Do you eat because you're hungry? Do you eat because you're bored? Brian Wansink says what you put in your mouth every day is influenced by your environment, the company you keep, and an almost endless and invisible list of other factors. Today, Charity talks with Wansink, author of "Mindless Eating, Why We Eat More Than We Think." (Bantam Books) Wansink, an Iowa native, is Director of the Cornell University Food and Brand Lab .