Written by Chanel M. contributed by Kyle J. Norton, All right reserve
Wuyi Cliff Oolong tea, the best of Oolong, one of 3 ingredients of Tava Tea, is a species of Camellia sinensis belonging to the family Theaceae, native the Wuyi Mountain area. Its leaves and leaf buds has been used as tea in Chinese culture and many places in the world, including Wuyi Rock Tea, Tie Guan Yin tea, Taiwan tea and oolong tea, Iron Goddess of Mercy and other products in Fujian, etc.. Oolong can be bought as green or black tea but it is best known as a black tea in the process of withering under the strong sun and oxidation before curling and twisting.
Health benefits of Oolong tea
1. Cardiovascular disease
a. In an examination of the relationship between the consumption of these beverages and risk of mortality from CVD, 76,979 individuals aged 40-79 years free of stroke, coronary heart disease (CHD) and cancer of the study of "Coffee, green tea, black tea and oolong tea consumption and risk of mortality from cardiovascular disease in Japanese men and women" Mineharu Y, Koizumi A, Wada Y, Iso H, Watanabe Y, Date C, Yamamoto A, Kikuchi S, Inaba Y, Toyoshima H, Kondo T, Tamakoshi A; JACC study Group.[1a], researchers found that risk reduction for total CVD across categories of caffeine intake was most prominently observed in the second highest quintile, with a 38% lower risk among men and 22% among women as consumption of coffee, green tea and oolong tea and total caffeine intake was associated with a reduced risk of mortality from CVD.
b. Ischemic stroke
In the determination of consumption may reduce the risk of ischemic stroke, available epidemiological evidence is equivocal, mainly due to the lack of accurate measurements on tea exposure of the study of "Tea consumption and ischemic stroke risk: a case-control study in southern China" by Liang W, Lee AH, Binns CW, Huang R, Hu D, Zhou Q.[1b], researchers found that Significant inverse dose-response relationships were also found for years of drinking and the amount of dried tea leaves brewed. The adjusted ORs for the highest level of consumption in terms of frequency of intake, duration of drinking, and average tea leaves brewed were 0.61 (95% CI, 0.40 to 0.94), 0.40 (95% CI, 0.25 to 0.64), and 0.27 (95% CI, 0.16 to 0.46), respectively and suggested that Long-term tea consumption is associated with reduced risk of ischemic stroke.
c. Hypertension
In the examination of Oolong tea suppressed renal sympathetic nerve activity (RSNA) and blood pressure (BP) of the study of "Effects of oolong tea on renal sympathetic nerve activity and spontaneous hypertension in rats" by Tanida M, Tsuruoka N, Shen J, Kiso Y, Nagai K. [1c]researchers found that Oolong Tea may exert its hypotensive action through changes in autonomic neurotransmission via an afferent neural mechanism
d. Coronary artery disease
In the experiment of Plasma adiponectin levels are reduced in obesity, in patients with type 2 diabetes mellitus and in coronary artery disease (CAD) of the study of "Oolong tea increases plasma adiponectin levels and low-density lipoprotein particle size in patients with coronary artery disease" by Shimada K, Kawarabayashi T, Tanaka A, Fukuda D, Nakamura Y, Yoshiyama M, Takeuchi K, Sawaki T, Hosoda K, Yoshikawa J.[1d], researcher found that there was a significant difference in plasma adiponectin levels before and after 1 month intake of Oolong tea (6.26 +/- 3.26 microg/ml), plasma level LDL particle size (25.02+/-0.67 nm) and suggested that Oolong tea may have beneficial effects on the progression of atherosclerosis in patients with CAD
e. Etc.
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Sources
[1a] http://www.ncbi.nlm.nih.gov/pubmed/19996359
[1b] http://www.ncbi.nlm.nih.gov/pubmed/19478218
[1c] http://www.ncbi.nlm.nih.gov/pubmed/18328356
[1d] http://www.ncbi.nlm.nih.gov/pubmed/15331202
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