Goodbye, Sodas. McDonald's says it will now market and promote Happy Meals only with milk, water or juice. Bill Parrish Photography/PR Newswire/AP hide caption

itoggle caption Bill Parrish Photography/PR Newswire/AP

Appalachia has a distinct culture of sipping soda constantly throughout the day. "Here in West Virginia, you see people carrying around bottles of Mountain Dew all the time — even at a public health conference," says public health researcher Dana Singer. Jin Lee/Bloomberg via Getty Images hide caption

itoggle caption Jin Lee/Bloomberg via Getty Images

A dental researcher says he's concerned that excessive soda consumption is leading to severe erosion of teeth. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Share a Coke with ... (enter name here). Darren Foreman (left), Elliott Brown (middle), teigan (top right), ☼zlady (bottom left) via Flickr hide caption

itoggle caption Darren Foreman (left), Elliott Brown (middle), teigan (top right), ☼zlady (bottom left) via Flickr

Harry Patel, an employee of Blondie's Deli and Grocery, talks on the phone while waiting for customers in New York on Monday. A new anti-smoking proposal would make New York the first city in the nation to keep tobacco products out of sight in retail stores. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP

PepsiCo's product line ranges from salty chips and its sugary namesake drink to more healthful fare like hummus and yogurt. In 2010, the company announced plans to cut sugar, fat and sodium in its products to address health and nutrition concerns. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

When they eat out at a restaurant, kids consume more calories than they do at home. Here, members of the Long Island Gulls hockey team enjoy a lunch at TGI Friday's back in 2007 in Marlborough, Mass. Bruce Bennett/Getty Images hide caption

itoggle caption Bruce Bennett/Getty Images