As a child, were you encouraged to clean your plate and then go back for seconds? If so, you probably didn't grow up in France, where children are taught to savor the feeling of longing, or envie, for their next course (just think of the cheese!). Our differing notions of satisfaction were examined in a 2006 study of 133 Parisians and 145 Chicagoans published in the journal Obesity. While the French paid attention to an internal cue, the feeling of fullness, the Windy City-ers relied on the external: when their plate was empty; when their companion had finished eating; or when -- quelle horreur! -- the credits started to roll on the TV show they were watching.