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    Dana Vollmer battles gluten, wins gold

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Dana Vollmer battles gluten, wins gold

2012 U.S. Olympic swimmer Dana Vollmer says changing her diet is what has helped her make the team. Dr. Gupta reports.

Dana Vollmer battles gluten, wins gold

2012 U.S. Olympic swimmer Dana Vollmer says changing her diet is what has helped her make the team. Dr. Gupta reports.