The latest coffee research shows that people with a particular gene responsible for slow coffee processing may be more prone to heart attacks. Such coffee drinkers who have more than three coffees a day are at increased risk of suffering a heart attack.

It is not known how common this gene variation in the world is but it has been estimated that up to a third of Caucasians may carry it.

A gene, known as *1F, is responsible for slower metabolism rate and it increases the chances of suffering from heart attack in those people who drink large amounts of coffee. On the other hand, a different variant of the same CYP1A2 gene, called *1A, was found to play an important role in protection of heart attacks. People who carried that gene and drank one cup of coffee a day appeared to halve the odds of a heart attack while drinking two or three cups cut the risk by about 40%.

These new findings finally shed some light on a constant controversy about the coffee effects on our health.

Previous researches accused coffee of over-stimulating the nervous system, raising levels of stress hormones in the blood, leading to miscarriages and stillbirths in pregnancy but also pointed out on some coffee benefits like preventing high blood pressure, and reducing risks of gallstones.

In the end, a conclusion has been made that a one cup of coffee carries no harm no matter what are genetic make-up looks like.