Food allergy represents an important health concern in the Westernized world because epidemiologic data show that 6–8% of children below 3 years of age reveal food allergic reactions and about 4% of the general population are estimated to have an IgE-mediated food allergy in the United States and Europe; in addition, epidemiologic studies also evidence the increase in allergy and food allergy in industrialized countries [118]. Here, IGHE is linked to food allergy.