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Green tea may help fight glaucoma | Green tea contains healthful substances that can penetrate eye tissues, raising the possibility that the tea may protect against glaucoma and other eye diseases, say researchers.
Scientists have confirmed the benefits of green tea in ACS's bi-weekly Journal
of Agricultural and Food Chemistry. Chi Pui Pang and colleagues point out that
so-called green tea "catechins" have been among a number of antioxidants thought
capable of protecting the eye. Those include vitamin C, vitamin E, lutein, and
zeaxanthin. Until now, however, nobody knew if the catechins in green tea actually
passed from the stomach and gastrointestinal tract into the tissues of the eye.
Pang and his colleagues resolved that uncertainty in experiments with laboratory
rats that drank green tea. Analysis of eye tissues showed beyond a doubt that
eye structures absorbed significant amounts of individual catechins. The retina,
for example, absorbed the highest levels of gallocatechin, while the aqueous humor
tended to absorb epigallocatechin. The effects of green tea catechins in reducing
harmful oxidative stress in the eye lasted for up to 20 hours. "Our results indicate
that green tea consumption could benefit the eye against oxidative stress," the
report concludes. |
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