Definitions for "Fat-soluble vitamins"
any vitamins that are soluble in fats or fat solvents. These vitamins are absorbed by the body from the intestinal tract and follow the same path of absorption as fat and any condition interfering with the absorption of fats would result in poor absorption of these vitamins as well.
Vitamins which dissolve in fats rather than water. They can be stored in the body for longer than water soluble vitamins (A,D,E & K are fat soluble).
Vitamins A, D, E, and K only dissolve in fat tissues and the liver, and thus stay in the body longer than water-soluble vitamins.