Host: What are symptoms of food allergy? Bob Gravani: The symptoms of food allergy involve a number of body systems. It could be the Respiratory system and people might have trouble with breathing, there might be wheezing and those kinds of issues. Runny nose etc. It could also involve the skin in terms of rashes or eczema type reactions. It could involve the Gastrointestinal tract wherein diarrhea or vomiting might be involved. In very severe case it might involve the Cardiovascular system. The severity of this symptoms can really be very, very mild from a skin rash all the way to very, very severe and life threatening. A lot of what determines that is the sensitivity of the individual and the allergencity of the specific protein involved.