All food allergies are caused by an immune system dysfunction. Your immune system identifies certain milk proteins as harmful, triggering the production of immunoglobulin E (IgE) antibodies to neutralize the protein (allergen). The next time you come into contact with these proteins, these IgE antibodies recognize and signal your immune system to release histamine and other chemicals. Chemicals and other bodies of histamine causing a series of allergy symptoms. Histamine is partly responsible for most allergic reactions, including runny nose, itchy eyes, dry throat, rashes, hives, nausea, diarrhea, labored breathing and anaphylactic shock.
There are two types of protein in cow's milk can cause an allergic reaction:
Casein is found in the solid part (curd) of milk that curdles
Whey, which is in the liquid part of milk that remains after milk curdles
You or your child may be allergic to milk proteins from one or allergic to casein and whey. These proteins are not only present in milk - but also found in processed foods. In addition, most people who react to cow's milk are also allergic to milk from sheep, goat and buffalo. Less commonly, people allergic to cow's milk are also allergic to soy milk.
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