Tea without milk increases anti-oxidants

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Hi All, The abstract of a paper on Consumption.txt is on tea effects on

antioxidants is attached and a PDF is available. They drank tea from six

tea bags a day. The effects were large and the milk reduced effects. It

was reduced fat milk.

Cheers, Al.

Alan Pater, Ph.D.; Faculty of Medicine; Memorial University; St. 's, NF

A1B 3V6 Canada; Tel. No.: (709) 777-6488; Fax No.: (709) 777-7010; email:

apater@...

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Title: Consumption of black tea elicits an increase in plasma

antioxidant potential in humans

Author(s): Simon C. Langley-

Source: International Journal of Food Sciences and Nutrition

Volume: 51 Number: 5 Page: 309 -- 315

DOI: 10.1080/096374800426902

Publisher: & Francis Health Sciences

Abstract: Epidemiological studies suggest that the consumption of tea

flavonoids may be associated with reduced risk of coronary heart

disease, stroke and cancer-related deaths. The flavonoids are

polyphenols which in vitro exhibit antioxidant properties. Tea

flavonoids are known to be rapidly absorbed into the circulation

following oral ingestion. To date few studies have demonstrated that

these bioavailable flavonoids retain antioxidant properties in vivo.

Nine healthy subjects aged between 26 and 59 (one male and eight

females) took part in 3 study days. On 1 day subjects consumed no tea

and on the other 2 days subjects drank either black tea with milk, or

black tea alone at hourly intervals between 9.00 a.m. and 14.00 p.m.

Blood was sampled at 9.00 a.m. and at 12.00 p.m. and 15.00 p.m. The

antioxidant potential of plasma was determined using the ferric

reducing antioxidant power (FRAP) assay. Subjects consuming no tea

exhibited no significant change in FRAP across the 6 hours of the

study day. Similarly consumption of milky tea produced no change in

FRAP between 9.00 a.m. and 12.00 p.m. and the 50% increase in FRAP

noted between 12.00 p.m. and 15.00 p.m. was not statistically

significant. When the subjects consumed black tea without milk FRAP

increased by 65% between 9.00 a.m. and 12.00 p.m. (P = 0.02) and at

15.00 p.m. was 76% higher than at 9.00 a.m. (P = 0.002). Heavy

consumption of black tea thus appears to elevate circulating

antioxidant potentials in vivo. This is an effect which appears to be

totally negated by the drinking of tea with milk. Although tea may

thus represent an important source of dietary antioxidants in many

societies, the role of tea in reducing risk of major disease states

needs to be investigated in more detail.

Reference Links: 17 (View Links)

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