The higher the GI value of a food, the faster it can raise blood sugar, of which the GI value of banana is about 52. Foods can be categorized into low, medium and high glycemic index foods according to their glycemic capacity, among which low glycemic index foods can stay in the gastrointestinal tract for a longer period of time, with slow absorption and lower postprandial blood glucose, and their GI value is less than 55, so banana is a low glycemic index food. The glycemic rate of food is accelerated with the increase of GI value, but it is also related to its quantity as well as the combination of types, etc. Generally, a varied diet will slow down the rate of glycemic increase under the control of the total amount of food. For more information about healthy diabetic diet, please consult a professional nutritionist.