Picture this all-too-familiar scene: It’s lunch time at school. You sit down to a healthy lunch, which is, of course, an oversized salad, topped with bean sprouts and of course, low-calorie, fat-free dressing. You finish your lunch, but still feel uncomfortably... unsatisfied. Out of the corner of your eye, you suddenly spot your friend indulging in an oversized bag of mini Oreos, while simultaneously complaining about falling off her diet. Of course, out of sincere goodwill and concern for your friend’s health, you offer to help her with the gargantuan task of finishing the bag. You indulge. You feel gross. And your healthy lunch is history. Why does this scene seem so familiar to so many? What went wrong?