For people with atrial fibrillation (afib), doctors have often recommended limiting caffeine because it can speed up the heart rate. But a recent study suggests that daily coffee consumption might actually help reduce the frequency of afib episodes in those already diagnosed with the condition.
Atrial fibrillation is a common heart rhythm disorder affecting an estimated 10.5 million Americans – roughly one in 20 adults. It disrupts the heart’s regular beat, increasing the risk of blood clots, stroke, heart failure, and other complications. While treatments exist, managing afib effectively often involves lifestyle changes.
This new research flips the script on previous advice. A randomized clinical trial involving 200 participants across the U.S., Canada, and Australia found that those who drank at least one cup of caffeinated coffee daily experienced a 39 percent lower risk of recurring afib episodes compared to those who abstained from coffee entirely.
Here’s what the study revealed:
- Participants: Roughly two-thirds were men, with an average age of 69. Most had a history of regular coffee consumption and afib, and about half were already taking afib medications. All participants had previously undergone cardioversion – a procedure to restore a normal heart rhythm.
- The Breakdown: Over six months, one group drank at least one cup of caffeinated coffee daily while the other avoided it.
- Results: 47 percent of those who continued drinking coffee experienced afib or flutter episodes compared to 64 percent in the group that stopped consuming caffeine.
Importantly, hospitalization rates for heart failure or stroke remained similar in both groups.
Why This Matters : While previous observational studies hinted at a possible link between caffeine and afib risk reduction, this randomized trial provides stronger evidence, according to Dr. Omar K. Siddiqi, a cardiovascular medicine specialist at Boston University’s Chobanian and Avedisian School of Medicine.
Dr. Gregory Marcus, lead author of the study from UCSF Health, emphasized that “caffeine’s health effects have generally been understood using flawed study designs, namely observational studies — and not randomized trials.” This new research addresses this gap by providing more robust data.
Important Nuances:
- Individual Sensitivity: While these findings are encouraging, it’s crucial to remember that caffeine affects people differently. Those whose arrhythmias are triggered by caffeine should still limit their intake as advised by their doctor.
- Study Limitations: Participants self-reported coffee consumption, which can introduce inaccuracies. Additionally, the trial involved a relatively smaller sample size and lacked blinding (participants knew their treatment assignment).
The Takeaway : This study suggests that for those with afib who already enjoy coffee, moderate daily consumption likely won’t worsen their condition and might even be beneficial. However, more research is needed to confirm these findings and explore the effects of different caffeine levels and types on afib risk. As always, consulting your healthcare provider about your specific situation remains essential.
