Conducted over a decade, the study found that coffee drinkers lived longer on average than those who abstained - whether they drank instant, ground, or decaf.
Over the 10 years of follow up (median, 7 years) the study found that participants with lower CMSG scores had similar associations between coffee drinking levels and mortality as participants with higher scores, "indicating no modification of the association between coffee drinking and all-cause mortality by these common polymorphisms related to caffeine metabolism". People who drank six to seven cups were 16% less likely to die, and people who drank eight or more cups were about 14% less likely to die.
A new study suggests coffee can be part of a healthy diet. Simply drinking coffee isn't necessarily a health panacea.
Because some people's genetics make them slower to metabolize caffeine, the researchers wanted to see if that made coffee consumption riskier for these individuals.
I hope you're reading this while drinking a cup of coffee.
Experts say that coffee is beneficial for health not just because of the caffeine but because of other compounds and antioxidants that they contan.
For many of us, a day hasn't properly started until we've had our first cup of coffee.
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The results do not prove that your coffee pot is a fountain of youth, nor are they a reason for abstainers to start drinking coffee, said Alice Lichtenstein, a nutrition expert at Tufts University in the U.S. who was not involved in the research.
Lead author Dr Erikka Loftfield, a cancer epidemiologist, said the results applied to all types of coffee including ground, instant and decaffeinated.
But this latest research is particular noteworthy because the team tapped into the data of 498,134 British people voluntarily registered with the UK Biobank genetics database, then logged deaths over a 10 year period. Coffee drinking was inversely associated with all-cause mortality, that is more coffee a person drank less were the risks of that person dying.
This study also looked at another question scientists have been asking: how genetics affects coffee consumption.
Other studies have suggested that substances in coffee may reduce inflammation and improve how the body uses insulin, which can reduce chances for developing diabetes.
And the researchers say there's no added benefit to drinking more coffee than one usually does. Researchers noticed an inverse association between drinking coffee and the risk of death, regardless of whether individuals metabolized it quickly or slowly.
That means, for example, if you're adding 500 calories of cream and sugar to a coffee beverage the size of a Big Gulp, you might want to keep an eye on that.