I suspect the last two paragraphs may explain the research results of this study:
"This is an interesting finding which seems to contradict all previous studies, said Professor Hugh Tunstall-Pedoe, co-author of the study. "It might be attributable to a real effect of coffee or to chance. Coffee and tea drinking habits may be simply identifying two groups of people with very different lifestyles," he said.
The researchers found that in extreme cases people drank up to 21 cups of coffee and 36 cups of tea a day. Coffee drinkers tended to be younger and increasing tea consumption was found to be associated with increasing social and economic deprivation.
My Etsy shop (currently closed for the summer)