Pedometer, an app, keeps track of your steps, distance traveled and calories burned. Benjamin Morris/NPR hide caption

itoggle caption Benjamin Morris/NPR

Karlton Hill, 15, was diagnosed with diabetes when he was 12. He works hard to manage the disease: He jogs and does pushups every day; he takes metformin is very careful about what he eats. Leslie Capo/LSU Health Sciences Center hide caption

itoggle caption Leslie Capo/LSU Health Sciences Center

Researchers say that if the price of soda gets higher, people will drink less of it, which will lead to fewer deaths. Joel Saget/AFP/Getty Images hide caption

itoggle caption Joel Saget/AFP/Getty Images