Coffee drinkers live longer

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 US National Cancer Institute.

"There may actually be a modest benefit of coffee drinking."

No one knows why. Coffee contains many things that can affect health, from helpful antioxidants to tiny amounts of substances linked to cancer.

And the most widely studied ingredient – caffeine – didn't play a