By Greg Arnold, DC, CSCS, March 5, 2009, abstracted from “Green and Black Tea Consumption and Risk of Stroke. A Meta-Analysis” printed online February 20, 2009 in Stroke
In the United States alone, someone has a stroke every 45 seconds and someone dies of stroke every 3 minutes. As the number 3 cause of death among Americans (cancer and heart disease are the leading causes), stroke costs our healthcare system $57 billion each year (1). The cost of stroke between 2005 and 2050 in the United States is estimated to exceed $2 trillion (2).
Supplements that have been found to help maintain a healthy heart include vitamin D (3) B-vitamins (4) like folic acid (5), and calcium (6). Now a new study (7) has found that tea, known to help with bone health in women (8), oral health (9), stress (10), colon health (11) and breast cell health (12), may also help with heart health.
The Tea Council estimates that on any given day, about 50% of Americans drink tea, with the greatest concentration of drinkers in the South and Northeast. Tea sales in the U.S. doubled between 1990 ($1.8 billion) and 1994 ($3.75 billion) (13). In 2002, Americans drank 0.2 kg of tea per person per year, while those in the United Kingdom were #1 in tea consumption, drinking 2.3 kg of tea per person per year (14).
In the study, researchers analyzed data from 9 studies involving almost 195,000 people who suffered 4,378 strokes. They found that those who consumed 3 or more cups of green or black tea per day had a 21% lower risk of stroke than those consuming 1 or fewer cups per day.
The researchers cite that there may be no difference between green and black tea consumption in regards to heart health because both green and black tea have been shown to benefit blood vessel health (15). Although the types of catechins differ between green and black tea, their total amounts are comparable because both black and green tea are derived from the same source, which are the catechins produced within the Camelia sinensis plant (16).
While admitting that “a randomized clinical trial would be necessary to confirm” the heart-healthy effects and green and black tea consumption in regards to stroke, the researchers concluded that “daily consumption of either green or black tea equaling 3 cups per day could prevent the onset of ischemic stroke.”
Greg Arnold is a Chiropractic Physician practicing in Danville, CA. You can contact Dr. Arnold directly by emailing him at mailto:PitchingDoc@msn.com or visiting his web site at www.CompleteChiropracticHealthcare.com
1. “Impact of Stroke” posted on the American Stroke Association Website www.strokeassociation.org/presenter.jhtml?identifier=1033
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7. Lenore Arab, Weiqing Liu, and David Elashoff. Green and Black Tea Consumption and Risk of Stroke. A Meta-Analysis. Stroke published February 19, 2009, 10.1161/STROKEAHA.108.538470
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9. Krishnan, R. and G. B. Maru (2005). "Inhibitory effect(s) of polymeric black tea polyphenols on the formation of B(a)P-derived DNA adducts in mouse skin." J Environ Pathol Toxicol Oncol 24(2): 79-90
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11. Yong G. Prospective Cohort Study of Green Tea Consumption and Colorectal Cancer Risk in Women. Cancer Epidemiol Biomarkers Prev 2007 16: 1219-1223 doi: 10.1158/1055-9965.EPI-07-0097
12. 12. Shrubsole M. Drinking Green Tea Modestly Reduces Breast Cancer Risk J. Nutr. 2009 139: 310-316.
13. “Tea: A Story of Serendipity” posted on the FDA website
15. Jochmann N, Lorenz M, von Krosigk1 A, Martus P, Boehm V, Baumann G, Stangl K, Stangl V. The efficacy of black tea in ameliorating endothelial function is equivalent to that of green tea. Br J Nutr. 2008;99: 863–868.
16. Alca´zar A, Ballesteros O, Jurado JM, Pablos F, Martín MJ, Vilches JL, Navalo´n A. Differentiation of green, white, black, Oolong, and Pu-erh teas according to their free amino acids content. J Agric Food Chem. 2007;55:5960 –5965.
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