Are you a fat burner or a sugar burner? The answer to this question has a profound effect on how long you will live, and on how healthy you will be. Our body can burn two types of fuel for energy: fat and sugar. Fat is our most efficient energy source, and under healthy conditions we get most of our energy from fat. Sugar, on the other hand, is the body’s turbo charger: the fuel that we use when we need a sudden burst of energy. Your body is not designed to burn sugar as its primary fuel.