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When the allergen is eaten, an IgE antibody is formed
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This antibody then attaches itself to cells found in the tissues of the body
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Now, the body is primed for when that allergen enters the body again
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When the allergen is ingested again, it binds to IgE antibodies and sends out signals to the body
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These signals the the body to release large amounts of histamine.
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This causes an allergic reaction
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When someone first eats a food allergen, there will be no physical side effects