The Hygiene Hypothesis Definition, Information - …
International research has noted that Asthma rates have doubled across the civilized world since 1980. They have been looking into this, and in 1989, one of the researchers has suggested the “Hygiene Hypothesis” which many others have also looked into over the last two decades.
Evolution: Library: Hygiene Hypothesis - PBS
The hygiene hypothesis suggests that the lack of exposure to parasites and microorganisms interferes with normal immune system function, which can then lead to the development of food allergies, asthma and autoimmune disorders. In sanitary environments, the immune system is under-stimulated, but this system isn’t designed to just sit back on the sidelines doing nothing. The result? The immune system focuses less on actually fighting off infections, and more on fighting things that it shouldn’t, such as nuts, eggs and other foods.
Over two decades ago, the idea that there is such a thing as too much cleanliness was first proposed by David P. Strachan in his Hygiene Hypothesis. The idea behind this theory is that a lack of early exposure to the types of germs and stimuli that people used to have is the cause of allergies. In developing nations and in earlier time periods families tended to be larger then today. It was uncommon to have just one or two children; the idea behind having more children is that the elder child exposes the younger children to more germs and in turn the children end up having to develop a stronger immune system because the immune system has been fully developed by all the early stimuli [1,2]. This idea of exposure to other children has also held true for children who attend daycare at an early age. Daycare children tend to develop fewer allergies then those who are never in such environments. Research has gone even farther to say that children who are exposed to hepatitis A or the measles are less likely to have certain types of allergies .
Hygiene Hypothesis and Autoimmune Diseases | …
Simply put, the Hygiene Hypothesis is the theory that naturally occurring infections somehow immunize the body against the development of asthma, allergic diseases and autoimmune disease. If the body sees a lot of these natural infections, the immune system is skewed away from allergy and autoimmune disease. If it doesn’t, and it gets too many antibiotics in the first year of life, and, in essence, its environment is “too clean”, then the immune system moves towards allergy.
The hygiene hypothesis: current perspectives and …
It is important when talking about allergies to have some working knowledge on what happens when an individual has allergies or an allergic attack. Allergies are an extreme and inappropriate reaction by an individual’s immune system to what typically is a common harmless stimuli found in a normal environment; the body takes something such as hay, food, pollen, etc. and has a hypersensitivity reaction to it. The body ends up activating its white blood cells (these are the cells that defend the body against any foreign bad stimuli), which typically are what help humans ward of virus and bacteria, for example the flu or an infection, which results in an inflammatory response. This inflammatory response manifests itself in different ways: asthma, eczema, hives, runny nose or eyes, coughing etc.
Allergies and the Hygiene Hypothesis - News Medical
The Hygiene Hypothesis is one theory that may help to explain the relationship between the environment itself and the development of allergy. It suggests that the immune system is affected by exposure to endotoxin in the environment. Immune tolerance to potential allergens could result when exposure to certain microbial derivatives occurs at certain stages during the maturation of the immune system. Less exposure to endotoxin in dirt would result in more allergies. In other words, there is a preventative benefit in being in a not-too-clean environment, at least in certain people. There is some evidence that children on farms have fewer allergies and that some with pets have fewer allergies. However, timing and genes would still play a large role.
The Hygiene Hypothesis | Fight the Cause of Allergy
Hygiene is one of many theories that attempt to explain the increased incidence of allergy and asthma (which are not interchangeable). The important question is whether we have a more toxic environment or a more susceptible population. It is certain that allergen exposure alone does not explain the increased incidence, but the hygiene theory is not sufficient as an explanation. It may not be the main factor behind the protective effect of living on a dairy farm and it does not explain increased incidence of asthma in poor inner city neighbourhoods.