A prospective cohort study found that drinking black tea may be associated with a moderately lower mortality risk. The risk was lowest among persons drinking two or more cups of tea per day. The findings are published in Annals of Internal Medicine.

Tea is one of the most consumed beverages worldwide. Previous research has suggested an association between tea consumptions and lower mortality risk in populations where green tea is the most common type of tea. In contrast, published studies in populations where black tea drinking is more common are limited with inconsistent findings.

Researchers from the National Institutes of Health conducted a study to evaluate the associations of tea consumption with all-cause and cause-specific mortality using data from the U.K. Biobank, where black tea drinking is common. They also assessed whether the associations differ by use of common tea additives (milk and sugar), tea temperature, and genetic variants affecting the rate at which people metabolize caffeine. The U.K. Biobank includes data on a half a million men and women, aged 40 to 69 years, who completed a baseline questionnaire between 2006 and 2010. Of those, 85 percent reported regularly drinking tea and of them, 89 percent reported drinking black tea. Relative to tea nondrinkers, participants who reported drinking 2 or more cups each day had 9 to 13 percent lower risk for mortality. The associations were observed regardless of whether participants also drank coffee, added milk or sugar to their tea, their preferred tea temperature, or genetic variants related to caffeine metabolism.

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