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Drinking caffeinated coffee may not only be safe for people with atrial fibrillation (A-fib) — it could actually protect against the recurrence of this common heart rhythm disorder, according to a new study.
The findings come from the DECAF (Does Eliminating Coffee Avoid Fibrillation?) study, a four-year clinical trial presented at the American Heart Association’s annual conference and published in JAMA.
Atrial fibrillation affects more than 10 million Americans and millions more worldwide. It causes irregular heartbeats, palpitations, and fatigue — and can increase the risk of stroke, heart failure, and blood clots.
For years, doctors have debated whether caffeine — known to raise heart rate and blood pressure — might trigger A-fib episodes. This new research suggests otherwise.
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What the Study Found
Dr. Gregory Marcus, a cardiologist and professor at the University of California, San Francisco, led the DECAF study. Researchers followed 200 adults in the U.S., Canada, and Australia, most of whom were in their 70s and had previously experienced A-fib.
Participants were split into two groups:
- One group avoided caffeine entirely.
- The other had at least one cup of caffeinated coffee daily.
Over six months, participants tracked their habits via telehealth visits and ECG data.
The results were striking:
- 47% of coffee drinkers experienced a recurrence of A-fib or atrial flutter, compared to 64% in the no-coffee group.
- Coffee drinkers also went longer before their first irregular heartbeat episode.
Even though a few participants in the caffeine-free group admitted to sneaking in a cup or two, the difference remained significant.
Expert Insights
“I was somewhat surprised at the magnitude of how protective caffeinated coffee does seem to be to prevent atrial fibrillation,” Dr. Marcus said.
Dr. Johanna Contreras, a cardiologist at Mount Sinai Fuster Heart Hospital in New York, who was not involved in the study, agreed the findings are encouraging.
“The most important takeaway is that drinking a cup of coffee a day appears perfectly safe for people with A-fib,” she said. “There’s not a hard-and-fast rule — everyone reacts differently to caffeine.”
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How Coffee Might Help
Researchers are still exploring why coffee may protect the heart. Dr. Marcus suggested two possibilities:
- Coffee contains anti-inflammatory compounds that may reduce A-fib recurrence.
- Caffeine’s mild stimulation of the adrenaline response could counteract the “rest and digest” nervous system activity that sometimes triggers A-fib episodes.
However, the study only included people whose A-fib had been resolved or treated — meaning the results may not apply to those with ongoing irregular heart rhythms.
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Moderation Still Matters
Experts caution that moderation is key.
“One cup a day seems fine,” said Dr. Contreras. “But six or seven cups, plus energy drinks, is a very different story.”
The researchers also note that lifestyle factors like exercise, diet, and sleep weren’t tracked — meaning coffee drinkers may have had other protective habits.
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The Bottom Line
For people with a history of A-fib, this study offers welcome reassurance:
“You can enjoy your morning cup of coffee without worry,” said Dr. Contreras.
While more research is needed, moderate coffee consumption appears safe — and possibly protective — for heart rhythm health.