Many people in the world experience food allergies. And with food allergies, there are food allergy symptoms. It gets complicated because some people may be allergic to certain foods while some people may not tolerate a type of food but not have an allergy to it. The most common types of food allergies are: Peanuts, tree nuts, shellfish, milk and eggs. http://www.webmd.com/allergies/guide/food-allergy-intolerances?page=2 But with the human body the possibilities are endless.
Food Allergies symptoms are responses by the immune system. An intolerance is an unpleasant symptom from eating a food that is not immune system related-like lactose intolerance. For a person to have a food allergy, a person must first be exposed to an antigen(foreign substance) in this case some type of food. The body will produce Immunoglobulin cells. In the cases of allergic reactions these cells are noted as IgE cells. These cells are proteins that occur naturally in the body in varying circumstances. They are antibodies. The body also has Mast cells circulating. The Mast cells contain histamine that is released when bound to and IgE cell. If a person is exposed to a food they are allergic to the body in a sense remembers this and symptoms generally present on the second exposure.
A common example of a food allergy is a young child eating peanuts. It is highly likely that the second exposure to peanuts will illicit an allergic reaction or anaphylactic shock. For the allergic reaction to occur, the person ingests a food they are allergic to. The body produces IgE cells as part of the inflammatory response. These cells attach to Mast cells and the allergic reaction begins. Histamine is released. Food allergy symptoms include increased vascular permeability (fluid shift out of the cells). This can be seen as hives or a rash. Coughing or shortness of breath. Wheezing or stridor (upper airway constriction), runny nose, abdominal cramping or general intestinal distress and nausea and vomiting. Every person may present differently
Anaphylactic shock is a more severe form of food allergy (or other allergy) instantaneous and severe form of this response. All of the above mentioned symptoms may occur but the response is rapid. Within minutes of ingesting a food the person will begin to cough, the throat may itch or begin to rapidly swell. Extremely visible swelling of the lips and tongue may occur. Wheezing and drooling may occur. Hives may be visible. Abdominal pain although a minimal concern at this point may occur. The treatment for anaphylactic shock is oxygen, subcutaneous epinephrine, nebulized albuterol, and benadryl at minimum by Paramedics or emergency physicians. If treatment is not started immediately death will occur due to airway compromise or drop in blood pressure secondary to the bodies immune response. One incident such as this and a person tends to carry an Epinephrine auto injector pen for life to use instantly if similar food allergy symptoms present.
Food allergy testing includes: self reporting, blood tests to check IgE levels after specific foods are ingested, skin prick tests- small amounts of food substances are exposed to the skin and an irritation response is monitored, an oral food challenge-eating a possible “dangerous food” in a dr’s office to monitor the response or simply systematically eliminating foods from the diet to see if symptoms resolve. http://www.mayoclinic.com/health/food-allergy/DS00082/DSECTION=tests-and-diagnosisagnosis