1 This condition is caused by malfunctioning of the stomach muscles; and is treated with medication to stimulate the muscles. 2  Celiac disease or gluten intolerance is another common digestive system disease. 3  It is a type of autoimmune disease that affects the small intestine.ommon Digestive Diseases. As mentioned above, the organs of the digestive system may develop different medical conditions. While some of them affect a particular organ or a part of that organ, some others affect more than one organ of the system.
Fish oil, omega-3: A class of fatty acids found in fish oils, especially from salmon and other cold-water fish, that acts to lower the levels of cholesterol and LDL (low-density lipoproteins) in the blood. Omega-3 fish oil is therefore thought to be a neutraceutical, a food that provides health benefits.
Krill oil. Krill oil is an extract prepared from a species of Antarctic krill, Euphausia superba. Two of the most important components in krill oil are omega-3 fatty acids similar to those in fish oil, and phospholipid-derived fatty acids (PLFA), mainly phosphatidylcholine (alternatively referred to as marine lecithin).