Take a look at the best and worst diets of 2013.
3 (tie). Weight Watchers Diet
Weight Watchers is a smart, effective diet. It surpassed other commercial diet plans in multiple areas, including short- and long-term weight loss and how easy it is to follow. Among its pluses: An emphasis on group support, lots of fruits and vegetables, and room for occasional indulgences.
Jessica Rinaldi / Reuters
Pete Souza/White House Photo
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