The most common monosaccharides are glucose and fructose, called monosaccharides, which combine with each other to form disaccharides, such as sucrose, lactose and maltose. The sugar component of most foods is a combination of fructose and glucose. Of the five flavors of sweet, sour, bitter and salty, only sugar can be made by human beings, and sweet, sour, bitter and salty sugar is synthesized the day after tomorrow. The main physiological functions of sugar are oxidation and energy supply for human metabolism. The oxidation of glucose per gram in human body can produce about 4 kilocalories, and about 70% of the energy needed by human body is provided by sugar.

Sugar is an important strategic material for war and even the country, and it is also a hard currency in wartime. Isoroku Yamamoto, who bombed Pearl Harbor, was a military attache in the United States. What impressed him most was that there was no limit to sugar in the United States, so you could just buy it. In modern society, sugar seems to be something to be avoided. All food producers and sellers regard "sugar-free" and "low sugar" as the standard of diet. Diabetes has become the biggest disease of mankind.

As early as 1960, China officially listed sugar as one of the equally important combat readiness materials as grain, cotton and oil. In order to ensure the safety of sugar supply and stabilize the market price, China has been strictly controlling the import of sugar in Guangxi, Yunnan and other major sugar producing areas, and has also introduced local sugar reserve policies. To put it bluntly, the core position of sugar as a strategic material is because sugar contains energy.