Hello dear,welcome to Ask a doctor service. I reviewed your query and here is my advice. Fat in your stool suggests that your digestive system isn’t breaking down food adequately. Your body may not absorb the useful parts of the food you eat, including dietary fat. common causes of malabsorption cystic fibrosis. chronic pancreatitis. lactose intolerance, the inability to digest a sugar in milk products because you lack the enzyme lactase celiac disease, when you have a sensitivity to gluten, a protein in wheat and certain other grains biliary atresia, blockage in the ducts that carry bile from the liver to the gallbladder Whimple disease, a bacterial infection of your digestive system that affects how your body breaks down fats and carbohydrates Crohn’s disease, one of several conditions under the label inflammatory bowel disease (IBD), an inflammation of the gastrointestinal tract Hope I have answered the question. Let me know if I can assist you further.