Sit back, grab a hot cup of coffee, and find out how this warming, beautiful (and necessary) drink became so popular.

Heavy coffee drinking - more than five to six cups per day, for instance - can elevate heart rates, increase blood pressure and, in sensitive people, may increase the risk of arrhythmias.

The researchers found that compared with people who did not drink coffee, morning coffee drinkers were 16% less likely to die of any cause and 31% less likely to die of cardiovascular disease.