From the BBC News website:
Volunteers are wanted by researchers to see how compounds in dark chocolate might help fight heart disease.
The scientists in Aberdeen aim to assess how flavonoids, found naturally in cocoa, could fend off disease.
Forty volunteers aged between 18 and 70 will be asked to eat a cocoa-rich dark chocolate specially made for the study, standard chocolate, or white chocolate.
Sadly, being diabetic rules me out.
LabRat