Genes dictate whether coffee is good or bad for us

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Coffee can increase or reduce your risk of suffering a heart attack - depending on your genes, , according to a new study.

People who metabolise caffeine more slowly have a 36% increased risk if they drink two to three cups of coffee a day.

And if they drink more than four cups, this risk rises to 64%, reports New Scientist.

But people who metabolised caffeine quickly and consumed two to three cups of coffee a day had a 22% reduction in the risk of heart attack.

“Our data suggest that the longer caffeine is lingering in the system, the more harm it can do,” says Ahmed El-Sohemy at the University of Toronto, Canada, who led the study.