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Diabetes and exercise

Exercise - diabetes; Exercise - type 1 diabetes; Exercise - type 2 diabetes


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Exercise is an important part of managing your diabetes. If you are obese or overweight, exercise can help you manage your weight.

Exercise will Help Your Diabetes

Exercise can help lower your blood sugar without medicines. It reduces your risk of heart disease. Exercise can also lessen the symptoms of depression and reduce stress.

But be patient. It may take several months of regular exercising before you see changes in your health.

Getting Started

Start with walking. If you are out of shape, start by walking for 5 to 10 minutes a day.

Try to set a goal of fast walking. You should do this for 30 to 45 minutes, at least 5 days a week. In order to lose weight, the amount of exercise may need to be greater. So do more if you can. Swimming or exercise classes are also good.

Wear a bracelet or necklace that says you have diabetes. Tell coaches and exercise partners that you have diabetes. Always have fast-acting sources of sugar with you, such as juice or hard candy. Carry a cell phone with emergency phone numbers with you, as well.

Drink plenty of water. Do this before, during, and after exercising. Try to exercise at the same time of day, for the same amount of time, and at the same level. This will make your blood sugar easier to control. If your schedule is less regular, exercising at different times of the day is still better than not exercising at all.

Try to avoid sitting for more than 30 minutes at a time. Get up and stretch. Walk or do some quick exercises like lunges, squats, or wall push-ups.

Talk to Your Doctor First

Your health care provider should make sure your exercise program is safe for you. It is for most people with diabetes. Your provider may ask about symptoms, such as shortness of breath, chest pain, or leg pain that you may get when you walk upstairs or up a hill. In rare cases, your provider will order tests to make sure that you can exercise safely without damaging your heart.

If you take medicines that lower your blood sugar, exercise can make your blood sugar go too low. Talk to your provider or nurse about how to take your medicines when you exercise or how to adjust the doses to prevent low blood sugars.

Some types of vigorous exercise can make your eyes worse if you already have diabetic eye disease. Get an eye exam before starting a new exercise program.

After you start your exercise program, call your provider if you have any of the following:

  • Feel faint, have chest pain, or feel short of breath when you exercise
  • Feel pain or numbness in your feet. Also call if you have sores or blisters on your feet
  • Your blood sugar gets too low or too high during or after exercising

Your Blood Sugar and Exercise

Check your blood sugar before you exercise. Also, check it during exercise if you are working out for more than 45 minutes.

Check your blood sugar again right after exercise, and later on. Exercise can cause your blood sugar to drop for up to 12 hours after you are done.

If you use insulin, ask your provider when and what you should eat before you exercise. Also, find out how to adjust your dose when you exercise.

DO NOT inject insulin in a part of your body that you are exercising, such as the shoulders or thighs.

Keep a snack nearby that can raise your blood sugar quickly. Examples are:

  • Five or six small hard candies
  • One tablespoon (tbsp), or 15 grams, of sugar, plain or dissolved in water
  • One tbsp, or 15 milliliters (mL) of honey or syrup
  • Three or four glucose tablets
  • One half of a 12-ounce can (177 mL) of regular, non-diet soda¬†or sports drink
  • One half cup (4 ounces or 125 mL) of fruit juice

Have a larger snack if you will be exercising more than usual. You can also have more frequent snacks. You may need to adjust your medicine if you are planning unusual exercise.

If exercise frequently causes your blood sugar to be low, talk with your provider. You may need to lower the dose of your medicine.

Your Feet and Exercise

Always check your feet and shoes for any problems before and after exercise. You might not feel pain in your feet because of your diabetes. You may not notice a sore or blister on your foot. Call your provider if you notice any changes on your feet. Small problems can become serious if they go untreated.

Wear socks that keep moisture away from your feet. Also, wear comfortable, well-fitting shoes.

Review Date: 5/17/2018
Reviewed By: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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