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The allergen first enters the body.
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The immune system recognizes a "foreign invader" and antibody is formed. An antibody is a protein in the body that detects harmful substances.
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The allergen enters the body again.
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The antibody attaches itself to the cells throughout the body. Now, when the allergen is present again it is ready.
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The antibodies throughout the body now detect the allergen and the allergen bind to them.
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A signal is now sent out to the body and it releases a large amount of histamine. Histamine causes an immune response and triggers the reaction.
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Food allergens and food intolerances may look very similar but make sure that before any drastic moves are made to know which is occurring.
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