Dark chocolate is harder, tastes slightly bitter, and generally refers to cocoa solids, the content of which is seen between 70% and 99%, or less than 12% of milk fat. Two groups of German researchers published a short study in the Journal of the American Medical Association, which focused on the effects of dark chocolate and white chocolate, and the subjects ate a small piece of chocolate every day for 2 weeks. One of the doubts about the consumption of dark chocolate to lower blood pressure is that it contains cocoa ingredients with high calories, which can easily lead to obesity, the researchers let the volunteers eat 30cal of dark chocolate per day, and at the end of the experiment found that the blood pressure of the dark chocolate group was reduced, but the weight did not increase, so dark chocolate has a certain role in lowering blood pressure.