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Beschermend effect van (groene of oolong)thee op hoge bloeddruk*
Zij die minimaal 1 jaar lang 1 kop thee, groene of oolong,
per dag drinken hebben 46% minder kans op hoge bloeddruk. Zij die 2 tot 4
koppen per dag drinken wel 65% minder kans.
The Protective Effect of
Habitual Tea Consumption on Hypertension
Yi-Ching Yang, MD, MPH;
Feng-Hwa Lu, MD, MS; Jin-Shang Wu, MD; Chih-Hsing Wu, MD; Chih-Jen Chang, MD
Arch Intern Med. 2004;164:1534-1540.
Background Tea has long
been believed to possess hypotensive effects in popular Chinese
medicine. However, conflicting results have been shown among human
trials and animal studies on the relation between tea consumption
and blood pressure. Epidemiological evidence about the long-term
effect of tea on hypertensive risk is also inconsistent.
Methods We examined the
effect of tea drinking, measured in detail for the past decades, on
the risk of newly diagnosed hypertension in 1507 subjects (711 men
and 796 women), 20 years or older, who did not have a hypertensive
history during 1996 in Taiwan.
Results Six hundred
subjects (39.8%) were habitual tea drinkers, defined by tea
consumption of 120 mL/d or more for at least 1 year. Compared with
nonhabitual tea drinkers, the risk of developing hypertension
decreased by 46% for those who drank 120 to 599 mL/d and was
further reduced by 65% for those who drank 600 mL/d or more after
carefully 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). However, tea
consumption for more than 1 year was not associated with a further
reduction of hypertension risk.
Conclusion Habitual
moderate strength green or oolong tea consumption, 120 mL/d or more
for 1 year, significantly reduces the risk of developing
hypertension in the Chinese population. (juli 2004)