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Excerpts from "Pre-Diabetes." Read the entire page

How are Insulin Resistance, Pre-Diabetes, and Type 2 Diabetes Linked?

If you have insulin resistance, your muscle, fat, and liver cells do not use insulin properly. The pancreas tries to keep up with the demand for insulin by producing more. Eventually, the pancreas cannot keep up with the body's need for insulin, and excess glucose builds up in the bloodstream. Many people with insulin resistance have high levels of blood glucose and high levels of insulin circulating in their blood at the same time.

People with blood glucose levels that are higher than normal but not yet in the diabetic range have "pre-diabetes." Doctors sometimes call this condition impaired fasting glucose (IFG) or impaired glucose tolerance (IGT), depending on the test used to diagnose it. In a cross-section of U.S. adults aged 40 to 74 tested during the period 1988 to 1994, 33.8 percent had IFG, 15.4 percent had IGT, and 40.1 percent had pre-diabetes (IGT or IFG or both). Applying these percentages to the 2000 U.S. population, about 35 million adults aged 40 to 74 would have IFG, 16 million would have IGT, and 41 million would have pre-diabetes.

If you have pre-diabetes, you have a higher risk of developing type 2 diabetes, formerly called adult-onset diabetes or noninsulin-dependent diabetes. Studies have shown that most people with pre-diabetes go on to develop type 2 diabetes within 10 years, unless they lose 5 to 7 percent of their body weight—which is about 10 to 15 pounds for someone who weighs 200 pounds—by making modest changes in their diet and level of physical activity. People with pre-diabetes also have a higher risk of heart disease.

Type 2 diabetes is sometimes defined as the form of diabetes that develops when the body does not respond properly to insulin, as opposed to type 1 diabetes, in which the pancreas makes no insulin at all. At first, the pancreas keeps up with the added demand by producing more insulin. In time, however, it loses the ability to secrete enough insulin in response to meals.

Insulin resistance can also occur in people who have type 1 diabetes, especially if they are overweight.

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Did You Know?

... That pre-diabetes increases your risk of getting type 2 diabetes and of having heart disease or a stroke?

...That the diabetes drug metformin, a biguanide, reduced the risk of diabetes in those with pre-diabetes but was much less successful than losing weight and increasing activity? See our section on Exercise to learn how you can improve your health without medication.

...That pre-diabetes can be reversed without insulin or medication by losing a modest amount of weight and increasing your physical activity. This can prevent, or at least delay, onset of type 2 diabetes?

...That An international expert committee of the American Diabetes Association recently redefined the criteria for prediabetes, lowering the blood sugar level cut-off point for pre-diabetes. Approximately 20% more adults are now believed to have this condition and may develop diabetes within 10 years if they do not exercise or maintain a healthy weight.



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