Atrial fibrillation increases a person’s risk of strokes, heart failure and cognitive impairment. The strongest overall effects were seen in men and women who ate 1 ounce of chocolate, two to six times per week, said the lead author of the study, Elizabeth Mostofsky, a researcher at the Harvard T.H. Chan School of Public Health and at Beth Israel Deaconess Medical Center in Boston. The new study also included adults who had been clinically diagnosed with atrial fibrillation. The researchers analyzed data collected from more than 55,000 adults between ages 50 and 64 in Denmark. Even if other factors – as alcohol consumption, obesity, hight level blood pressure and smoking – were considered, if people ate chocolate the conclusion of the study remained valable, so eating chocolate is a good thing.