05/13/2002 By Elda Hauschildt
Drinking tea regularly, especially for longer than 10 years, improves bone mineral density (BMD) in adults.
Benefits relate to total body BMD and BMD in the lumbar spine and hip regions.
Taiwanese researchers enrolled 497 men and 540 women, 30 years old or older, in a study of the effects of three kinds of tea: green, black and oolong. Participants answered questions about tea consumption and other life factors, such as physical activity, smoking, alcohol use, coffee and milk consumption and calcium supplementation.
The investigators, from Cheng Kung University Hospital in Tainan, did medical histories of participants and used dual energy x-ray absorptiometry to measure total body BMD and at the lumbar spine, hip neck and Ward triangle regions.
“We also demonstrated that younger men, those with higher body mass indexes and those who expend higher total physical activity have higher BMDs,” they say. “Even after adjustment for menopausal status, tea consumption was still an independent factor for BMD in women.”
The researchers concluded that the duration of tea consumption, not the amount of daily tea consumption, was the only independent determinant of BMD. “As we know, the change in BMD is always gradual,” they point out. “If BMD could be affected by tea consumption, the exposure must be long enough to have a significant cumulative effect on BMD.”
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