Well, because glycogen, which consists of glucose monomers, contains many hydroxyl groups and those hydroxyl groups are polar and so they attract water. And so what that means is glycogen is not a very concentrated form of energy storage like triglycerides are. So we see that the fact that triglycerides are highly reduced and anhydrous dismiss triglycerides, highly compact and highly concentrated stores of metabolic cell energy. So the complete oxidation of fatty acids yields about 38 kilojoules of gram that we oxidize. And if we compare that to oxidizing, carbohydrates or proteins, this only yields about 17 kilojoules per gram that we actually oxidized. So we're able to actually store much more energy in these fatty acids.