Usually, there is a difference in blood sugar between exercising and not exercising after a meal, both for normal people and diabetics, but there is no fixed value for the exact difference. With regard to the rise of blood sugar after meals, moderate exercise at this time helps the muscles to take in glucose in order to lower blood sugar and keep it within the normal range. However, if you are a diabetic patient, you should not exercise too much, so that your body will not be in a state of stress and the secretion of glucagon will increase, which will offset the effect of blood glucose decrease due to exercise, and in serious cases, your blood glucose will even exceed the normal range. In addition, it is suggested that patients should adhere to post-prandial exercise for a long time, which is beneficial to control blood sugar and keep it in a more normal and reasonable range. Exercise can take some aerobic exercise, common such as walking, yoga, square dance, etc., and adhere to about 30 minutes a day can be. In addition, if you are a diabetic, you can monitor your blood sugar after each exercise to adjust your exercise program according to the magnitude of its change.