Chocolate certainly brings a smile to my face. And there’s actually a scientific reason why! Chocolate’s antioxidants may help lower levels of cortisol—the so-called stress hormone. Stressed-out people who ate 1.4 ounces of dark chocolate daily for two weeks had lower levels of stress hormones, including cortisol, in a study done recently at the Nestlé Research Center in Switzerland. Choose dark chocolate with the highest cacao content to get the most antioxidant—and be mindful of the 230 calories in 1.4 ounces of chocolate.