Classification of Fats: C: Derived lipids: Are a class of fat-related substances that contain sterols. A main member of this group is cholesterol. It is a complex fat-like compound found practically in all body tissues, especially in the brain and nerve tissues, bile, blood, and the liver where most cholesterol is synthesized. Foods rich in cholesterol are egg yolk, organ meats, shellfish, and dairy fats. Other animal fat products including butter, cream, whole milk, whole milk cheese, ice cream, and meat contain small amounts.