A small amount of icing sugar is not harmful, eating too much icing sugar can lead to an increase in the incidence of metabolic diseases such as obesity and cause tooth decay. After entering the human body, rock candy will be converted into glucose. Properly eating rock candy can replenish physical energy. But if you eat too much icing sugar, the amount of glucose used by the body is less than the amount generated, which will lead to the conversion of glucose into fat, which will lead to an increase in the incidence of obesity and other diseases. And if you have high blood pressure, high blood cholesterol, diabetes, obesity, etc., it will aggravate the condition, and even cause other complications, jeopardizing human health. Sucrose in the icing sugar, in the mouth will be converted into acid, thus corroding human teeth. So eating too much rock candy can also cause tooth decay. Appropriate eating icing sugar has certain benefits, it is recommended that the usual dietary moderation, scientific collocation, reduce the intake of added sugar.