Michelle Obama eats lunch with school children at Parklawn Elementary School in Alexandria, Va., in 2012. The first lady unveiled new guidelines Tuesday aimed at cracking down on the marketing of junk food to kids during the school day. Saul Loeb/AFP/Getty Images hide caption

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First Lady Michelle Obama at the White House on May 9. John Stillwell / pool/Getty Images hide caption

itoggle caption John Stillwell / pool/Getty Images