As many as 41 million Americans have blood sugar levels that are high enough to constitute pre-diabetes and greatly increase their risk of developing the disease, according to new government figures. The figure is double the amount of previous estimates and reflects a change in the criteria for pre-diabetes that was made after it was determined that too many at-risk cases were being missed. Experts say the numbers underscore the severity of the diabetes epidemic the nation could face if preventive measures aren't taken.

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