In January 2018 researchers from Sweden published the results of their study to assess the effect of chocolate consumption on the risk of atrial fibrillation. A total of 40,009 men and 32,486 women were included in the study and followed up for an average of 14.6 years. A total of 9,978 cases of atrial fibrillation were diagnosed during this time. Results showed that chocolate consumption did not appear to be associated with risk of atrial fibrillation. In addition, a review of the scientific literature was undertaken, and results also showed that chocolate consumption did not appear to be associated with risk of atrial fibrillation.
Larsson SC et al. Chocolate consumption and risk of atrial fibrillation: Two cohort studies and a meta-analysis. Am Heart J. 2018 Jan;195:86-90