Mutius found that the rates of allergies and asthma in the children of more polluted East Germany was less than the more sanitized modern West Germany.[5]

Another study[7] looked at the rates of exercise-induced bronchospams in children in Ghana. Think of exercise-induced brochospams as asthama that is induced by exercise. They found that the rates in 2003 (when the country had developed social-economically) were higher than the rates in 1993 -- almost doubled the rates.

A paper from the Academy of Science, Paris France says ...

"Western countries are being confronted with a disturbing increase in the incidence of most immune disorders, including autoimmune and allergic diseases. Converging epidemiological evidence indicates that this increase is linked to improvement of the socio-economic level of these countries. Epidemiological and clinical data support the hygiene hypothesis according to which the decrease of infections observed over the last three decades is the main cause of the incessant increase in immune disorders."[6]

Dr. Mark Hyman also mentions that in developing countries where hygiene is poor and infections common there is very little allergy and autoimmunity. This is referenced on page 188 of his book The UltraMind Solution where he also writes ...

"We are becoming hypersensitive to our environments, perhaps because we live in an oversterilized environment and our immune systems don't mature properly. Or because we are eating hybridized and genetically modified (GMO) foods full of antibiotics, hormones, pesticides, and additives that were unknown to our immune systems just a generation or two ago."

So there he provides two possible explanations to our bodies over-sensitivity to our environments. One is the hygiene hypotheses and the other is the prevalence of pesticides and additives, etc.

Other Autoimmune Disease

Celiac disease is another autoimmune disease where the body's immune system attacks its own tissues (in this case the small intestines).[9]

In the book Celiac Disease, Peter Green cites a study that the rate of celiac disease is much higher (1 in 107) in cleaner more modernized Finland than in Russia where the rates were less (1 in 496 occurrence). Since the genetic predisposition to celiac disease and the wheat consumption were about the same in both countries, some suggest that the difference is due to the environment.

Green writes that the hygiene hypothesis ...

"proposes that an exposure to infections and unhygienic conditions early in life somehow conveys protection against the development of allergies."


No one is definitively saying that a clean environment is the cause of allergies and asthma either. The hygiene hypothesis is just that -- a hypothesis. It only "suggests a possibility". It does not prove.

Many people do not believe in the hygiene hypothesis (me included). Paul Jaminet is also not a strong believer in it as mentioned on Chris Kresser podcast.

Of course, we do not want to go back to pre-modern times when bad bacteria kills many people. We do still want to continue to use vaccines and anti-bacteria soap.

But perhaps we need not be overly concerned with children playing in the dirt.


    0 of 8192 characters used
    Post Comment

    No comments yet.


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)