Habitual tea drinking appears to significantly reduce the risk of developing hypertension. Of 1507 Taiwanese men and women, 600 were regular tea drinkers, defined as drinking 120ml or more a day.

Compared with non-habitual tea drinkers, the risk of developing hypertension decreased by 46% for those who drank 120 to 599 ml a day and was further reduced by 65% for those who drank 600 ml a day or more after adjusting for age, sex, socioeconomic status, family history of hypertension, body-mass index, waist:hip ratio, lifestyle factors (total physical activity, high sodium intake, cigarette smoking, alcohol consumption and coffee drinking) and dietary factors (vegetable, fruit, unrefined grain, fish, milk, visible-fat food and deep fried food intake). (Arch Intern Med 2004; 164: 1534–40).