Overview
Type 2 diabetes (T2D) is a chronic condition that happens when you have persistently high blood sugar levels (hyperglycemia).
Healthy blood sugar (glucose) levels are 70 to 99 milligrams per deciliter (mg/dL). If you have undiagnosed Type 2 diabetes, your levels are typically 126 mg/dL or higher.
T2D happens because your pancreas doesn’t make enough insulin (a hormone), your body doesn’t use insulin properly, or both. This is different from Type 1 diabetes, which happens when an autoimmune attack on your pancreas results in a total lack of insulin production.
How common is Type 2 diabetes?
Type 2 diabetes is very common. More than 37 million people in the U.S. have diabetes (about 1 in 10 people), and about 90% to 95% of them have T2D.
Researchers estimate that T2D affects about 6.3% of the world’s population. T2D most commonly affects adults over 45, but people younger than 45 can have it as well, including children.
Symptoms
When to see a doctor
Complications
- High blood pressure.
- Diabetes.
- Heart failure.
- Some types of heart valve disease.
Prevention
- Control high blood pressure, high cholesterol and diabetes.
- Don't smoke or use tobacco.
- Eat a diet that's low in salt and saturated fat.
- Exercise at least 30 minutes a day on most days of the week unless your health care team says not to.
- Get good sleep. Adults should aim for 7 to 9 hours daily.
- Maintain a healthy weight.
- Reduce and manage stress.
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