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Weight loss is a popular subject for New Year resolutions and television commercials, but remains an elusive goal for millions of people. In fact, Americans are now larger than ever. Nova takes a look in the mirror for an unclouded vision of obesity in Nova: Fat Chance in a Thin World. By discrediting rumors and smashing stereotypes, the PBS program proves that fat is as fat does. Metabolism, genes, and society all play roles in weight gain. Before, an unsuccessful diet was blamed on a lack of will power or character. Now, scientists explain why the body rebels against weight reduction in this revolutionary exploration of body size.