Learn your blood glucose response to exercise. Everyone’s blood glucose response to exercise is different. Checking your blood glucose before and after exercise can show you the benefits of activity. You also can use the results of your blood glucose checks to prevent low blood glucose or high blood glucose.

If your blood glucose is high before you exercise (above 300), physical activity can make it go even higher, so be cautious about doing something active. For those with type 1 diabetes, if your fasting glucose level is above 250 and you have ketones in your urine, it’s best to avoid physical activity.

If low blood glucose is interfering with your exercise routine, eating a snack before you exercise or adjusting your medication may help. Talk to your health care team about what is right for you. During activity, check your blood glucose if you notice symptoms such as hunger, nervousness, shakiness, or sweating. If your blood glucose is 70 or below, have 2 to 5 glucose tablets, ½ cup (4 ounces) of fruit juice, or ½ cup of a regular soft drink to raise your blood glucose. After 15 minutes, check your blood glucose again. If it’s still below 70, have another serving and repeat these steps until your blood glucose is at least 70.

Plan to have water and snacks handy during activity. Drink plenty of water before, during, and after activity. If you are at risk for low blood glucose, always carry a source of carbohydrate to so you’ll be ready to treat low blood glucose.