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  a person eats the food that they are allegic to
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  the body creates an antibody that detects harmful substances
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  the antibody connects to cells to prepare the body if that allergen enters the body again
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  if the allergen enters the body again it binds to the antibodies and the body releases alot of histamine
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  this causes irritation and the body begins to swell
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  the result ends in hives, shortness of breath, or even worse possibilities