Obesity is at epidemic levels worldwide. In the U.S. alone, it is estimated that by 2018 the cost of treating weight-related illnesses will double to almost $350 billion a year. A 2010 report by the U.S. Surgeon General estimates that two-thirds of American adults and almost one in three children are now overweight or obese. Similar statistics emphasize the staggering problem in other industrialized countries. This volume originated in a special 2009...