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A person eats the allergen that causes an allergic reaction
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The body creates an antibody that detects harmful substances
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The antibody attaches itself to cells found in tissues in the body to prepare the body if the allergen enters the body again
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The allergen attaches to the antibodies and sends out signals to the body to release large amounts of histamine when the food allergen enters the body again
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The histamine causes irritation and swelling in parts of the body.
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The result of this irritation varies in person to person, from mild hives to shortness of breath
