Type 1 Diabetes
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This topic covers type 1 diabetes, including information about symptoms, tests, and home treatment. For specific information about children who have type 1 diabetes, see the topic Type 1 Diabetes: Children Living With the Disease.
What is type 1 diabetes?
Type 1 diabetes happens when your pancreas stops making insulin.
Insulin is a hormone that helps the body’s cells use sugar (glucose) for energy. It also helps the body store extra energy in muscle, fat, and liver cells. Without insulin, this sugar can’t get into your cells to do its work. It stays in your blood instead. And then your blood sugar level gets too high.
High blood sugar can harm many parts of the body, such as the eyes, heart, blood vessels, nerves, and kidneys. It can also increase your risk for other health problems (complications).
Type 1 diabetes can occur at any age, but it usually starts in children or young adults. That’s why it used to be called juvenile diabetes.
Type 1 diabetes is different from type 2 diabetes. In type 1 diabetes, the body stops making insulin. In type 2, the body can’t use insulin the right way. Over time with type 2, the body doesn’t make enough insulin.
There isn’t a cure for type 1 diabetes. But with treatment, people can live long and healthy lives.
What causes type 1 diabetes?
The body makes insulin in beta cells, which are in a part of the pancreas called the islet (say “EYE-let”) tissue. Type 1 diabetes starts because the body destroys those beta cells. Experts don’t know why this happens.
Some people have a greater chance of getting type 1 diabetes because they have a parent, brother, or sister who has it. But most people with the illness don’t have a family history.
Other things that increase the risk of getting type 1 diabetes are being white and having islet cell antibodies in the blood.
What are the symptoms of undiagnosed type 1 diabetes?
Symptoms of diabetes are:
- Being very thirsty.
- Urinating a lot.
- Losing weight without trying.
- Being hungrier than usual (sometimes).
- Blurry eyesight.
These symptoms usually appear over a few days to weeks. Sometimes people notice symptoms after an illness, like the flu. They may think that the diabetes symptoms are because of the flu, so they don’t seek medical care soon enough.
If you wait too long to get medical care, you may get diabetic ketoacidosis, which is very dangerous. Symptoms of this problem include:
- Flushed, hot, dry skin.
- Not feeling hungry.
- Belly pain.
- A strong, fruity breath odor.
- Fast and shallow breathing.
- Restlessness, drowsiness, or trouble waking up.
How is type 1 diabetes diagnosed?
Your doctor can diagnose diabetes with a physical exam, your medical history, and blood tests.
Some people are diagnosed with type 1 diabetes because they have symptoms of diabetic ketoacidosis.
How is it treated?
Treatment for type 1 diabetes focuses on keeping blood sugar levels within a target range and doing things to reduce complications. To control your blood sugar, you:
- Take insulin.
- Eat a healthy diet that spreads carbohydrates throughout the day.
- Check blood sugar levels several times a day.
- Get regular exercise.
What are the complications from diabetes?
High blood sugar can lead to problems such as:
- Hardening of the arteries (atherosclerosis). This can cause heart disease, heart attack, or stroke.
- Diabetic retinopathy. This is a type of eye disease that can lead to vision loss.
- Diabetic nephropathy. This kidney disease has no early symptoms, but it can lead to kidney failure.
- Diabetic neuropathy. This is a nerve disease that can affect your internal organs as well as your ability to sense touch and pain, especially in your feet. It can also cause sexual problems.
Health Tools help you make wise health decisions or take action to improve your health.
- Diabetes: Checking Your Blood Sugar
- Diabetes: Coping With Your Feelings About Your Diet
- Diabetes: Counting Carbs if You Use Insulin
- Diabetes: Dealing With Low Blood Sugar From Insulin
- Diabetes: Giving Yourself an Insulin Shot
- Diabetes: Living With an Insulin Pump
- Diabetes: Preventing High Blood Sugar Emergencies
- Diabetes: Taking Care of Your Feet
- Diabetes: Using a Plate Format to Plan Meals
- Pregnancy and Diabetes: Planning for Pregnancy
Type 1 diabetes develops because the body’s immune system destroys beta cells in a part of the pancreas called the islet tissue. These beta cells produce insulin. So people with type 1 diabetes can’t make their own insulin.
The pancreas normally adjusts the amount of insulin it makes based on your changing blood sugar. When you have diabetes, your insulin injections can’t control your blood sugar moment to moment, the way your pancreas would. So you may have high and low blood sugar levels from time to time.
Causes of high blood sugar
Causes of high blood sugar include:
- Not getting enough insulin.
- Eating more food than usual.
- Stress and being ill (such as with severe flu) or having an infection, especially if you aren’t eating or drinking enough.
- Taking medicines that can raise blood sugar levels, such as those for sleep, some decongestants, and corticosteroids (such as prednisone).
- The dawn phenomenon or the Somogyi effect, which can cause early-morning high blood sugar.
- Adolescence, because of hormone changes and rapid growth.
Sometimes a person’s blood sugar level rises greatly before he or she knows something is wrong. Because insulin isn’t available, the cells in the body are unable to get the sugar (glucose) they need for energy. The body begins to break down fat and muscle for energy.
When fat is used for energy, ketones—or fatty acids—are produced and enter the bloodstream. This causes the chemical imbalance diabetic ketoacidosis. This can be a life-threatening condition.
Causes of low blood sugar
Causes of low blood sugar include:
- Taking too much insulin.
- Skipping or delaying a meal or snack.
- Exercising more than usual without eating enough food.
- Drinking too much alcohol, especially on an empty stomach.
- Taking medicines that can lower blood sugar, such as large amounts of aspirin and medicines for mental disorders.
- Starting your menstrual period, because hormonal changes may affect how well insulin works.
Symptoms of type 1 diabetes usually develop quickly, over a few days to weeks, and are caused by high blood sugar. At first, symptoms may be overlooked or mistaken for another illness, like the flu.
High blood sugar symptoms include:
- Urinating a lot, which may be more noticeable at night. The kidneys are trying to get rid of the excess sugar in the blood. To do that, they have to get rid of more water. More water means more urine.
- Being very thirsty. This happens if you urinate so often that you lose enough water to become dehydrated.
- Losing weight without trying. This happens because you are dehydrated. Weight loss may also happen if you are losing all of those sugar calories in your urine instead of using them.
- Increased hunger. You feel hungry because your body isn’t using all the calories that it can. Many of them leave your body in your urine instead.
- Blurry vision. When sugar builds up in the lens of your eye, it sucks extra water into your eye. This changes the shape of the lens and blurs your vision.
- Feeling very tired. You feel tired for the same reason you feel hungry. Your body isn’t using the calories you are eating, and your body isn’t getting the energy it needs.
See more about symptoms of high blood sugar.
Diabetic ketoacidosis symptoms
Symptoms of diabetic ketoacidosis are:
- Flushed, hot, dry skin.
- Loss of appetite, belly pain, and vomiting.
- A strong, fruity breath odor.
- Rapid, deep breathing.
- Restlessness, drowsiness, difficulty waking up, confusion, or coma. Young children may lack interest in their normal activities.
Low blood sugar
Common symptoms of low blood sugar include:
You can pass out when your blood sugar gets very low.
See more about symptoms of low blood sugar.
If you aren’t able to tell when your blood sugar is too low (hypoglycemic unawareness), it’s a good idea to test your blood sugar often.
Risk factors for high and low blood sugar
- Tight blood sugar control. Tight control of blood sugar helps prevent complications, such as eye, kidney, heart, blood vessel, and nerve disease. But it does put you at risk for frequent low blood sugar levels.
- Adolescence. The rapid growth spurts and changing hormone levels of adolescence can make it difficult to keep blood sugar levels within your target range. Your target range is the blood sugar goal you set with your doctor.
- Psychiatric conditions. Depression, anxiety disorder, panic disorder, and substance use disorder increase the risk of frequent high and low blood sugar levels.
- Eating disorders. Teens are often concerned about their weight and body image, and they may skip insulin injections to lose weight. Eating disorders can be much more common in girls and women of all ages who have type 1 diabetes.
- Lipohypertrophy, which is fat and scar tissue that can be caused by repeatedly injecting insulin in the same place. The area may feel firmer than the skin around it. Injecting insulin into an area of fat and scar tissue means it may not be absorbed at the same rate each time, which could cause high or low blood sugars.
- Gastroparesis. Damage to the nerves of the body can change how the stomach contracts when digesting food. Food can take longer to digest, which can make it harder to know when insulin will work after eating. This can lead to high and low blood sugars.
- Thyroid or kidney problems. Too little thyroid hormone can slow metabolism, which can cause some medicines (like insulin) to stay in the body longer. This can cause low blood sugar. And when the kidneys are damaged, insulin may stay in the body longer, causing low blood sugar. The kidneys may also have problems making glucose, causing low blood sugar.
It’s not possible for injected insulin to work as well as a normal pancreas, so you will have high and low blood sugar levels from time to time.
If your blood sugar stays above your target range for a long time, it can damage many parts of your body.
High blood sugar levels can lead to vision loss and blindness (diabetic retinopathy).
To learn more, see the topic Diabetic Retinopathy.
Feet and skin
You may have less feeling in your feet, which means that you can injure your feet and not know it. Common infections from blisters, ingrown toenails, small cuts, or other problems can quickly become more serious when you have diabetes.
If you get serious infections or bone and joint deformities, you may need surgery (even amputation) to treat those problems.
Heart and blood vessels
High blood sugar damages the lining of large blood vessels. This can lead to stroke, heart attack, or peripheral arterial disease.
High blood sugar levels can damage nerves throughout your body. This damage is called diabetic neuropathy. There are three kinds of diabetic neuropathy:
- Diabetic peripheral neuropathy. This is damage to the nerves that sense pain, touch, hot, and cold. This type of nerve damage can lead to deformities such as Charcot foot. It can also lead to other problems that may require amputation.
- Autonomic neuropathy. This is damage to nerves that control things like your heartbeat, blood pressure, sweating, digestion, urination, and sexual function.
- Focal neuropathy. Most of the time, this affects just one nerve, usually in the wrist, thigh, or foot. It may also affect the nerves of your back and chest and those that control your eye muscles.
To learn more, see the topic Diabetic Neuropathy.
The kidneys have many tiny blood vessels that filter waste from your blood. High blood sugar can destroy these blood vessels. You won’t have any symptoms of kidney damage until the problem is severe. Then you may notice swelling in your feet or legs or all over your body.
To learn more, see the topic Diabetic Nephropathy.
High blood sugar can damage the small blood vessels and nerves in the ear, causing hearing loss.
Gum disease can make it harder to keep blood sugar in a target range. And high blood sugar can cause gum disease, loss of teeth, and healing problems in the mouth.
The stress of dealing with diabetes or the effects that diabetes has on your body can lead to depression.
Being depressed can make it hard to eat healthy foods and to find the motivation to exercise. All of these things lead to higher blood sugar. By getting help for depression, you’ll feel better and may find it easier to stay motivated.
What Increases Your Risk
Risk factors are things that increase your chances of getting sick or having a problem. Risk factors for type 1 diabetes include:
- A family history of type 1 diabetes. Having a family history of the disease increases the chance that a person will have islet cell antibodies or other autoantibodies that attack the cells in the pancreas that produce insulin. But it doesn’t predict that a person will have the disease.
- Race. White people have a greater risk for type 1 diabetes than black, Asian, or Hispanic people.
- Presence of autoantibodies in the blood. People who have both a family history of type 1 diabetes and two or more autoantibodies in their blood are likely to get type 1 diabetes. Family members of people with type 1 diabetes can be tested to see if they have autoantibodies. People who are found to have autoantibodies may be able to take part in studies trying to prevent type 1 diabetes.
When should you call your doctor?
Call 911 or other emergency services right away if:
- You have symptoms of diabetic ketoacidosis (DKA), such as:
- Blurred vision.
- Trouble staying awake or trouble being woken up.
- Fast, deep breathing.
- Breath that smells fruity.
- Belly pain, not feeling hungry, and vomiting.
- Feeling confused.
- You passed out (lost consciousness), or if you suddenly become very sleepy or confused. (You may have very low blood sugar, called hypoglycemia.)
Call a doctor if:
- You are sick and cannot control your blood sugar.
- You have been vomiting or have had diarrhea for more than 6 hours.
- You have a blood sugar level that stays higher than the level the doctor has set for you, for example, 300 milligrams per deciliter (mg/dL) for two or more readings.
- You have blood sugar that stays lower than the level the doctor has set for you, for example, 70 mg/dL for two or more readings.
- You have symptoms of low blood sugar, such as:
- Feeling nervous, shaky, and weak.
- Extreme hunger and slight nausea.
- Dizziness and headache.
- Blurred vision.
Check with your doctor if:
- You often have problems with high or low blood sugar levels.
- You have trouble knowing when your blood sugar is low (hypoglycemia unawareness).
- You have questions or want to know more about diabetes.
Who to see
Health professionals who may be involved in your diabetes care include:
- A family doctor.
- An internist.
- A pediatrician.
- A certified diabetes educator (CDE).
- A registered dietitian. All people newly diagnosed with diabetes should see a dietitian for help in choosing healthy foods.
- An endocrinologist or pediatric endocrinologist.
If you have signs of complications of diabetes, such as nerve problems or kidney problems, you may be referred to a specialist. Learn more about the roles of the health professionals on a diabetes care team.
Planning pregnancy when you have type 1 diabetes
Women who want to plan a pregnancy need to talk to their doctors about making sure they have good control of their blood sugar.
High blood sugar levels during the first trimester of pregnancy raise the risk of birth defects. Good care of diabetes before conception appears to reduce the risk of birth defects.
Women with diabetes who don’t want to be become pregnant should use birth control. This reduces the risk of birth defects in unplanned pregnancies.
Exams and Tests
If your doctor thinks that you may have diabetes, he or she will order blood tests to measure how much sugar is in your blood. The tests used are:
Your doctor will use your blood test results and the American Diabetes Association (ADA) criteria to diagnose diabetes. He or she will also do a medical history and physical exam.
If it is hard to tell if you have type 2 or type 1 diabetes, your doctor may do a C-peptide test or test for autoantibodies. (Autoantibodies are produced when the body’s immune system does not work right.) These tests can help diagnose type 1 diabetes.
There are several types of autoantibodies, and some people may have them even before they show symptoms of type 1 diabetes. For people with a parent or sibling with type 1 diabetes, testing for autoantibodies and a higher-than-normal blood sugar level may be done to screen for an early stage of type 1 diabetes.
Some rare forms of diabetes (not type 1 or type 2 diabetes) are caused by a genetic problem and may need genetic testing to diagnose them.
Tests to check your health
You’ll need to see your doctor every 3 to 6 months. At your visits, your doctor may:
- Check your blood sugar levels since your last visit and review your target range.
- Check your blood pressure and start or adjust treatment, if needed. Nerve and blood vessel damage can result from high blood pressure, leading to heart problems and strokes. For more information, see the topic High Blood Pressure.
- Check your feet for signs of problems, especially if you have had diabetes for a few years. Nerve damage in your feet makes it hard to feel an injury or infection. Take off your socks each time you see the doctor to be sure you both remember to check your feet. At least once a year your doctor will do a complete examination of your feet.
- Have ahemoglobin A1ctest. This blood test shows how steady your blood sugar levels have been over time.
Review your progress regularly
Regular visits and checkups with your doctor are also a good time to:
- Review your meal plan.
- Review your physical activity.
- Review your mental health.
- Review your blood sugar records.
- Review your medicines.
These visits are also a good time to talk with your doctor about how you’re feeling. It’s normal to feel frustrated or overwhelmed with all there is to do. If you’re having trouble coping, your doctor can help. And if your health is changing and you have complications from diabetes, work with your doctor to make the right medical decisions for you. With your health and quality of life in mind, problem-solve and plan with your doctor.
Tests to screen for complications
After you have had type 1 diabetes for 3 to 5 years, your doctor may recommend these tests.
- A complete eye exam by an ophthalmologist or optometrist. High blood sugar levels from diabetes can damage your eyes. This test can find problems early. If you do not have any signs of diabetic retinopathy, your doctor may recommend less frequent exams. For example, you may have this test every 2 years.
- A foot exam to check for diabetic neuropathy. Your doctor may look at your feet for sores and calluses at every visit. If you have one or more foot problems, you may need to have your feet checked more than once a year. A child who has diabetes may not need a thorough examination of his or her feet each year until after puberty.
- A cholesterol and triglyceride test. Along with other measures, cholesterol levels can help you know your risk for having a heart attack or stroke.
- A urine test, to check for protein. If protein is found, you’ll have more tests to help guide the best treatment. Protein in the urine can be a sign of kidney damage (diabetic nephropathy).
- A blood test for creatinine and glomerular filtration rate (GFR). These tests check for kidney disease.
- A liver function test. This test looks for damage to the liver.
- A thyroid-stimulating hormone test. This test checks for thyroid problems, which are common among people who have diabetes. If the test is normal, your doctor may suggest you have the test again every 1 to 2 years.
See a list of tests to monitor diabetes to help you remember what to do and when.
- Dental exam. See your dentist twice a year for professional cleaning of your teeth and to look for gum disease. Seeing your dentist is one part of taking care of your teeth and gums when you have diabetes.
Eye exams during pregnancy
If you get pregnant, you will need to have an eye exam sometime during the first 3 months. You’ll also need close follow-up during your pregnancy and for 1 year after you have your baby. Pregnancy may increase your risk for diabetic retinopathy. If you already have eye disease and get pregnant, the disease can quickly get worse.
Type 1 diabetes requires treatment to keep blood sugar levels within a target range. Treatment includes:
- Taking several insulin injections every day or using an insulin pump.
- Monitoring blood sugar levels several times a day.
- Eating a healthy diet that spreads carbohydrates throughout the day.
- Regular physical activity or exercise. Exercise helps the body to use insulin more efficiently. It may also lower your risk for heart and blood vessel disease.
- Regular medical checkups. You will get routine screening tests and exams to watch for signs of complications, such as eye, kidney, heart, blood vessel, and nerve diseases.
- Not smoking.
- Not drinking alcohol if you are at risk for periods of low blood sugar.
Blood sugars are easier to predict and control when mealtimes, amounts of food, and exercise are similar every day. So getting into a daily routine helps a lot.
Some people find out that they have type 1 diabetes when they are admitted to a hospital for diabetic ketoacidosis. If their symptoms are severe, they may need to be treated in an intensive care unit.
Treatment for diabetic ketoacidosis includes fluids given through a vein (intravenous, or IV) to treat dehydration and to balance electrolytes, and insulin to lower the blood sugar level and stop the body from producing ketones.
The honeymoon period
If your blood sugar levels return to the normal range soon after diagnosis, you are in what is called the “honeymoon period.”
This is a time when the remaining insulin-producing cells in your pancreas are working harder to supply enough insulin for your body.
Treatment during this time may include:
- Keeping in close touch with your doctor.
- Testing your blood sugar level often, to see if it is rising.
- Taking very small amounts of insulin or no insulin. Even though you may not need insulin, some doctors prefer that you take small doses of insulin daily throughout the honeymoon period. This may decrease the stress on the pancreas.
Currently there is no way to prevent type 1 diabetes, but ongoing studies are exploring ways to prevent diabetes in those who are most likely to get it. People who have a parent, brother, or sister with type 1 diabetes and are willing to participate in one of these studies should talk with their doctors.
Preventing diabetes complications
People who have type 1 diabetes can help prevent or delay the development of complications by keeping their blood sugar in a target range. They also need regular medical checkups to detect early signs of complications. If complications are treated early, the damage may be stopped, slowed, or possibly reversed.
People who have other health problems along with diabetes, such as high blood pressure or high cholesterol, need to treat those conditions. Also, not smoking can reduce the risk of complications. Having other health problems can increase the risk for complications from diabetes.
You may need or want additional immunizations if certain situations raise your chance for exposure to disease.
Type 1 diabetes requires daily attention to diet, exercise, and insulin. You may have times when this job feels overwhelming, but getting into a daily routine can help. And taking good care of yourself will also help you feel better, have a better quality of life, and prevent or delay complications from diabetes.
Spread carbohydrates throughout the day
Carbohydrate is the one nutrient in your diet that most affects blood sugar levels. A registered dietitian can help you learn about what foods contain carbohydrates and how to manage them in your diet.
You need to take injections every day, because your pancreas no longer produces insulin. To learn more, see Medications.
Check your blood sugar often
Your doctor will want you to test your blood sugar level several times a day.
It’s also important to know how to recognize and treat high or low blood sugar quickly.
Exercise safely. Drink plenty of water before, during, and after you are active. This is very important when it’s hot out and when you do intense exercise. You can also try keeping track of your exercise on an activity log( What is a PDF document? ).
If your doctor says it’s okay, then try to do muscle-strengthening exercises at least 2 times a week. These exercises include push-ups and weight training. You can also use rubber tubing or stretch bands. You stretch or pull the tubing or band to build muscle strength. Be sure to work the major muscle groups: legs, hips, back, abdomen, chest, shoulders, and arms.
Protect your feet
Daily foot care can prevent serious problems. Foot problems caused by diabetes are the most common cause of amputations.
In addition to exercising, it is a good idea to limit the amount of alcohol you drink. The American Diabetes Association recommends that women with diabetes have no more than 1 drink a day and men with diabetes have no more than 2 drinks a day.footnote 1
One drink is 12 fl oz (0.4 L) of beer, 5 fl oz (0.2 L) of wine, or 1.5 fl oz (44.4 mL) liquor.
Do not smoke
Having type 1 diabetes can cause a lot of problems in your body. Smoking can make many of these problems worse, especially heart and blood vessel disease.
Smoking raises your cholesterol and makes it harder for your body to heal.
No matter how long you’ve smoked, your health will improve after you quit.
Insulin helps keep your blood sugar level tightly controlled and within a target range. It can be taken by an injection, or through an insulin pump. Rapid-acting insulin is also available as a powder that you inhale.
Usually people who have type 1 diabetes take a combination of types of insulin, such as a long-acting insulin once or twice a day and a rapid-acting insulin before each meal. The amount and type of insulin needed varies for each person.
The amount and type of insulin you need changes over time, depending on age, hormones (such as during rapid growth or pregnancy), and changes in exercise routine. You may need higher doses of insulin during times of illness or emotional stress.
Learn about insulin:
- Know the dose of each type of insulin you take, when you take the doses, how long it takes for each type of insulin to start working (onset), when it will have its greatest effect (peak), and how long it will work (duration).
- Never skip a dose of insulin without the advice of your doctor.
You may also take an amylinomimetic, such as pramlintide (Symlin). This medicine is only used with insulin, but it’s given in a separate shot.
ACE and ARB
If small amounts of protein are found when your urine is tested, you may be in the early stage of diabetic nephropathy. You may be given an angiotensin-converting enzyme (ACE) inhibitor or an angiotensin II receptor blocker (ARB).
If you have talked about it with your doctor, take a low-dose aspirin every day. Aspirin can help certain people lower their risk of a heart attack or stroke. But taking aspirin isn’t right for everyone, because it can cause serious bleeding. Do not start taking daily aspirin unless your doctor knows about it.
Medicines for other health problems
You may need one or more medicines to lower blood pressure.
You also may need to take medicine to lower your cholesterol.
Treating high blood pressure and high cholesterol may help prevent complications from diabetes.
You may need other medicines if you develop complications, such as kidney disease.
Some complications from type 1 diabetes are treated with surgery. For example, surgery to remove the vitreous gel (vitrectomy) may improve eye disease.
When insulin isn’t enough to keep blood sugar in your target range, a pancreas transplant might be an option. If it’s successful, you may no longer have symptoms or need to treat diabetes.
But you may still get complications from diabetes. If you already have complications, they may continue to get worse as time goes on.
The success rate for pancreas transplants is improving because of new surgical techniques and new medicines.
If you get a transplanted pancreas, you must take medicine to keep your body from rejecting the new organ.
A pancreas transplant can be done at the same time as a kidney transplant.
Pancreatic islet cell surgery
Research continues on pancreatic islet cell surgery. It involves inserting a small group of donated pancreas cells (islet cells) through a vein in your liver. After surgery, these cells begin making insulin. If they can make enough, you may no longer need insulin injections.
Because the surgery is simpler than a pancreas transplant, there are usually fewer complications. But you must still take medicine to prevent rejection.
Avoid products that promise a “cure” for diabetes. For example, antioxidant supplements (vitamins E, C, and carotene) don’t cure diabetes. The American Diabetes Association doesn’t recommend taking them.footnote 1
If you hear about something new to help diabetes, do some research to find out if it really works. You can also check with your doctor or a diabetes educator. Your health plan may also provide health information on its website.
Some complementary therapies may help relieve stress and muscle tension. They might help you feel better in general. But they shouldn’t be used instead of treatment.
Talk with your doctor if you are using:
- American Diabetes Association (2019). Standards of medical care in diabetes—2019. Diabetes Care, 42(Suppl 1): S1–S193. Accessed December 17, 2018.
- U.S. Department of Health and Human Services (2008). 2008 Physical Activity Guidelines for Americans (ODPHP Publication No. U0036). Washington, DC: U.S. Government Printing Office. Available online: http://www.health.gov/paguidelines/guidelines/default.aspx.
Current as of: April 16, 2019