The randomized, double-blind study by Swinburne University of Technology published in the Journal of Psychopharmacology found that people consuming high cocoa flavanol dark chocolate reported more positive mood states.
Sample size
Seventy-two healthy men and women aged 40-65 were asked to consumer a 20 g dark chocolate drink mix with either 500 mg of cocoa flavanols, 250 mg or no cocoa flavanols for 30 days.
Participants did not know which type of drink they were consuming.
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