Experts believe having eczema increases the risk a child may develop food allergies and other allergic conditions later in life. About one-third of children with moderate to severe eczema have diagnosed food allergies. Likewise, about 30 to 40 percent of all people with eczema also have one or more food allergies. According to a recent study, young children with food allergies are more than twice as likely to develop asthma or rhinitis before age 5, compared to those without food allergies. The risk for respiratory allergies is higher in children who are allergic to milk, egg or peanut. This is also true for children with multiple food allergies (http://www.aaaai.org/).
Chronic respiratory symptoms are not thought to be caused by food allergies. When respiratory symptoms occur during allergic reactions to foods, they occur suddenly and usually are not the only symptom. Instead, they appear alongside other symptoms affecting the skin, gastrointestinal tract and other parts of the body (http://www.aaaai.org/)
People with both asthma and food allergies are at higher risk of experiencing life-threatening anaphylaxis during a food allergy reaction. Research has similarly shown that having a food allergy is linked to having worse asthma symptoms and more hospitalizations from asthma. Igg is the immune response to pathogens like bacteria, viruses, and fungi. It is not the type of response typical to allergens. In an Allergic March the typical sequence is patients develop allergic diseases; starting first with eczema, then followed by food allergy, asthma, and allergic rhinitis aka hay fever. I believe it is worthy to both look for an underlying cause and attempt desensitization. There may be an underlying condition that is linked to the food allergies. Yet, desensitization may also work and alleviate some of the person's suffering.