A traveler passes an automated external defibrillator at O'Hare International Airport in Chicago. Tim Boyle/Getty Images hide caption

itoggle caption Tim Boyle/Getty Images

Antonio Garcia re-stocks the beverages at The Corner Market in Washington, D.C., in 2010. Study author Jean Welsh says that sweetened beverages tend to be the biggest source of added sugar. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP