BBC News reported on research designed to find out if chocolate exacerbates acne. Samantha Block, of the University of Miami’s Miller School of Medicine, conducted several studies to determine just that. The first study, which was published in the Journal of the American Academy of Dermatology, involved “10 male volunteers between the ages of 18 and 35” who ate “varied amounts of chocolate (up to 340g, or 12oz) on day one of the experiment.” Block then assessed breakouts on participants’ faces one day four and seven. She found that “acne increased on the participants’ faces, in proportion to the amount of chocolate they had eaten.” She then repeated the study in a more rigorous fashion, randomizing participants to capsules filled with either gelatin or 100% cocoa powder. The results of that study, which were presented at the American Academy of Dermatology’s annual meeting, mirrored those of the first: The more cocoa consumed, the more that participants’ acne flared up.