A. Health Benefits
1. Antidepressant Properties
In the observation of the effects of Green tea consumption and psychological distress of the study of "Green tea consumption is associated with lower psychological distress in a general population: the Ohsaki Cohort 2006 Study" by Atsushi Hozawa, Shinichi Kuriyama,Naoki Nakaya, Kaori Ohmori-Matsuda, Masako Kakizaki, Toshimasa Sone, Masato Nagai, Yumi Sugawara, Akemi Nitta, Yasutake Tomata,Kaijun Niu, and Ichiro Tsuji, researchers found that The odds ratio (with 95% CI) of developing psychological distress among respondents who consumed ≥5 cups of green tea/d was 0.80 (0.70, 0.91) compared with those who consumed <1 cup/d and concluded that Green tea consumption was inversely associated with psychological distress even after adjustment for possible confounding factors(1).
2. External Anogenital Warts
In the investigation of green tea catechins and external anogenital warts of the study of "Efficacy, safety and tolerability of green tea catechins in the treatment of external anogenital warts: a systematic review and meta-analysis" by Tzellos TG, Sardeli C, Lallas A, Papazisis G, Chourdakis M, Kouvelas D., researchers found that the efficacy of Polyphenon 15% and 10%, at least for the primary endpoint, is clearly indicated. Polyphenon E treatment exhibits very low recurrence rates and appears to have a rather favourable safety and tolerability profile(2).
3. Obstructive Sleep Apnea-Related Brain Deficits
In the investigation of "Green Tea Compounds Beat OSA-Related Brain Deficits" by American Thoracic Society (ATS), researchers indicated that GTP-treated rats exposed to IH displayed significantly greater spatial bias for the previous hidden platform position, indicating that GTPs are capable of attenuating IH-induced spatial learning deficits," wrote Dr. Gozal, adding that GTPs "may represent a potential interventional strategy for patients" with sleep-disordered breathing(3).
4. Bad Breath
5. Human immunodeficiency virus (HIV)
6. Mental Alertness
In the evaluation of drinking green tea brings relaxation of the study of "L-theanine—a unique amino acid of green tea and its relaxation effect in humans" by Lekh Raj Juneja, Djong-Chi Chu, Tsutomu Okubo, Yukiko Nagato, Hidehiko Yokogoshi, researchers found that L-theanine administered intraperitoneally to rats reached the brain within 30 min without any metabolic change.
7. Gastrointestinal diseases
In the evaluation of different doses of green tea extract and inflammatory bowel disease of the study of "Comparative evaluation of different doses of green tea extract alone and in combination with sulfasalazine in experimentally induced inflammatory bowel diseasein rats" by Byrav DS, Medhi B, Vaiphei K, Chakrabarti A, Khanduja KL.(7), researchers showed that green tea alone and in combination with sulfasalazine reduced inflammatory changes induced by tri nitro benzene sulfonic acid in rats(7).
8. Immune system
In the investigation of the immunomodulatory effects of decaffeinated green tea extract in rain bow of the study of "Immunomodulatory effects of decaffeinated green tea (Camellia sinensis) on the immune systemof rainbow trout (Oncorhynchus mykiss)" by Sheikhzadeh N, Nofouzi K, Delazar A, Oushani AK., researchers found that showed that decaffeinated green tea in lower doses of administration could be optimum to enhance the immunity of rainbow trout(8).
9. Antimicrobial activities
In the investigation of Antimicrobial activities of green of the study of "Antimicrobial activities of tea catechins and theaflavins and teaextracts against Bacillus cereus" by Friedman M, Henika PR, Levin CE, Mandrell RE, Kozukue N., researchers found that flavonoids in green tea has exerted its ability in protective effects against Bacillus cereus(9).
10. Periodontal Health
11. Congitive Activities
In the evaluation of the effect of tea polyphenol (TP) on cognitive and anti-cholinesterase activity of the study of "Effects of green tea polyphenol on cognitive and acetylcholinesterase activities" by Kim HK, Kim M, Kim S, Kim M, Chung JH. researchers found that TP exhibited a dramatic inhibitory effect on acetylcholinesterase activity. This finding suggests that TP might be useful in the treatment of Alzheimer's disease(11).
12. Neurodegernative diseases
In the investigation of theaflavin-enriched green tea extract in association with cholesterol levels of the study of "Cholesterol-lowering effect of a theaflavin-enriched green tea extract: a randomized controlled trial" by Maron DJ, Lu GP, Cai NS, Wu ZG, Li YH, Chen H, Zhu JQ, Jin XJ, Wouters BC, Zhao J., researchers found that The theaflavin-enriched green tea extract is an effective adjunct to a low-saturated-fat diet to reduce LDL-C in hypercholesterolemic adults and is well tolerated(13).
In the examination of Osteoporosis and the effects of green tea of the study of "Green tea and bone metabolism' by Shen CL, Yeh JK, Cao JJ, Wang JS., researchers found that , tea and its bioactive components might decrease the risk of fracture by improving bone mineral density and supporting osteoblastic activities while suppressing osteoclastic activities(14).
In the investigation of Green tea and Arthritis of the study of "Green teapolyphenol epigallocatechin 3-gallate in arthritis" by Ahmed S., researcher indicated that although these findings provide scientific evidence of the anti-rheumatic activity of EGCG, further preclinical studies are warranted before phase clinical trials could be initiated with confidence for patients with joint diseases(15).
17. Antioxidant Activity
In the investigation of l-Theanine is a unique amino acid in green tea effects on ethanol-induced liver injury of the study of "l-Theanine prevents alcoholic liver injury through enhancing the antioxidantcapability of hepatocytes" by Li G, Ye Y, Kang J, Yao X, Zhang Y, Jiang W, Gao M, Dai Y, Xin Y, Wang Q, Yin Z, Luo L. researchers found that l-theanine significantly inhibited ethanol-induced reduction of mouse antioxidant capability which included the activities of SOD, CAT and GR, and level of GSH. These results indicated that l-theanine prevented ethanol-induced liver injury through enhancing hepatocyte antioxidantabilities(17).
19. Weight Loss
In the meta-analysis whether green tea indeed has a function in body weight regulation of the study of "The effects of green tea on weight loss and weight maintenance: a meta-analysis" by Hursel R, Viechtbauer W, Westerterp-Plantenga MS., researchers found that Catechins or an epigallocatechin gallate (EGCG)-caffeine mixture have a small positive effect on WL(weight loss) and WM(weight management) and suggested that habitual caffeine intake and ethnicity may be moderators, as they may influence the effect of catechins(19).
B. Side effects
Intake of green tea high concentration extract may induce risks of liver damage(20), the potential to interact with prescription drugs to alter their therapeutic efficacy(20), and the chance to cause harm when combined with other highly popular herbal remedies(20).
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Kyle J. Norton (Scholar, Master of Nutrition, All right reserved)
Health article writer and researcher; Over 10.000 articles and research papers have been written and published on line, including world wide health, ezine articles, article base, healthblogs, selfgrowth, best before it's news, the karate GB daily, etc.,.
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Nominated for shorty award over last 4 years
Some articles have been used as references in medical research, such as international journal Pharma and Bio science, ISSN 0975-6299.
(20) Adverse effects of concentrated green tea extracts by Schönthal AH1.