A study22 that followed 8522 Japanese men and women
over a period of 12 years found that men who drank 10 cups
(32 ounces) of green tea daily had a 58% reduced risk of
death from coronary heart disease compared to those who
drank 3 cups a day (10 ounces) or less. A Dutch study over
6 years of 4807 men and women showed that those who drank
more than 3 cups (13 ounces/day) of black tea had a 68%
reduced risk of myocardial infarction over nontea drinkers. In
a study of 55223 elderly Dutch men over a period of 15 years,
the risk of stroke for those who drank more than 4.7 cups/day
(20 ounces/day) of black tea was only 31% that of men who
drank less than 2.6 cups/day (11 ounces/day).