Food allergy is an immunoglobulin E or IgE immune system reaction which is generally described by shortness of breath, hives, upset stomach and in certain cases anaphylaxis. The most likely food allergies people have are allergic reactions to shellfish, nuts, wheat and or dairy. According to the Food Allergy and Anaphylaxis Network, only about 4 percent of the United States population has a food allergy.

Food intolerance, conversely, is much more commonplace than food allergies are. These medical conditions are described by those who suffer from them, as migraines, digestive disorders, chronic fatigue, obesity, skin disorders, aching joints, and many behavioral issues. It is believed that at least 70 to 80 percent of the United States population, including children, has food intolerance. Unfortunately for countless sufferers, their food intolerance symptoms could be identified as issues specific to each person so their symptoms are treated but not the causes.