Diabetics can not eat icing sugar, diabetics need to limit the intake of carbohydrates. There are several kinds of icing sugar on the market at present, some are made directly from white granulated sugar, the composition is mainly sucrose, and some are processed into monocrystalline icing sugar, the composition of monocrystalline icing sugar is glucose. After sucrose enters the body, it can be broken down into glucose under the action of disaccharidase. The usual blood sugar check refers to the concentration of glucose in the blood. Glucose can be directly absorbed by the body after the intake of icing sugar, and sucrose can also be quickly decomposed into glucose and absorbed by the body, both of which can play a role in rapidly raising blood sugar. If you have been diagnosed as a diabetic patient, carbohydrate foods, such as rice, flour and other polysaccharides, should not exceed 300 g per day. sucrose, icing sugar, glucose and other easily absorbed carbohydrates need to be prohibited.