Research claims that dark chocolate and cocoa can lower “bad” LDL cholesterol. In one study, healthy adults drank a cocoa beverage twice a day for a month. They experienced a reduction in “bad” LDL cholesterol. Their blood pressure also decreased and their “good” HDL cholesterol increased. Cocoa and dark chocolate also seem to protect the “bad” LDL cholesterol in your blood from oxidation, which is a key cause of heart disease.