Elimination Diet

Elimination diet n. A diet designed to detect what foodstuffs cause allergic reactions by separate and successive withdrawal of foods from the diet [more]Elimination diet - Community and Resources

The next step some healthcare providers use is an elimination diet.
In this step, which is done under your provider’s direction, certain foods are removed from your diet. You don’t eat a food suspected of causing the allergy, such as eggs. You then substitute another food—in the case of eggs, another source of protein. Your provider can almost always make a diagnosis if the symptoms go away after you remove the food from your diet. The diagnosis is confirmed if you then eat the food and the symptoms come back. You should do this only when the reactions are not significant and only under healthcare provider direction.
Your provider can’t use this technique, however, if your reactions are severe or don’t happen often. If you have a severe reaction, you should not eat the food again.
  

certain foods are removed from a person’s diet and a substitute food of the same type, such as another source of protein in place of eggs, is introduced.