One of the best kept secrets of medicine is the role of the digestive tract and its relationship to our immune system. The so called Leaky Gut Syndrome; the fact that there's a lot of immune cells in the digestive tract called the Galt system, probably 60 -70 percent of all our immune cells are in the digestive tract. The role of the intestinal tract in keeping us well is a new and enormous topic that very few endocrinologist know anything about. Ten or fifteen years ago, they didn't even know what a probiotic was.