Dark secrets of (dark) cocoa
Prior studies have found health benefits from cocoa antioxidant polyphenols. In this study, doctors gave 72 healthy adults a dark chocolate drink containing 500 mg or 250 mg of cocoa polyphenols per day, or a placebo. After 30 days, compared to placebo, those who had taken the high dose of cocoa polyphenols reported having a much greater sense of calmness and overall contentedness. While the polyphenols didn't appear to change mood within a couple of hours of drinking cocoa, the general overall mood benefits appeared over time, with participants reporting dark cocoa mood improvements at 30 days.

Reference: Journal of Psychopharmacology; 2013, Vol. 27, No. 5, 451-8
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