Purdue professor reviewed studies on whether diet soft drinks increases likelihood ... offering sugary sodas in their cafeterias and vending machines in an effort to improve the health of their ...

A new campaign from Diet Coke depicts a reimagined vending machine design — a "Slender Vendor" that measures about 7 inches in width. Some people think it's a clumsy statement on female body image.

But there was always diet soda in her life ... and its dependable presence in convenience-store refrigerators and vending machines make clear. But many drink it warily. Worriedly.