Coffee consumption does not increase the risk of developing atrial fibrillation (a-fib), despite some previous concerns about caffeine, according to a study in BMC Medicine.
Swedish researchers followed 76,000 people (without a-fib at the start) for up to 12 years and found that even high coffee consumption (five or more cups a day) was not associated with increased risk of a-fib, the most common type of irregular heartbeat. This was confirmed by their analysis that added in data from four previous studies that looked at coffee and a-fib risk in almost 250,000 people. While many studies have found that coffee intake is associated with a decreased risk of heart attacks and strokes, research focusing on a-fib has been unclear.
Also see Coffee and Your Health.