White sugar cannot be eaten after its expiration date because it can be contaminated by a mite called "sweet-eating mite".

White sugar is a type of table sugar. Its particles are crystalline, uniform, white color, pure sweetness, sweetness is slightly lower than brown sugar. It is commonly used in cooking.GB 13104-2014 defines white sugar as cane or beet as raw material, processed by the extraction of sugar juice, clean processing, cooking and refining crystallization and honey separation and other processes made of crystalline sucrose.

Mian white sugar is in powder form, suitable for cooking purposes, with a sweetness similar to that of white sugar. There are two kinds of sugar, refined white sugar and white sugar of the local law. The former white color, crystal grain fine soft, good quality; the latter color yellowish slightly dark, poor quality.

Consumption:

Sugar is a nutrient, but should be controlled within a certain amount. In the end a person a day to eat how much white sugar is appropriate, the more consistent opinion abroad is: daily per kilogram of body weight control in about 0.5 grams.

That is to say, children weighing 20 kilograms of daily no more than 10 grams, weighing 60 kilograms of adults, about 30 grams per day. Therefore, it is usually necessary to keep track of the amount of sugar in the food so as not to overindulge.