In June 2016 researchers from the USA and Denmark published the results of their study to assess the effect of coffee consumption on risk of atrial fibrillation. 57,053 individuals (27,178 men and 29,875 women) aged 50-64 years were included in the study and followed up for an average of 13.5 years. Information on coffee consumption was collected via a food-frequency questionnaire. A total of 3,415 cases of atrial fibrillation were diagnosed during this time. Results showed that a higher coffee consumption was associated with a lower risk of atrial fibrillation.