April 21st is designated National Tea Day in the UK, and in recognition of this our posts today will address some of the possible health benefits of tea.
Tea is derived from the leaves and buds of the evergreen shrub Camellia sinensis. It is the most widely consumed drink in the world, other than water.
Chinese researchers recently published results of a meta-analysis of several prospective cohort studies, examining the relationship between tea consumption and mortality of all cancers, as well as tea consumption and cardiovascular disease.
The researchers identified 62 published articles, and then narrowed this down to 18 studies. These studies involved thousands of subjects, with a follow-up period ranging from 3 to 28 years. The studies encompassed both black and green tea.
A dose-response analysis was performed which showed that a one cup unit of green tea per day was associated with a 5% lower risk of cardiovascular disease, while a one cup per day increment of black tea was associated with a 8% lower risk of cardiovascular mortality.
The inverse association between green tea consumption and cardiovascular mortality was more apparent in women than men. The reason for this is not clear.
In looking at tea consumption and all-cause mortality the dose-response analysis showed that a one cup per day increment of black tea was associated with a 3% lower risk of all-cause mortality, whereas a one cup per day unit of green tea consumption was associated with a 4% lower risk of all-cause mortality.
Given these possible health benefits of both black and green tea, let’s have a cup in honor of National Tea Day!
(Source- British Journal of Nutrition, 2015, 114)
This blog is a review of medical and scientific literature, and should only be used for informational purposes. It does not constitute medical or health advice, nor does it create a physician-patient relationship with anyone. Discuss any health concerns with your personal physician.