How watching others eat junk food can cut our appetite and help us lose weight

One evening, at home. You’re sat comfortably on the sofa, watching your favorite TV show. An ad comes up, showing a scrumptious burger in its full glory. The camera zooms into each ingredient: the crisp salad; the tender meat; the rich, creamy sauce; the crunchy French fries, and one person enjoying this delightful flavor range. You think to yourself that your diet is about to take a hit. But we beg to differ.