These food molecules are foreign to the human system and, therefore, are prone to induce allergies and sensitization. This, in lay terms, is the probable explanation for the increasing incidence of food allergies. The secretory IgA antibodies work by adhering to undigested food particles and preventing their absorption before digestion is complete. It is a system of almost inconceivable intelligence, because each food particle of untold billions of food particles must be recognized and intercepted in this way. In Chapter 10, it was pointed out that many published studies show the suppressive effects of antibiotics on the systemic immune system.
Several options are available in identifying offending allergenic foods in an individual.
The first and perhaps the best is the elimination-rechallenge diet. It is conducted in the home. Its success, however, depends on rigid control of the diet during the elimination and reintroduction phases. Problems commonly arise when the child is visiting with friends or when at school where the youngster may be able to obtain unauthorized foods. Another approach to identifying problem foods is blood testing.