Hot tea is widely consumed across the globe, and that could be paying healthy dividends for the billions of people who look forward to their daily cup each day. A small study published in the Journal of Hypertension found that drinking black tea could improve cardiovascular function. A separate study also found that drinking black tea and green tea could decrease risk of stroke and coronary heart disease. Black tea drinkers should keep in mind that, unlike most teas, black tea is caffeinated, so moderation is best to ensure the benefits of black tea are not offset by the overconsumption of caffeine.