McDonald's

Researchers have long documented problems with McDonald's, but it wasn't until they began showing how the restaurants aimed at children and made people overweight that the American public paid attention.

• By Francie Diep

Doctors discover how to use McDonald's-style emoticon marketing to quadruple healthy food choices.

• By Gregory Ferenstein

A new study finds that eating fast food after a workout is just as good for you as a PowerBar.

• By Gregory Ferenstein