1. According to national regulations, the shelf life of ordinary edible white sugar is divided into 18 to 24 months according to different factors such as outer packaging (edible glucose is 12 months).

2. White sugar is refined sugar made from molasses squeezed from sugar cane and beets. White sugar is white in color, clean and has high sweetness. White sugar is easily contaminated with pathogenic microorganisms during the production, packaging, transportation, and storage processes. Especially white sugar that turns yellow after being stored for more than a year is often contaminated by mites. According to experiments, 15,000 mites were detected in 500 grams of white sugar. If people eat white sugar contaminated with mites, the mites will enter the digestive tract and parasitize, causing abdominal pain, diarrhea and other symptoms, and some may even cause allergic reactions.

3. White sugar is one of the main sources of nutrition for the human body. The human body's consumption must be maintained by the heat energy generated after the oxidation of sugar. About 70% of the energy required for human activities is supplied by sugar.