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Steve Cahillane, president and CEO of Coca-Cola Refreshments, Inc., speaks during an interview with the Associated Press Thursday, June 7, 2012, while attending the Clinton Global Initiative America gathering in Chicago. Cahillane said that New York Mayor Michael Bloomberg's proposal to ban the sale of large sodas and other sugary drinks unfairly singles out an industry. He says the measure is overly simplistic and would do nothing to address the complex problems of obesity and other health issues. (AP Photo/M. Spencer Green)

Obesity: A Big Fat Problem For America’s Future

The National Institute of Health defines obesity as having too much body fat. It's been described as the fastest growing public health challenge for the U.S. As the prevalence of obesity has increased, so have related health care costs.