MILWAUKEE - One of life's simple pleasures just got a little sweeter. After years of waffling research on coffee and health, even some fear that java might raise the risk of heart disease, a large study finds the opposite: Coffee drinkers are a little more likely to live longer. Regular or decaf doesn't matter.
The study of 400,000 people is the largest ever on the issue, and the results should reassure any coffee lovers who think it's a guilty pleasure that may do harm.
"Our study suggests that's really not the case," said lead researcher Neal Freedman of the National Cancer Institute. "There may actually be a modest benefit of coffee drinking."
No one knows why. Coffee has a thousand things that can affect health, from helpful antioxidants to tiny amounts of substances linked to cancer. The most widely studied ingredient - caffeine - did not play a role in the new study's results.
It's not that earlier studies were wrong. There is evidence that coffee can raise LDL, or bad cholesterol, and blood pressure at least in the short term, and those in turn can raise the risk of heart disease.
Even in the new study, it first seemed that coffee drinkers were more likely to die at any given time. But they also tended to smoke, drink more alcohol, eat more red meat, and exercise less than non-coffee-drinkers. Once researchers took those things into account, a clear pattern emerged: Each cup of coffee per day nudged up the chances of living longer.
The study was done by the National Institutes of Health and AARP. The results are in Thursday's New England Journal of Medicine.
Careful, though. This doesn't prove that coffee makes people live longer, only that the two seem related.
But with so many people, more than a decade of follow-up, and enough deaths to compare, "this is probably the best evidence we have" and are likely to get, said Frank Hu, a professor of nutrition and epidemiology at the Harvard School of Public Health. He had no role in this study but helped lead a previous one that also found coffee beneficial.
The new one began in 1995 and involved AARP members ages 50 to 71. People who had heart disease, a stroke or cancer weren't included. Neither were folks at diet extremes.
The rest gave information on coffee drinking once, at the start of the study. "People are fairly consistent in their coffee drinking over their lifetime," so the single measure shouldn't be a big limitation, Freedman said.
Of the 402,260 participants, about 42,000 drank no coffee. About 15,000 drank six cups or more a day. Most people had two or three.
By 2008, about 52,000 of them had died. Compared with those who drank no coffee, men who had two or three cups a day were 10 percent less likely to die at any age. For women, it was 13 percent.
Even a single cup a day seemed to lower risk a little: 6 percent in men and 5 percent in women.
About two-thirds of study participants drank regular coffee, the rest decaf.