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Why do 1 in 5 people have an allegy of some sort ?
What do you believe are the main allegies in the world ?
Before the immune system is fully developed (before seven years of age), the self ..meaning in this case the human organism..has to make a memory of what is it's own (not foreign) so that later on in life it can eliminate that which is foreign to itself..a defense mechanism...In this instance..it would be better to bring up a child in a country where he would be exposed to different diseases..it would make his immune system respond faster later on in life, to exposure to those "foreign" bodies (bacteria, virus).
Allergic reaction is response to those foreign bodies, via a second route, the production of histamines..as compared to first line of defense, T-Activated macrophage cycle of elimination.
The production of histamines as evidenced by sneezing, and all other reactions can be induced upon repeated exposure to anything that has an antigenic site.
Allergy is an autoimmune condition where the body immune system is unable to distinguish foreign object correctly and attacks own cells instead.
I wrote about the various possible causes of rise in autoimmune disease here ...
http://blissfulwriter.hubpages.com/hub/ … n-the-Rise
Personally, I think it is due to increase use of pesticides and other environmental toxins.
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