Hi. Thanks for your query. Gilbert s disease is known to cause recurrent jaundice. But not much known to cause loose stool unless there is less bile in the intestines and more fat in the food. Since your son is going for bowel movements after each meal, this indicates that he may have IBS, the irritable bowel syndrome or there would be an inflammatory process going on in the intestines like diverticulitis, appendicitis or lymph node enlargement or so. I would advise him the following: Get stool tests on three consecutive days. To rule out diabetes and hyperthyroidism. CT scan of the abdomen with contrast. This will find the disease and get treated properly.