Disclosure: The following is a article from our paid sponsor. If you suffer from digestive upset and other stomach issues after eating certain types of foods, you may be intolerant to gluten. This substance is typically found in many types of bread and products that contain wheat, rye, malt, and sometimes barley. The inability to digest gluten is known as celiac disease, and it can cause damage to the intestines. While only your doctor can diagnose celiac disease, he or she may Continue Reading