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First is the consumption of the food that is an allergen to the body.
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second there is no negative responce from the body but the body begins its work for the next time the food enters.
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Third the IgE antibody is formed and it attaches to cells around the body.
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Fourth the person consumes the foor again and the allergen clings to the IgE antibodies.
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Fifth, signals are sent out so that the body can give off large amounts of histamine.
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sixth, the body starts its reaction type, swelling, irritation, shortness of breath, etc.