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Associated Press
In this Friday, Feb. 24, 2012 photo, doughnuts are fried in cooking oil in New York. Willpower apparently can be bought. The chance to win or lose $20 a month enticed people in a yearlong study to drop an average of nine pounds - four times more weight than others who were not offered dough to pass up the doughnuts. The new study, done at the Mayo Clinic, was released Thursday, March 7, 2013. (AP Photo/Mark Lennihan)

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