That's an increase of about 3 million from three years ago.
In new report released Tuesday, federal scientists calculated that more than 9 percent of Americans have diabetes — or 1 in 11 people. The report estimates that about a quarter of them haven't been diagnosed yet and don't know they have diabetes.
The Centers for Disease Control and Prevention used a 2012 national survey and other data to come up with the new numbers.
Diabetes is a disease in which sugar builds up in the blood. The most common form is tied to obesity, and the number of diabetics has ballooned with the rise in obesity.
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