Diagnostic elimination diet, sensitization tests and dietary history are all crucial elements for the diagnosis of food allergies. The goal is to make sure that that the nutritional needs of the child remain the same during the entire elimination process of the allergen from the diet. A detailed diet history, possibly with evaluation of a symptom diary, is the basis for creating an individual elimination diet. Strict diets, such as oligo-allergenic based diet, are no longer used, as the risk of severe dietary deficiencies in children is too pronounced. An elimination diet needs to incorporate the food preferences of the child and should not restrict the quality of life of the child and its family.