Now that you know the basics of what vitamins are, let's talk about the Fat Soluble Vitamins (FSV's) specifically. There are only four FSV's: Vitamin A, Vitamin D, Vitamin E and Vitamin K. What makes them "fat soluble" is the fact that they dissolve in fats and oils but they won't dissolve in water. If you've ever seen a vitamin E capsule, you already know that inside the capsule is an oily substance containing vitamin E. The Fat soluble vitamins are present in many foods but they are especially high in foods like nuts and seeds that contain a high concentration of fats and oils. Though we will discuss each fat soluble vitamin separately, please keep in mind that in whole foods there are a variety of vitamins and minerals and other nutrients all working together. This is thought to be the reason that whole foods do such good things for the body whereas taking individual supplements doesn't usually benefit health and sometimes can be harmful. Many scientists and doctors (myself included) believe that it is the harmony of the nutrients coming in together that benefits our health and when we isolate an individual nutrient it cannot give the same benefits.