When you have diabetes, besides the painful diet control and insulin injections, there is the daily blood glucose monitoring that makes your child fearful and parents distraught. Why do we need to monitor blood glucose? To maintain optimal blood glucose levels with minimal exogenous insulin, of course. Different foods have different effects on blood glucose, and different amounts of exercise have different effects on blood glucose. Monitoring blood glucose can help to understand the fluctuation of blood glucose during the day, and help to adjust diet, exercise and the amount of insulin to better avoid complications.