Exocrine pancreatic insufficiency (EPI) is the inability to produce sufficient pancreatic enzymes needed to digest fats, carbohydrates, and proteins. This difficulty in digestion leads to poor absorption of nutrients which commonly causes weight loss despite a normal or increased appetite.

An accurate "diagnosis" is crucial if you ever hope to solve the problem. Dr. Liz Stelow, DVM, DACVB As published in Psychology Today 9/01/2015