We know that our brain plays tricks on us, but did you know the size of your plate can dictate how much you eat? Or that a bowl filled with jelly beans in a variety of colors will induce you to eat more than a series of bowls with the jelly beans separated out by color? Rachel Herz, a neuroscientist at Brown University and the author of “Why You Eat What You Eat: The Science Behind Our Relationship With Food,” describes the psychology that influences our eating habits.