How much coffee is good for you? - in 90 secs
3 March 2015 Last updated at 17:45 GMT
Drinking a few cups of coffee a day may help people avoid clogged arteries - a known risk factor for heart disease - Korean researchers believe.
They studied more than 25,000 male and female employees who underwent routine health checks at their workplace.
However, other studies have linked consumption to heart risk factors, such as raised cholesterol or blood pressure.
BBC News tries to clear the confusion.
Video produced by Sara Barman