Bittersweet chocolate is a bit different than regular, sweet chocolate. The difference is that it contains a high range of cocoa (50%-90%), the main ingredient here. Keep in mind that the darker the chocolate, the better! When you consume this kind of chocolate, it tells your brain to release endorphins, which are feel-better chemicals that help manage stress and thus increase feelings of happiness. Cocoa also progresses blood flow to your brain, which means that for the elderly, it betters their mental function by easing their production of words and helps them feel more balanced.