Nutrisystem to Medifast Seek New Year’s Resolution Wins

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Let the 2014 diet wars begin.

For this year’s weight-loss season, Nutrisystem Inc. is trying to capture resolution-making Americans with a plan that uses an algorithm to calculate the calories an individual needs and then sends them food from a menu personalized to their tastes. Weight Watchers International Inc. has a new two-week jumpstart plan with a mobile application, while Medifast Inc. is adding store locations through franchising.