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When is the best time to exercise, before or after a meal?

The American Diabetes Association recommends that people with diabetes perform at least 150 minutes per week of moderate-intensity aerobic physical activity.  Only you and your doctor can decide what kind of physical activity schedule is best for you, and you should not start a new exercise program until speaking to your doctor.  The best time to exercise depends on your schedule and lifestyle.  It may be beneficial to exercise 1 to 2 hours after a meal.  At that time, blood glucose levels will be high enough to provide energy, but digestion will be slowed.  If exercising before a meal, be sure to monitor for low blood glucose. 

Always test your blood glucose before exercising.  If your blood glucose is below 100mg/dL (5.5 mmol/L) you should eat about 15 grams of carbohydrate.  It is also a good idea to check your blood glucose about 45 minutes after exercising.  You should have a snack or other form of glucose with you when exercising in case your blood glucose drops too low.

You should also avoid exercise when your blood glucose is high (>300 mg/dL 16.67 mmol/L) in case of Type1 Diabetes, and above 400(22.2mmol/dl) in case of Type 2 Diabetes and pediatric. Patient should test ketons if his blood sugar level equal or above 250(13.89mmol/dl).  This is because exercise can cause your blood glucose to increase even more if you do not have enough insulin in your body.  It is suggested that you wait until your blood glucose is <250 mg/dL (13.89mmol/L) to start physical activity.