Diabetes Health Center

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Understanding Diabetes - the Basics

Diabetes, the most common disorder of the endocrine (hormone) system, occurs when blood sugar levels in the body consistently stay above normal. It affects more than 21 million people in the U.S. alone.

Diabetes is a disease brought on by either the body's inability to make insulin ( type 1 diabetes) or by the body not responding to the effects of insulin ( type 2 diabetes). It can also be brought on by pregnancy. Insulin is one of the main hormones that regulates blood sugar levels and allows the body to use sugar (called glucose) for energy. Talk with your doctor about the different types of diabetes and your risk for this disease.

Pre-Diabetes

In the United States, 54 million people over age 20 have blood sugar levels that are higher than normal but not high enough to be classified as diabetes. This is known as pre-diabetes, or impaired glucose tolerance. While people with pre-diabetes usually have no symptoms, it’s almost always present before a person develops type 2 diabetes. However, complications normally associated with diabetes, such as heart disease, can begin to develop even when a person has only pre-diabetes.

Once type 2 diabetes develops, symptoms include unusual thirst, a frequent need to urinate, blurred vision, or extreme fatigue. Talk to your doctor to see if you need to be tested for pre-diabetes. By identifying the signs of pre-diabetes before diabetes occurs, you can prevent type 2 diabetes all together and lower your risk of complications associated with this condition such as heart disease.

For more detail, see WebMD's article Prediabetes.

Type 1 Diabetes

Type 1 diabetes occurs because the insulin-producing cells of the pancreas (called beta cells) are destroyed by the immune system. People with type 1 diabetes produce no insulin and must use insulin injections to control their blood sugar.

insulin

Type 1 diabetes most commonly starts in people under the age of 20, but may occur at any age.

For more detail, see WebMD's article Type 1 Diabetes.

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WebMD Medical Reference

webMD Video

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