Researchers Erikka Loftfield, Marilyn C. Cornelis and Neil Caporaso used data collected over a decade from around half a million British volunteers.
But Loftfield cautioned that because this was an observational study, it can't prove that coffee caused people to live longer. But this is the first large study to show a benefit regardless of a drinker's caffeine metabolism.
In one study of nearly half a million people spread out across 10 European nations, researchers found that drinking three cups of coffee a day may help you live longer.
Additionally, "coffee drinkers were more likely than abstainers to drink alcohol and smoke, but the researchers took those factors into account, and coffee drinking seemed to cancel them out".
In a 10-year follow-up period, around 14,000 people in the study died (the leading causes of death were cancer, cardiovascular disease and respiratory diseases). Drinking filter coffee instead of espresso increases polyphenols and removes substances that contribute to "bad" low-density lipoprotein cholesterol. Using non-coffee drinkers as the reference group, the scientists were able to surmise that drinking instant, ground, and decaffeinated coffee was "inversely associated with mortality". Among at least the generally healthy individuals from the United Kingdom enrolled in this study, coffee drinkers seem to gain health benefits from the habit.
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A new study provides more good news for coffee lovers.
Researchers convinced 498,134 British men and women to fill out questionnaires that described their daily coffee consumption.
"But here's a situation where there was always some feeling of, 'Oh, can't be - I enjoy it too much, it can't be good for me.' And now we're finding out that it's good".
Decaf, instant, fancy pricey coffee from that gourmet shop down the road - apparently the type of coffee doesn't matter, the study said.
Drinking coffee could be beneficial, regardless of whether a person metabolizes the drink quickly or slowly. But non-coffee drinkers were more likely to have died than coffee-drinkers. Indeed, only a fraction of the people in the study reported drinking 8 or more cups of coffee a day, she added - about 10,000 of the 500,000 participants.
And the researchers say there's no added benefit to drinking more coffee than one usually does. So the next time someone says they're trying to limit their coffee consumption, you can tell them not to worry about it. However the association with a lower risk of death was observed both for slow and fast metabolisers of caffeine.