A second study in the same journal seemed to back up the claim.
Two new large studies published Monday, July 10, in the Annals of Internal Medicine showed that coffee could extend one's life through reducing the risk of death from heart disease, stroke, diabetes, or even cancer.
They came to their conclusions after analysing data of healthy people over the age of 35 from 10 European Union countries. Also, the more coffee people drank, the more they smoked: among those who drank four cups or more per day, just 26 percent had never smoked. Coffee, however, had no effect on the risks of dying from pneumonia, flu, Alzheimer's disease, suicide, or accidents.
The researchers noted that in the United States, about 75 percent of adults drink coffee, and 50 percent drink it daily.
None of those studies prove coffee, per se, provides the benefit.
Coffee is one of the most widespread drinks in the world.
While the research can not prove point blank that drinking in coffee will result in a longer life, the study shows a strong association.
And even if they were to be certain it was the coffee that was responsible, not every risk improved. After considering factors like diet and smoking, researchers found that the group with the highest consumption of coffee had a lower risk for all-causes of death.
Despite the people being so different from country to country, the researchers saw a consistent relationship, said co-lead author Neil Murphy, of the Inter Agency for Research on Cancer in Lyon, France.
It is also possible some of those people became unwell while having their regular brews.
Previous studies have shown conflicting and often contradictory results.
Both studies adjusted findings to take into account that people who drink larger amounts of coffee are likely to smoke tobacco products as well.
For instance, the European study left out people who had cancer, heart disease or diabetes, in other words it studied people over 35 who were already more or less healthy.
Sattar said that one disadvantage of the research was that the fact that people stop drinking coffee - or drink less of it - when they are ill, a "bias is very hard to fully overcome". Just take it as a little bit of evidence that your coffee habit might not be as terrible as everyone thinks. Too much caffeine may also increase the risk of miscarriage. For example, the polyphenols found in coffee act as antioxidants, which helps cells survive from the damaging effects of molecules called free radicals. Two to three cups increased this to 18 percent.
How could we ever be sure whether coffee makes you live longer?
According to the accompanying editorial, a protective effect of coffee is biologically plausible because polyphenols and other bioactive compounds in it have antioxidant properties, which are linked to reduced insulin resistance, inflammation, and biomarkers of liver function. These subjects hailed from 10 different European countries, each with their distinctive styles of coffee consumption, such as the espresso sippers of Italy and the cappuccino-lovers of the UK.