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DOWNLOAD: Study says Americans gain one pound over holidays

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All those cookies, treats and holiday parties all up.

On average, Americans gain one pound during the holiday season, between Thanksgiving and New Year’s.

The study said people who sit around more often will pack on an additional half a pound. But being active doesn’t give you a free pass to eat whatever you want.

“You can’t out-exercise a really bad diet,” said Heather Mangieri, a spokeswoman for the Academy of Nutrition and Dietetics.