4-MEI, a chemical created during the manufacturing of caramel color used to dye sodas brown, is under new scrutiny. iStockphoto hide caption

itoggle caption iStockphoto

Coca-Cola Life, a new product being rolled out in Argentina with a green label, is being marketed as a "natural" and therefore lower-calorie cola. Coca-Cola hide caption

itoggle caption Coca-Cola

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