Digestive system immune response

Your immune system must determine whether or not to develop a tolerance to everything you put into your mouth. Whenever you try a new food, it must decide, "Do I like this or do I attack and kill it?" You are always ingesting bacteria and other substances with your food, no matter how fresh and clean it is, so these must be screened out. While your immune system will "okay" most foods, genetic and other issues may affect its decision. Recent studies also suggest that your immune system’s ability to develop correct tolerances depends a great deal on the balance of good bacteria inside your intestinal tract