The term "blood sugar" refers to the amount of glucose present in blood. A normal sugar level remain less than 100 mg/dL after fasting (not eating approx 8 hours) and less than 140 mg/dL (after eating apporx 2 hours). Well it can be vary according to the health condition of individual. Its imperative to go for a blood glucose test frequently, so that it might be in control. For that, you can read weanswerit which shows the detail regarding the improvement of blood sugar control.