Written by Chanel M. contributed by Kyle J. Norton, All right reserve
Wuyi Cliff Oolong tea, the best of Oolong and 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
a. In the experience of Acute administration of oolong tea decreases blood glucose levels of the study of "High oolong tea consumption predicts future risk of diabetes among Japanese male workers: a prospective cohort study" by Hayashino Y, Fukuhara S, Okamura T, Tanaka T, Ueshima H; HIPOP-OHP Research Group.[3a] reasearchers found that drank one cup of oolong tea per day and 1.64 (95% CI 1.11-2.40) for those drinking two or more cups per day. Fasting blood glucose increment per year was 0.11 mmol/l (95% CI 0.09-0.12 mmol/l), 0.12 mmol/l (95% CI 0.09-0.15 mmol/l) and 0.15 mmol/l (95% CI 0.11-0.18 mmol/l), respectively, for oolong tea consumption of 0, 1 and ≥ 2 cups/day, with a significant linear trend (P < 0.0001) and suggested that Long-term consumption of oolong tea may be a predictive factor for new onset diabetes. Further studies are necessary to elucidate the role of oolong tea in the risk of developing diabetes.
b. In the determination of Oolong tea and healthy adults glucose metabolism of the study of "Oolong tea does not improve glucose metabolism in non-diabetic adults" by Baer DJ, Novotny JA, Harris GK, Stote K, Clevidence B, Rumpler WV.[3b], researchers found that there are No significant differences were detected for fasting plasma glucose, fasting serum insulin, incremental plasma glucose area under the concentration time curve (AUC), total plasma glucose AUC or total serum insulin AUC and suggested that Neither oolong tea nor oolong tea supplemented with catechins or other polyphenols produced improved glucose metabolism in healthy adult volunteers on the basis of this highly controlled dietary intervention trial.
c. In the testing of extract of green and black tea and type II diabetes of the study of "The effect of an extract of green and black tea on glucose control in adults with type 2 diabetes mellitus: double-blind randomized study" by Mackenzie T, Leary L, Brooks WB.[3c], researchers found that The changes were not significantly different between study arms. We did not find a hypoglycemic effect of extract of green and black tea in adults with type 2 diabetes mellitus.
d. In the testing of Oolong tea effects in type II diabetes" of the study of "Antihyperglycemic effect of oolong tea in type 2 diabetes" by Hosoda K, Wang MF, Liao ML, Chuang CK, Iha M, Clevidence B, Yamamoto S.[3d], researchers found that oolong tea markedly lowered concentrations of plasma glucose (from 229 +/- 53.9 to 162.2 +/- 29.7 mg/dl, P < 0.001) and fructosamine (from 409.9 +/- 96.1 to 323.3 +/- 56.4 micromol/l, P < 0.01), whereas the water control group had not changed (208.7 +/- 61.0 vs. 232.3 +/- 63.1 mg/dl for glucose and from 368.4 +/- 85.0 to 340.0 +/- 76.1 micromol/l for fructosamine) and suggested that Oolong tea may be an effective adjunct to oral hypoglycemic agents in the treatment of type 2 diabetes
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