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The high amount of polyphenols — an antioxidant — found in dark chocolate can boost your mood. We're not talking Twix or Three Musketeers here. Select the chocolate with the most cocoa you can find for the best results. A bar with 70- percent or more cocoa is ideal, like this 70-percent dark chocolate bar with Kona coffee and cacao nibs grown in the Puna district of Hawaii's Big Island. Price: $7.95.