These types of foods are identified by our immune system as something harmful have entered our body. In response to our immune system the cells in our body are triggered and as a result they release antibodies known as immunoglobulin E (IgE) antibodies to neutralise the harmful food (the allergen) that has entered in our body. After the immune response the mechanism that takes place in our body works in such a way that whenever you eat even the smallest amount of that harmful food, the IgE antibodies senses it and signals the immune system to release a chemical called histamine, as well as other chemicals, into the bloodstream.
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