Forget about an apple a day. If you really want to keep the doctor away, try a piece of chocolate instead. Regularly snacking on cocoa-flavored treats can help protect your brain from cognitive decline, according to a new review from the University of L'Aquila in Italy. Packed with both antioxidants and iron, dark chocolate has already made a name for itself as a smart choice for dessert lovers. Its potential brain-boosting powers only sweeten the deal.