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Person eats allergen that causes allergic reaction
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After eaten, the body creates antibodies that detects harmful things
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The antibody attaches to call in tissues in order to get body ready for when allergy enters again
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When foods enters again, allergen binds to antibodies and sends signals to release large amounts of histamine.
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The histamine causes swelling and irrational in the body
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The result is different per case. Usually can get hives, shortness of breath and swelling of mouth and lips