Studies suggest that drinking black tea can provide cardiovascular benefits. A study conducted by the Netherlands National Institute of Public Health found a strong correlation between the consumption of black tea and the decreased risk of strokes. One of the key findings from the study was that drinking 4 cups of tea a day significantly reduced risks of suffering from heart attacks and strokes.
A study at Boston’s School of Medicine as noted that the drinking of black tea all improved the functioning of the boys blood vessels within only a few hours of consumption!
While in tea terms, black tea has the highest caffeine content, yet in general terms it still only contains around 40% of the caffeine content of a cup of coffee. Studies indicate that a daily dose of 300mg caffeine will not have adverse effects on health. A British study published in the European Journal of Clinical Nutrition also found that while black tea does contain significant quantities of caffeine and diuretic compounds, the drink does not work to dehydrate the body as it normally would.