Fructose is one of the most common hexose sugars. It is found in honey and fruits, and combines with glucose to form sucrose for everyday consumption. Fructose contains 6 carbon atoms and is also a monosaccharide, an isomer of glucose. Fructose is found in large quantities in the free state in the pulp of fruits and honey. Naturally occurring fructose is in the form of free D-fructose, which exists in the form of a viscous liquid that looks like oil under natural conditions, but not in the form of crystals. Compared to its sugar counterpart, fructose's sweetness in the mouth comes and goes quickly. The sweetness peak of fructose occurs earlier than the flavor of the food. When the peak of the flavor of the food, the sweetness of fructose has subsided, so as not to obscure the flavor of the food, with a variety of different flavors can coexist harmoniously, and therefore will not be added to the fructose and cover and confuse the original flavor of the fruit.