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Adult orr child eats a type of food or substance they are allergic to and thats causes an allergic reaction for the first time
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after that person eats the food, the body will then create an antibody/protien that finds other harmful substances.
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the antibody attaches itselft to cells found in tissues throughout the body and it will prepare the body for if/when that allergen enters the body again
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After entering again, it binds to the antibodies and sends out signals to release large amounds of histamine.
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The histamine will then cause irritation and swelling in differnet parts of your body.
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Irritation varies among people (mild hives, shortness of breath, anaphylaxis).
