Black tea contains a number of antioxidants, which are compounds that help the body fight free radicals (chemical by-products known to damage DNA). These antioxidants include quercetin, a substance said to combat inflammation and support healthy immune function.
Black Tea Benefits
Here's a look at the science behind black tea's health effects:
1) Black Tea and Cardiovascular Health
To date, research on black tea's cardiovascular benefits has yielded mixed results. For instance, a 2009 review of nine previously published studies (including a total of nearly 195,000 participants) concluded that drinking three cups of black or green tea daily reduced risk of stroke by 21 percent. However, a 2007 study of 31 adults (ages 55 and older) found that six months of black-tea consumption did not significantly influence any cardiovascular risk factors (such as inflammation and systolic blood pressure). Both the National Center for Complementary and Alternative Medicine and the National Institutes of Health point to this study as evidence that black tea may have no impact on cardiovascular health.
2) Black Tea and Diabetes
In a laboratory study published in 2009, scientists discovered that compounds extracted from black tea were more effective at slowing the absorption of blood sugar than those extracted from green tea and oolong tea. Additionally, a 2009 population study of 1,040 elderly adults found that long-term intake of black and/or green tea was associated with lower prevalence of diabetes.
By Cathy Wong
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