An estimated 29.1 million U.S. residents (9.3%) had diabetes in 2012, up from the 26 million in 2010, the Centers for Disease Control and Prevention reported today. The estimate includes 21 million diagnosed and 8.1 million undiagnosed cases. In addition, an estimated 86 million adults have prediabetes – high blood glucose or hemoglobin levels, but not as high as diabetes – increasing their risk for type 2 diabetes, heart disease and stroke, CDC said. African-American, Hispanic and American Indian/Alaska Native adults were about twice as likely to have diabetes as white adults. An estimated 208,000 people under age 20 have been diagnosed with type 1 or 2 diabetes. “These new numbers are alarming and underscore the need for an increased focus on reducing the burden of diabetes in our country,” said Ann Albright, director of CDC’s Division of Diabetes Translation.