Health: Drinking coffee may REDUCE the risk of heart rhythm disorders, study finds

Drinking coffee may REDUCE risk of heart arrhythmias – each extra daily cup lowers chance by 3 percent, surprising study shows

  • University of California experts studied 386,258 participants over approximately 5 years
  • The data comes from the UK Biobank’s collection of genetic and health data
  • They found that advice to drink less coffee to prevent arrhythmias is unfounded
  • Genetic variations in caffeine metabolism did not affect the benefit of coffee

Coffee may give you the creeps, but it may reduce your risk of abnormal heart rhythms — or “arrhythmias,” a surprising study has concluded.

Researchers led by the University of California, San Francisco, analyzed the impact of coffee consumption on the incidence of arrhythmia in more than 380,000 people.

They found that each extra cup one consumes daily appears to lower the risk of developing an irregular heart rhythm by 3 percent.

Coffee may give you the creeps, but it may lower your risk of abnormal heart rhythms – or ‘arrhythmias’ – according to a surprising study (stock image)

The study was conducted by bioengineer Eun-jeong Kim of the University of California, San Francisco and colleagues.

“In this prospective cohort study, a greater amount of regular coffee intake was associated with a lower risk of arrhythmia,” the researchers wrote in their paper.

This was the case, they added, “especially for atrial fibrillation and supraventricular tachycardia, with no evidence that genetically determined differences in caffeine metabolism altered these associations.”

“General bans on caffeine to reduce the risk of arrhythmia are probably unjustified.”

In their research, Dr. Kim and colleagues provided health data, genetics, and coffee consumption habits from 386,258 participants over the course of about 5 years.

The data for the study was collected by the UK Biobank, a large-scale database containing detailed genetic and health information on half a million participants.

During the follow-up period, 16,979 participants were diagnosed with an incident arrhythmia.

After adjusting for confounding factors — such as demographics, comorbid conditions and lifestyle habits — the team found that each additional regular cup of coffee consumed reduced the risk of occasional arrhythmia by 3 percent.

Further analyzes revealed similar, statistically significant reductions in the risk of both atrial fibrillation and supraventricular tachycardia, specifically.

In the final part of the study, the team looked at whether seven different genetic variants known to affect caffeine metabolism altered the relationship between coffee consumption and arrhythmia risk — and concluded they had no effect.

A Mendelian randomization study involving the same genetic variants also revealed no association between variations in caffeine metabolism and the risk of developing abnormal heart rhythms.

The study’s full findings were published in the journal JAMA Internal Medicine.


Caffeine has been found to be safe for consumption in doses up to 400 mg per day for the general population.

Studies suggest it may have a variety of health benefits, including fighting liver disease and type 2 diabetes.

Research has even suggested it could even help people live longer.

It is the world’s most consumed stimulant and reports show that it can increase daily energy expenditure by about five percent.

Researchers have said that combining two to four cups of coffee a day with regular exercise would be even more effective for weight maintenance.

A 2015 study showed that just a few cups a day can help millions of dieters stay fit once they reach their desired weight.