The Fifth International Scientific Symposium was supported by the American Cancer Society, the American College of Nutrition, the American Institute for Cancer Research, the American Medical Women's Association, the American Society for Nutrition, the Linus Pauling Institute, the University of Western Australia, and the Unilever Food and Health Research Institute.
"The most recent research suggests that consuming tea as it was intended—as a beverage—was the best way to help ensure tea would impart the most health benefits. Supplements of specific catechins may have a particular benefit but lack the total spectrum of advantages that the beverage contains. Hundreds of thousands of bioactive elements are found within tea’s leaves and together, they work synergistically to impact virtually every cell in the human body—from the heart, bones, brain, skin, and gastrointestinal tract.
Research suggests tea can help reduce the risk of the most common chronic diseases associated with aging including heart disease, cancer, obesity, neurological decline, cognition and osteoporosis.
New research is also evaluating the health benefits of the process of brewing and enjoying tea and whether that also improves health." Source: Fifth International Scientific Symposium
Will tea help with weight loss?
Yes and maybe.
An a meta-analyses including six published tea research studies, 24-hour energy expenditure increased with a catechin-caffeine mixture by 4.7% or 102 calories over 24 hours and fat oxidation increased during the same period, revealing that tea may aid weight loss.
Hursel, R., Viechtbauer, W., Dulloo, A. G., Tremblay, A., Tappy, L., Rumpler, W. and Westerterp-Plantenga, M. S. (2011), The effects of catechin rich teas and caffeine on energy expenditure and fat oxidation: a meta-analysis. Obesity Reviews, 12: e573–e581. doi: 10.1111/j.1467-789X.2011.00862.x
In a meta-analyses of 11 published clinical studies, catechins or epigallocatechin gallate (EGCG)-caffeine mixture have a modest positive effect on weight loss and weight maintenance. Hursel R. Viechtbauer W. Westerterp-Plantenga MS. The effects of green tea on weight loss.
CONCLUSIONS from "The effects of green tea on weight loss": Catechins or an epigallocatechin gallate (EGCG)-caffeine mixture have a small positive effect on WL and WM. The results suggest that habitual caffeine intake and ethnicity may be moderators, as they may influence the effect of catechins.
Citation: Al-salafe R, Irshad M, Abdulghani HM. Does Green Tea Help to Fight against Obesity? An Overview of the Epidemiological Reports. Austin J Clin Med. 2014;1(3): 11. Austin J Clin Med - Volume 1 Issue 3 - 2014
Positively yes! The studies referencing the positive effects of tea upon heart health are impressive and lengthy. It is well worth the diligence to read the articles and their associated references. Most studies are without reference to the sponsor however Unilever Lipton sponsored one of the more comprehensive studies.
Tea consumption improves endothelial function by increasing nitric oxide bioavailability and enhancing vasorelaxation. Tea catechins, epigallocatechin-3-gallate and epicatechin, provided at concentrations achievable in human tissues, relaxed blood vessel tone of isolated arterial walls in an animal model.
Tea, flavonoids, and cardiovascular health: endothelial protection The American Journal of Clinical Nutrition First published October 30, 2013, doi: 10.3945/ajcn.113.058313 Am J Clin Nutr December 2013 vol. 98 no. 6 1660S-1666S
Davide Grassi, Giovambattista Desideri, Paolo Di Giosia, Martina De Feo, Emanuela Fellini, Paola Cheli, Livia Ferri, and Claudio Ferri
A meta-analysis of 10 cohort and 7 case control studies revealed that 3 cups per day of tea is associated with a 11 percent reduction in risk of myocardial infarction.
Green and Black Tea Consumption and Risk of Stroke - A Meta-Analysis from UCLA’s School of Medicine, Los Angeles, Calif.
In a randomized, double blind, placebo controlled study of 19 males, daily black tea increased flow mediated dilation (FMD) from an average of 7.8% to up to 10.3%, depending upon flavonoid dosages. The flavonoids in as little as one cup of tea (about 100 mg flavonoids) were found to improve FMD. Black tea decreased systolic blood pressure by -2.6 mm/Hg and diastolic by -2.2 mm/Hg.
Grassi D, Mulder TP, Draijer R, et al. Black tea consumption dose-dependently improves flow-mediated dilation in healthy males - j. Hypertens. 2009, 27:774-781