Why we eat (that much)

Given the vast scale (pardon the pun) of America's obesity epidemic, I find the kind of psychological analysis done by Professor Brian Wansink to be a fascinating insight into American culture - where we value food based on price per quantity and little else. He's a Cornell psychologists whose food lab tests to see what kind of social and physical cues people use to shape their eating habits. The discovery? That people frequently eat more than they think they did. The cause? Everything from larger dinnerware to the company at the table.