Lactose raises blood sugar because after lactose is enzymed in the gastrointestinal tract, it is broken down into glucose, and glucose causes blood sugar to rise. Fructose and sucrose are relatively much less effective in raising blood sugar than lactose, so if you are a patient with diabetes, you should limit lactose intake because lactose intake will increase blood sugar elevation. Fruits that contain more lactose include longan, lychee, grapes and dates. In addition to limiting the intake of lactose, patients with diabetes should also pay attention to the intake of staple foods because too much staple food intake can also lead to an increase in blood sugar. So each meal rice to control within a bowl, or appropriate to increase coarse grains, coarse grains are not so well absorbed, can make the blood sugar rise is not so obvious, the fruit is mainly eat low glycemic index of fruit.