Triacylglycerols  which is also  known as  triglycerides or fats  consist  of  three  fatty  acid chains  esterified  to  a  glycerol  backbone.  Simple  triacylglycerols   have  three identical fatty acids esterified to the glycerol backbone, by mixed triacylglycerols  have  two  or  three  variant  fatty  acid  chains that is shown in figure.  Triacylglycerols constitute the major fuel store and the major dietary lipid in humans. Triacylglycerols are a widely concentrated energy store. The energy acquiesce from the whole oxidation of fatty acids is about 39 kJ g-1, contrast with an energy yield of 13 kJ g-1 of carbohydrate.