Preserved in a cool and dry environment, brown sugar generally has a shelf life of 18 months. Brown sugar is crude sugar made from sugar cane as raw material, after juice extraction, clarification, boiling and refining. More than 95% of brown sugar is sucrose and contains nutrients such as riboflavin, carotene, niacin, and other trace elements such as iron, manganese and zinc. If brown sugar is properly preserved and placed in a cool, dry environment, the shelf life is generally 18 months. If during this period of time brown sugar has undergone changes such as moisture, the shelf life will be shortened accordingly, if you find that the properties of brown sugar has changed, you should try to avoid eating. Brown sugar can be digested into glucose, can quickly release energy, moderate drinking brown sugar can quickly replenish physical strength. However, you should not consume large amounts of brown sugar on a daily basis. Especially diabetic patients need to strictly control the intake of brown sugar, and try to avoid eating. It is recommended that daily purchase of brown sugar should choose a small package, and properly stored, not to be consumed after the expiration date.