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About Prediabetes & Type 2 Diabetes

Over 84 million Americans now have prediabetes – that’s 1 out of 3 adults! Of those 84 million, 9 out of 10 of them don’t even know they have it.

People with prediabetes are at high risk for type 2 diabetes, heart disease, and stroke.

With so much at stake, it’s important to learn about prediabetes and take action.

Read the National Diabetes Statistics Report to learn more about the toll that diabetes is taking in the United States.

Diabetes Is Serious and Common

Diabetes is currently the seventh leading cause of death in the United States—and studies show that deaths related to diabetes may be under-reported! Today, 1 in 10 U.S. adults has diabetes, and if trends continue, 1 in 5 will have it by 2025.

An additional 84.1 million U.S. adults – 1 in 3 – have prediabetes, which means their blood sugar is higher than normal, but not high enough to be considered type 2 diabetes. Without intervention, many people with prediabetes could develop type 2 diabetes within 5 years, which puts them at risk of serious health problems, including:

  • Heart attack
  • Stroke
  • Blindness
  • Kidney failure
  • Loss of toes, feet, or legs

Learn more:
National Diabetes Statistics Report

Diabetes Is Costly

NDPP Costs Graphic

Medical expenses for people diagnosed with diabetes are more than twice as high as for those without diabetes.

Type 2 diabetes affects millions of individuals and their families, workplaces, and the U.S. health care system. In 2017, the total cost of care for people with diagnosed diabetes was $327 billion, up 33% over a 5-year period. About 1 in 4 health care dollars is spent on people with diagnosed diabetes. The majority of expenses are related to hospitalizations and medications used to treat complications of diabetes.

People diagnosed with diabetes incur on average $16,750 annually in medical expenses. That’s about 2.3 times the medical expenses of a person without diabetes. The need to prevent type 2 diabetes has never been greater.

To help employers, insurers, and state health departments weigh the costs and benefits of offering National DPP lifestyle change programs, CDC has developed the Diabetes Prevention Impact Toolkit. Check it out!


What Are Prediabetes and Diabetes?

Having prediabetes means your blood glucose (sugar) levels are higher than normal—but not high enough to be diagnosed as diabetes. Prediabetes can lead to heart disease, stroke, and type 2 diabetes, the most common form of diabetes. Prediabetes can often be reversed.

With type 2 diabetes, your body cannot properly use insulin (a hormone that helps glucose get into the cells of the body). You can get type 2 diabetes at any age, but you are at higher risk if you are older, overweight, have a family history of diabetes, are not physically active, or are a woman who had gestational diabetes.

Gestational diabetes is a kind of diabetes that some women get when they are pregnant. Even if a woman’s blood sugar levels go down after her baby is born, she is at higher risk of getting type 2 diabetes later in life.

With type 1 diabetes, your body cannot make insulin, so you need to take insulin every day. Type 1 diabetes is less common than type 2 diabetes; about 5% of the people who have diabetes have type 1. Currently, no one knows how to prevent type 1 diabetes.

Check out our Infographics.

To learn more about the basics of diabetes and prediabetes, visit CDC’s Diabetes website.


Who Is at Risk for Prediabetes and Type 2 Diabetes?

If you have these risk factors, you may be at higher risk than others for prediabetes and type 2 diabetes.

  • You are overweight.
  • You are 45 years of age or older.
  • Your parent or sibling has type 2 diabetes.
  • You are physically active fewer than 3 times per week.
  • You ever gave birth to a baby that weighed more than 9 pounds.
  • You ever had diabetes while pregnant (gestational diabetes).

Race and ethnicity also affect your risk. African Americans, Hispanic/Latino Americans, American Indians, Pacific Islanders, and some Asian Americans are at particularly high risk for type 2 diabetes.

Find out if you are at risk for prediabetes and type 2 diabetes. Take our online quiz or print off a prediabetes screening test [PDF-757KB].

If you are at risk, talk to a health care professional about getting a blood sugar test.


Diabetes Affects Some Groups of People More than Others

Large crowd of people posing in a studio

A number of factors increase a person’s risk for prediabetes and type 2 diabetes, including being overweight, not being physically active, and having a family history of diabetes.

A person’s race or ethnicity also can increase their risk for diabetes. Following are the percentages of people in the United States with diagnosed diabetes from 2013 to 2015 among people aged 18 or older, by race and ethnicity:

  • American Indian/Alaska Natives – 15.1%
  • Non-Hispanic blacks – 12.7%
  • Hispanics – 12.1%
  • Asian Americans – 8.0%
  • Non-Hispanic whites – 7.4%


Why Should You Do Something About Prediabetes?

A man holding a basket of vegetables

Taking action now, by eating healthier and getting more physical activity, can help prevent prediabetes from becoming type 2 diabetes and reduce the risk of heart attack and stroke.

Don’t let the “pre” in prediabetes fool you into thinking it’s not really a problem now. You can take action right away to help prevent prediabetes from becoming type 2 diabetes. You can also reduce the risk of heart attack and stroke associated with prediabetes.

Many people with prediabetes who do not change their lifestyle—by losing weight (if needed) and being more physically active—will develop type 2 diabetes within 5 years. Type 2 diabetes can lead to serious health issues such as:

  • Heart attack
  • Stroke
  • Blindness
  • Kidney failure
  • Loss of toes, feet, or legs

In addition, some of the risk factors for prediabetes and type 2 diabetes—like being overweight and not being physically active—can make you feel sluggish and affect your mood. Positive lifestyle changes not only lower your risk of prediabetes and type 2 diabetes, they can improve your overall well-being and the well-being of your family.


You Can Prevent Type 2 Diabetes—How Can You Get Started?

If you have prediabetes, join a CDC-recognized lifestyle change program. It can help you lose weight, become more active, and prevent or delay type 2 diabetes. To learn more about diabetes prevention, visit Research-Based Prevention Program.

Ready to make a change? Go to Find a Program to get started today!

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Albright A, Gregg EW. Preventing type 2 diabetes in communities across the US: the National Diabetes Prevention Program. Am J Prev Med 2013;44(4):S346-S351. Available from

Boyle JP, Thompson TJ, Gregg EW, Barker LE, Williamson DF. (2010). Projection of the year 2050 burden of diabetes in the US adult population: dynamic modeling of incidence, mortality, and prediabetes prevalence. Population Health Metrics. Available from

Centers for Disease Control and Prevention. National Diabetes Statistics Report, 2017: Estimates of Diabetes and Its Burden in the United States. Atlanta, GA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, 2017. Available from

Knowler WC, Barrett-Conner E, Fowler SE, et al.; Diabetes Prevention Program Research Group. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med 2002;346:393–403. Available from

American Diabetes Association. Economic Costs of Diabetes in the U.S. in 2017. Diabetes Care 2018;41(5):917-928. Available from