Allergies: How are Allergies to Food Diagnosed?

Doctors suspect a food allergy based on the patient's history. Skin tests with extracts from various foods can then be initiated. A reaction does not mean that an allergy exists, however, if no reaction occurs, then an allergy is ruled out. If the person does have a reaction, an oral challenge may be implemented. In this test, the doctor observes the patient as they eat various food extracts which are contained in milk or applesauce. If no syptoms develop, the person does not have allergies to food.

Another way to identify the food allergy is an elimination diet. The person stops eating all foods that may be causing the symptoms for about 1 week. The doctor provides the diet the person is to follow. As many foods have hidden substances, such as wheat flour in rye bread, only pure foods which are identified by the doctor should be eaten. As one is never sure what ingredients exist at a restaurant meal; restaurants should be avoided during the testing. Foods are added back one at a time for a few days to a week, prior to introducing another food. If symptoms occur, the allergen is identified.