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. For the current study, the researchers analyzed information provided by about 500,000 people, who answered questions about their coffee consumption, smoking and drinking habits, health history and more.
On the basis of this study, some people who were holding back on coffee because of lingering health concerns may want to drink a little more if they want to, professor Lichstenstein says.
In other words while coffee drinking has some benefits especially in dealing with non-communicable diseases, your genes decide how well you metabolise caffeine.
As with all studies like this in which researchers observe a group of people over time, this study can't prove that coffee is the cause of the reduced risk of death.
She said: "In this large study of almost 500,000 people in the United Kingdom, coffee drinking was inversely associated with all-cause mortality, with statistically significant inverse associations observed in participants drinking 1 to 8 or more cups per day".
"There are many potential beneficial compounds in coffee - there are literally hundreds and thousands of compounds in coffee", he said.
The research, which was published in the JAMA medical journal, states that over the 10-year study, 14,225 participants died.
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Your morning cup of joe - or several, for that matter - could be the key to a longer life. But she said the results reinforce previous research and add additional reassurance for coffee drinkers. The meta-analysis - as these studies are called, found that drinking three to four cups of coffee daily could have a beneficial effect of the body rather than cause harm.
The research didn't include whether participants drank coffee black or with cream and sugar. Researchers noticed an inverse association between drinking coffee and the risk of death, regardless of whether individuals metabolized it quickly or slowly.
It might be that some other factor - like wealth, or education, or proximity to a coffee shop - is contributing to both higher levels of coffee drinking and lower rates of mortality.
Walter Willett from the Harvard School of Public Health reveals in 2015 that the coffee bean is actually packed with nutrients and phyto-chemicals such as lignans, quinides, and magnesium. A 2014 study found that there was zero evidence of dehydration with moderate daily coffee intake.
Whatever it is, there have been multiple studies that point to coffee's health benefits.