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main-page >> TCM-Info >> DietTherapy >> Text
Daily Tea Consumption Reduces Risk of Hypertension

2007-2-8 7:52:49 Viewed: [ Font:Large Medium Small] [ Close]


After water, tea is the most widely consumed beverage in the world. A staple of Chinese culture and cuisine for centuries, more than 350 varieties of tea are known to exist, with approximately 300 grown in China alone. Researchers estimate that certain varieties of tea can contain more than 4,000 chemical compounds. While some of them have been shown to reduce blood cholesterol levels, and may even protect the body against certain types of cancer, the vast majority of the ingredients in tea may affect the body in ways that have yet to be determined.


One area of research that has intrigued scientists for years is the apparent ability of tea to treat hypertension. In China, regular tea consumption has long been associated with reduced blood pressure, while animal studies conducted in Japan in elsewhere have shown that long-term use of green tea can lower blood pressure substantially. To date, however, comparatively few studies have examined the role of green tea in reducing blood pressure levels in humans.

To determine the effects regular tea consumption could have on reducing the incidence of hypertension, a group of scientists led by Dr. Yi-Ching Yang recruited 1,507 men and women living in Tainan, a large city in southern Taiwan. All of the participants were at least 20 years old, and had no previous history of high blood pressure. Blood pressure readings and body mass index measurements were taken by physicians and trained nurses at the start of the study as part of a screening health examination.

The subjects were divided into two groups based on reported tea consumption. Those who drank less than 120 milliliters (approximately 4 ounces) per day were labeled non-habitual tea drinkers. The remaining subjects, habitual tea drinkers, drank at least 120 milliliters of tea per day for one or more years, and were further divided based on tea intake: 120-599 milliliters per day and 600 or more milliliters per day.

Because the size of the cup used in drinking tea varies widely in Chinese culture, participants were asked to provide details about what kind of cup was used, how the tea was prepared, the amount drank, and the frequency of drinking to calculate average daily tea consumption as accurately as possible. Participants were also asked to record what kind of tea they used (black, green or oolong), and whether milk and/or sugar were added.

In addition to tea consumption, the study participants were asked about a variety of lifestyle and dietary factors, including cigarette smoking, amount and duration of physical activity, sodium intake and types of food eaten.

Results

Approximately 40 percent of the participants met the criteria for habitual tea consumption. An overwhelming majority (96.3 percent) drank either green or oolong tea; only 4.8 percent added milk to their tea on a regular basis.

Habitual tea drinkers tended to be male, were about two years younger than non-habitual drinkers, and had higher educational levels. Interestingly, habitual tea drinkers were also considered more generally and centrally obese, than non-drinkers, and smoked more, consumed more alcohol, ate fewer vegetables, and had more frequent high sodium intake than those who did not drink tea regularly.

Despite these findings, the investigators were surprised to find that after adjusting for all of the lifestyle factors, regular tea drinkers still had lower systolic and diastolic blood pressure levels (SBP and DBP) compared to non-tea drinkers. Those who drank larger amounts of tea for longer periods of time had the lowest blood pressure readings of any group. The adjusted mean SBP and DBP values were lowest among the subjects who drank 600 milliliters/day or more, or those who drank for 10 years or more, compared with the other two subgroups, the authors noted. Although the differences in SBP and DBP were small, these could be significant on a population-wide basis.





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