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A food intolerance, also known as non-IgE mediated food hypersensitivity or non-allergic food hypersensitivity, refers to difficulty in digesting certain foods. It is important to note that a food intolerance is different from food allergy. A food allergy triggers the immune system, while a food intolerance does not. Some people suffer digestive problems after eating certain foods even though their immune system has not reacted – there is no histamine response. Foods most commonly associated with a food intolerance include dairy products, grains that contain gluten, and foods that cause intestinal gas buildup, such as beans and cabbage.
What are the causes of a food intolerance? It can be difficult to determine whether the patient has a food intolerance or allergy, because often signs and symptoms overlap. When it is an allergy even small amounts result in symptoms, as may be the case with peanuts, according to James Li, M.D., Ph.D., Mayo Clinic allergy specialist. With a food intolerance trace amounts will usually have no effect. Doctors can also test for Immunoglobin E (IgE) antibodies. A symptom is something the sufferer feels and describes, such as pain or discomfort, while a sign is something others can detect, such as a rash.
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