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The allergen enters the body when ingested within the food. If this is the first time it has entered it won't respond negatively outwardly.
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As a result of the allergen entering the body for the first time, an IgE antibody is formed and attaches itself to the tissues in cells all over the body.
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After the IgE antibody forms all over your body cells, it is prepared for when the allergen is in your body again, this time resulting in a reaction.
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Once the allergen combines to the IgE antibodies, it begins to send signals for the body to fight back.
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Once the antibodies attatch to allergen, the body sends signals to send out histamine which is a compound to trigger an immune sytem response.
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The immune system is triggered and causes the allergic reaction.
