One should take some medicine so that gastric juices don't burn the stomach lining. I consulted a Gastroenterologist who prescribed a syrup containing sucralfate, oxetacaine and simethicone to be taken six hourly while fasting. It forms a coating on the stomach so that digestive juices don't burn it. Also it is safe as not absorbed in the body but excreted through urine. You all can dare to fast using it.