Retailers are enjoying a life behind bars. Food bars, that is. There's good reason: The category, already earning $3 billion, is expected to more than double by 2007, according to Packaged Facts, the New York-based food and lifestyle tracking firm. The popularity of food bars -- which are classified as everything from cereal and nutrition to diet and athletic -- is a direct result of their promise of variety, portability and nutrition, retailers told SN. "The category is for people who ...

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