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Encyclopedia > Green tea
Green tea leaves steeping in an uncovered gaiwan
Green tea leaves steeping in an uncovered gaiwan

Green tea (simplified Chinese: 绿; traditional Chinese: ; pinyin: lǜchá; Japanese: 緑茶; ryokucha) is a "true" tea, meaning it is made solely with the leaves of Camellia sinensis, that has undergone minimal oxidation during processing. Green tea originates from China and has become associated with many cultures in Asia from Japan to the Middle East. Recently, it has become more widespread in the West, where black tea is traditionally consumed. Many varieties of green tea have been created in countries where it is grown that can differ substantially due to variable growing conditions, processing and harvesting time. Over the last few decades green tea has begun to be subjected to many scientific and medical studies to determine the extent of its long-purported health benefits, with some evidence suggesting regular green tea drinkers may have lower chances of heart disease[citation needed] and developing certain types of cancer[1]. Image File history File links Download high resolution version (1125x1500, 183 KB) Summary en: Green tea leaves steeping in an uncovered zhong (type of tea cup). ... Image File history File links Download high resolution version (1125x1500, 183 KB) Summary en: Green tea leaves steeping in an uncovered zhong (type of tea cup). ... A gaiwan (lit. ... Green Tea (Simplified Chinese: ; Traditional Chinese: ; pinyin: ) is a 2003 Chinese film about a conservative college student (Zhao Wei) who goes on a series of blind dates, not taking them seriously and often leaving halfway through. ... Simplified Chinese character (Simplified Chinese: or ; traditional Chinese: or ; pinyin: or ) is one of two standard sets of Chinese characters of the contemporary Chinese written language. ... Traditional Chinese characters refers to one of two standard sets of printed Chinese characters. ... Pinyin, more formally called Hanyu Pinyin (Simplified Chinese: ; Traditional Chinese: ; Pinyin: ), is the most common variant of Standard Mandarin romanization system in use. ... For other uses, see Tea (disambiguation). ... Binomial name (L.) Kuntze Camellia sinensis is the tea plant, the plant species whose leaves and leaf buds are used to produce tea. ... The most fundamental reactions in chemistry are the redox processes. ... For other uses, see Asia (disambiguation). ... A map showing countries commonly considered to be part of the Middle East The Middle East is a region comprising the lands around the southern and eastern parts of the Mediterranean Sea, a territory that extends from the eastern Mediterranean Sea to the Persian Gulf. ... A compass rose with west highlighted This article refers to the cardinal direction; for other uses see West (disambiguation). ... Black tea Black tea is more oxidized than the green, oolong and white varieties; all four varieties are made from leaves of Camellia sinensis. ...

Contents

Chinese green teas

An example of a slightly higher grade of Chinese green tea, called Mao Jian.
An example of a slightly higher grade of Chinese green tea, called Mao Jian.
A pile of the Twinings brand gunpowder tea, a variety of Chinese green tea
A pile of the Twinings brand gunpowder tea, a variety of Chinese green tea

Image File history File links Chinese green tea/ Chinesischer grüner Tee/ 中国绿茶 Maojian/ 毛尖 own foto File links The following pages link to this file: Green tea ... Image File history File links Chinese green tea/ Chinesischer grüner Tee/ 中国绿茶 Maojian/ 毛尖 own foto File links The following pages link to this file: Green tea ... Xin Yang Mao Jian tea (信阳瓜尖) is a Green tea from Henan designated as a China Famous Tea. ... Twinings is a brand of tea, primarily operating in the United Kingdom. ... Gunpowder tea (珠茶; pinyin: zhū chá) is a form of green Chinese tea produced in Zhejiang Province of China in which each leaf has been rolled into a small round pellet. ...

Zhejiang Province

Zhejiang is home to the most famous of all teas, Xi Hu Longjing, as well as many other high-quality green teas. Zhejiang (also spelled Chehkiang or Chekiang) is an eastern coastal province of the Peoples Republic of China. ...

Longjing
The most well-known of famous Chinese teas from Hangzhou, its name in Chinese means dragon well. It is pan-fried and has a distinctive flat appearance. Falsification of Longjing is very common, and most of the tea on the market is in fact produced in Sichuan Province[citation needed] and hence not authentic Longjing.
Hui Ming
Named after a temple in Zhejiang.
Long Ding
A tea from Kaihua County known as Dragon Mountain.
Hua Ding
A tea from Tiantai County and named after a peak in the Tiantai mountain range.
Qing Ding
A tea from Tian Mu, also known as Green Top.
Gunpowder
A popular tea also known as zhuchá. It originated in Zhejiang but is now grown elsewhere in China.

Longjing tea (Simplified Chinese: ; Traditional Chinese: ; Pinyin: ) is a famous variety of green tea from Hangzhou, Zhejiang Province, China where it is produced mostly by hand and has been renowned for its high quality, earning the China Famous Tea title. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ...   (Chinese: ; pinyin: ; Postal map spelling: Hangchow) is a sub-provincial city located in the Yangtze River Delta in the Peoples Republic of China, and the capital of Zhejiang province. ...   (Chinese: ; pinyin: ; Wade-Giles: SzÅ­4-chuan1; Postal map spelling: Szechwan and Szechuan) is a province in the central-western China with its capital at Chengdu. ... Zhejiang (also spelled Chehkiang or Chekiang) is an eastern coastal province of the Peoples Republic of China. ... Gunpowder tea (珠茶; pinyin: zhÅ« chá) is a form of green Chinese tea produced in Zhejiang Province of China in which each leaf has been rolled into a small round pellet. ... Zhejiang (also spelled Chehkiang or Chekiang) is an eastern coastal province of the Peoples Republic of China. ...

Jiangsu Province

A plate of Bi Luo Chun tea, from Jiangsu Province in China.
A plate of Bi Luo Chun tea, from Jiangsu Province in China.
Bi Luo Chun
A Chinese famous tea also known as Green Snail Spring, from Dong Ting. As with Longjing, falsification is common and most of the tea marketed under this name may, in fact, be grown in Sichuan.
Rain Flower
A tea from Nanjing.
Shui Xi Cui Bo

Bi Luo Chun is a famous green tea originally grown in the Dong Ting mountain of Tai Hu, Jiangsu Province, China. ... Bi Luo Chun is a famous green tea originally grown in the Dong Ting mountain of Tai Hu, Jiangsu Province, China. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ... Longjing is a famous variety of green tea from Hangzhou, Zhejiang Province, China where it is produced mostly by hand and has been renowned for its high quality. ...   (Chinese: ; pinyin: ; Wade-Giles: SzÅ­4-chuan1; Postal map spelling: Szechwan and Szechuan) is a province in the central-western China with its capital at Chengdu. ... For other uses, see Nanjing (disambiguation). ...

Hubei Province

Yu Lu
A steamed tea known as Gyokuro (Jade Dew) made in the Japanese style.

Henan Province

Xin Yang Mao Jian
A Chinese famous tea also known as Green Tip, or Tippy Green.

Xin Yang Mao Jian tea (信阳瓜尖) is a Green tea from Henan designated as a China Famous Tea. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ...

Jiangxi Province

Chun Mee
Name means "precious eyebrows"; from Jiangxi, it is now grown elsewhere.
Gou Gu Nao
A well-known tea within China and recipient of numerous national awards.
Yun Wu
A tea also known as Cloud and Mist.

Chun Mee is a popular green tea. ... Categories: Anatomy stubs | Human appearance ...   (Chinese: ; pinyin: ; Wade-Giles: Chiang-hsi; Postal map spelling: Kiangsi) is a southern province of the Peoples Republic of China, spanning from the banks of the Yangtze River in the north into hillier areas in the south. ...

Anhui Province

Anhui Province is home to three Chinese famous teas. Anhui (Chinese: 安徽; Hanyu Pinyin: ; Wade-Giles: An-hui; Postal System Pinyin: Ngan-hui, Anhwei or An-hwei) is a province of the Peoples Republic of China. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ...

Da Fang
A tea from Mount Huangshan also known as Big Square.
Huangshan Mao Feng
A Chinese famous tea from Mount Huangshan.
Lu An Guapian
A Chinese famous tea also known as Melon Seed.
Hou Kui
A Chinese famous tea also known as Monkey tea.
Tun Lu
A tea from Tunxi District.
Huo Qing
A tea from Jing County, also known as Fire Green.
Hyson
A medium-quality tea from many provinces, an early-harvested tea.

Da Fang tea is grown at the south of Huangshan in Xi County of Anhui Province, it has similarities to Longjing and a nutty aroma. ... Huangshan 2002 Mount Huangshan is a mountain range in Anhui province in eastern China. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ... Huangshan 2002 Mount Huangshan is a mountain range in Anhui province in eastern China. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ... Hou Kui tea is grown at the foot Huangshan in Taiping County. ... China Famous Tea refers to a finite list of Chinese tea, thought different sources will cite slightly different teas, this is a list from Chinese Tea Culture Research Centre of the 10 famous teas. ... Tunxi District is a district in Anhui under the jurisdiction of Huangshan City. ... Jing County (泾县 Jīng Xiàn) is a county in Anhui under the jurisdiction of Xuancheng. ... A province, in the context of China, is a translation of Sheng (Chinese: 省 Shěng), which is an administrative division of China. ...

Japanese green teas

Japanese green tea
Japanese green tea
Genmaicha green tea
Genmaicha green tea

Green tea (緑茶; ryokucha) is so ubiquitous in Japan that it is more commonly known simply as "tea" (お茶; ocha) and even as "Japanese tea" (日本茶; nihoncha),although it was first used in China during the Song Dynasty, and brought to Japan by Myōan Eisai, a Japanese Buddhist priest who also introduced the Rinzai school of Zen Buddhism. Types of tea are commonly graded depending on the quality and the parts of the plant used as well as how they are processed. There are large variations in both price and quality within these broad categories, and there are many specialty green teas that fall outside this spectrum. The best Japanese green tea is said to be that from the Yame region of Fukuoka Prefecture and the Uji region of Kyoto. Shizuoka Prefecture(静岡県) crops 40% of raw tea leaf. Japanese Green Tea photography person : MASA photography day : February, 2005 photography place : home of MASA File links The following pages link to this file: Green tea Categories: GFDL images ... Japanese Green Tea photography person : MASA photography day : February, 2005 photography place : home of MASA File links The following pages link to this file: Green tea Categories: GFDL images ... Image File history File linksMetadata Size of this preview: 800 × 485 pixelsFull resolution (1024 × 621 pixel, file size: 127 KB, MIME type: image/jpeg) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Green tea Metadata This file contains... Image File history File linksMetadata Size of this preview: 800 × 485 pixelsFull resolution (1024 × 621 pixel, file size: 127 KB, MIME type: image/jpeg) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Green tea Metadata This file contains... Northern Song in 1111 AD Capital Bianjing (汴京) (960–1127) Linan (臨安) (1127–1276) Language(s) Chinese Religion Buddhism, Taoism, Confucianism Government Monarchy Emperor  - 960–976 Emperor Taizu  - 1126–1127 Emperor Qinzong  - 1127–1162 Emperor Gaozong  - 1278–1279 Emperor Bing History  - Zhao Kuangyin taking over the throne of the Later Zhou... Myōan Eisai, founder of the Rinzai School of Zen, 12th century. ... There is a disputed proposal that this article should be merged with Rinzai and Linji. ... For other uses, see Zen (disambiguation). ... Yame (八女市; -shi) is a city located in Fukuoka, Japan. ... Fukuoka Prefecture ) is located on KyÅ«shÅ« Island, Japan. ... Uji (Japanese: 宇治市; -shi) is a city on the southern outskirts of the city of Kyoto, on the Keihan line or the JR Nara Line towards Osaka. ... For other uses, see Kyoto (disambiguation). ... Shizuoka Prefecture ) is located in the ChÅ«bu region on HonshÅ« island, Japan. ...

玉露 Gyokuro (Jade Dew)
The highest grade Japanese green tea cultivated in special way. Gyokuro's name refers to the pale green color of the infusion. The leaves are grown in the shade before harvest, which alters their flavor. Gyokuro has a high caffeine content (Generally 0.16% in infusion[2]), but the significant L-Theanine content of Gyokuro slows down and counteracts the caffeine assimilation, and also the amount ingested is very small (Generally 10ml - 60ml).
抹茶 Matcha (rubbed tea)
A fine ground Ten-cha (碾茶: has very similar cultivation process as Gyokuro) used primarily in the tea ceremony. Matcha is also a popular flavor of ice cream and other sweets in Japan.
煎茶 Sencha (broiled tea)
The first and second flush of green tea, which is the most common green tea in Japan made from leaves that are exposed directly to sunlight. The first flush is also called Shin-cha (新茶: a new tea)
玄米茶 Genmaicha (Brown-Rice tea)
Bancha (sometimes Sencha) and roasted genmai (brown rice) blend. It is often mixed with a small amount of Matcha to make the colour better.
冠茶 Kabusecha (covered tea)
kabusecha is sencha tea, the leaves of which have grown in the shade prior to harvest, although not for as long as Gyokuro. It has a more delicate flavor than Sencha.
番茶 Bancha (common tea)
Sencha harvested as a third or fourth flush tea between summer and autumn. Aki-Bancha (autumn Bancha) is not made from entire leaves, but from the trimmed unnecessary twigs of the tea plant.
焙じ茶 Hōjicha (pan fried tea)
A strong roasted green tea.
茎茶 Kukicha (stalk tea)
A tea made from stalks produced by harvesting one bud and three leaves.
玉緑茶 Tamaryokucha
A tea that has a tangy, berry-like taste, with a long almondy aftertaste and a deep aroma with tones of citrus, grass, and berries.
Okinawan Tea

Gyokuro is a fine Green tea from Japan. ... L-theanine Whilst both tea and coffee contain the stimulant caffeine, tea drinking tends to have a more relaxing effect than coffee. ... Matcha IPA: ) is a fine, powdered green tea used particularly in Japanese tea ceremony, as well as to dye and flavour foods such as mochi and soba noodles, green tea ice cream and a variety of wagashi (Japanese confectionery). ... A tea ceremony is a ritualised form of making tea. ... Green tea ice cream for sale Green tea ice cream is an American ice cream flavor. ... Over three quarters of all tea produced in Japanese tea gardens is Sencha (煎茶), a tea selected for its pleasant sharpness and fresh qualities complementing a leaf of high uniformity and rich emerald color. ... Genmaicha is the Japanese name for green tea combined with roasted brown rice. ... Percentages are relative to US recommendations for adults. ... Unlike most Sencha cultivated in un-shaded gardens exposed to direct sunlight, Kabusecha Sencha requires shading tea plants a few weeks prior to harvest. ... Banchas meaning references the coarser grades and heavier, late season crop from which this full-flavored tea is made. ... Hōjicha ) is set apart from other Japanese green teas because it is roasted over charcoal. ... Kukicha is also called stick tea owing to the long thin shape of this leaf-stalk blend. ... A fine Japanese green tea that has a tangy, berry like taste, with a long almondy aftertaste and a deep aroma with tones of citrus, grass, and berries. ...

Other green teas

Ceylon (Sri Lanka) Green tea is produced using various methods of manufacture. ...

Brewing

Generally, 2.25 grams of tea per 6 ounces of water, or about one teaspoon of green tea per cup, should be used. With very high quality teas like gyokuro, more than this amount of leaf is used, and the leaf is steeped multiple times for short durations.


Green tea brewing time and temperature varies with individual teas. The hottest brewing temperatures are 180°F to 190°F (82°C to 88°C) water and the longest steeping times 2 to 3 minutes. The coolest brewing temperatures are 140°F to 150°F (60°C to 66°C) and the shortest times about 30 seconds. In general, lower quality green teas are steeped hotter and longer, while higher quality teas are steeped cooler and shorter. Steeping green tea too hot or too long will result in a bitter, astringent brew. High quality green teas can and usually are steeped multiple times; 2 or 3 steepings is typical.


Caffeine

Green teas have about a quarter the caffeine content, by liquid volume, of coffee.[citation needed] Green teas contain two caffeine metabolites (caffeine-like substances): theophylline, which is stronger than caffeine, and theobromine, which is slightly weaker than caffeine. For other uses, see Caffeine (disambiguation). ... Theophylline is a methylxanthine drug used in therapy for respiratory diseases such as COPD or asthma under a variety of brand names. ... For other uses, see Caffeine (disambiguation). ... Theobromine, also known as xantheose,[1] is a bitter alkaloid of the cacao plant. ...


Potential effects of green tea on health

Bai Hao Yin Zhen white tea Note: this page only deals with the effects of tea which is made from the plant Camellia sinensis (i. ...

History

There is archaeological evidence that suggests that tea has been consumed for almost 5000 years, with China and India being two of the first countries to cultivate it. Green tea has been used as traditional medicine in areas such as India, China, Japan and Thailand to help everything from controlling bleeding and helping heal wounds to regulating body temperature, blood sugar and promoting digestion.


The Kissa Yojoki (Book of Tea), written by Zen priest Eisai in 1191, describes how drinking green tea can have a positive effect on the five vital organs, especially the heart. The book discusses tea's medicinal qualities, which include easing the effects of alcohol, acting as a stimulant, curing blotchiness, quenching thirst, eliminating indigestion, curing beriberi disease, preventing fatigue, and improving urinary and brain function. Part One also explains the shapes of tea plants, tea flowers, and tea leaves, and covers how to grow tea plants and process tea leaves. In Part Two, the book discusses the specific dosage and method required for individual physical ailments. For other uses, see Zen (disambiguation). ... Myōan Eisai, founder of the Rinzai School of Zen, 12th century. ... // Events May 12 - Richard I of England marries Berengaria of Navarre. ... The heart and lungs, from an older edition of Grays Anatomy. ... This article does not cite any references or sources. ... Stimulants are drugs that temporarily increase alertness and wakefulness. ... Beriberi is a nervous system ailment caused by thiamine (vitamin B1) deficiency. ... The word fatigue is used in everyday living to describe a range of afflictions, varying from a general state of lethargy to a specific work induced burning sensation within muscle. ... The urinary system is a system of organs, tubes, muscles, and nerves that work together to create, store, and carry, urine. ... Human brain In animals, the brain (enkephale) (Greek for in the skull), is the control center of the central nervous system, responsible for behavior. ...


Unproven claims

Green tea has been credited with providing a wide variety of health benefits, many of which have not been validated by scientific evidence. These claims and any for which academic citations are currently missing are listed here:

  • Stopping certain neurodegenerative diseases such as Alzheimer's and Parkinson's.[2]
  • The prevention and treatment of cancer [3]
  • Treating multiple sclerosis [4]
  • Preventing the degradation of cell membranes by neutralizing the spread of free radicals which occur during oxidation process. [5]
  • Reducing the negative effects of LDL cholesterol (bad cholesterol) by lowering levels of triglycerides and increasing the production of HDL cholesterol (good cholesterol).
  • Increasing fat oxidation (helps the body use fat as an energy source) and raising metabolism. [6]
  • Joy Bauer, a New York City nutritionist, says [the catechins in green tea] increase levels of the metabolism speeding brain chemical norepinephrine (noradrenaline).
  • Japanese researchers claim that drinking five cups of green tea a day can burn 70 to 80 extra calories. Dr. Nicholas Perricone, an anti-aging specialist, appeared on the Oprah Winfrey show and told Oprah's viewers they can lose 10 lbs (4.5 kg) in 6 weeks drinking green tea instead of coffee.
  • Some green tea lovers commonly restrict their intake because of the caffeine it contains — about a quarter the amount as is found in coffee. Too much caffeine can cause nausea, insomnia, or frequent urination.[7]

Neurodegenerative disease (Greek νέυρο-, néuro-, nerval and Latin dēgenerāre, to decline or to worsen) is a condition in which cells of the brain and spinal cord are lost. ... Alzheimer redirects here. ... Parkinsons disease (PD; paralysis agitans) is a neurodegenerative disease of the substantia nigra (an area in the basal ganglia of the brain). ... Drawing of the structure of cork as it appeared under the microscope to Robert Hooke from Micrographia which is the origin of the word cell being used to describe the smallest unit of a living organism Cells in culture, stained for keratin (red) and DNA (green) The cell is the... Look up cell membrane in Wiktionary, the free dictionary. ... In chemistry, radicals (often referred to as free radicals) are atomic or molecular species with unpaired electrons on an otherwise open shell configuration. ... Low-density lipoprotein (LDL) refers to a class and range of lipoprotein particles, varying somewhat in their size and contents, which carry cholesterol in the blood and around the body, for use by various cells. ... HDL is an initialism that may refer to any of the following: High density lipoprotein Hardware description language german: Hab Dich Lieb This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... The most fundamental reactions in chemistry are the redox processes. ... Structure of the coenzyme adenosine triphosphate, a central intermediate in energy metabolism. ... For other uses, see Caffeine (disambiguation). ... For other uses, see Coffee (disambiguation). ... For other uses, see Nausea (disambiguation). ... This article is about the sleeping disorder. ... Polyuria is the passage of a large volume of urine in a given period. ...

United States Food and Drug Administration (FDA)

The article Tea: A Story of Serendipity[8] appeared in the March 1996 issue of FDA Consumer Magazine and looked at the potential benefits of green tea. At that time they had not done any reviews of the potential benefits of green tea and were waiting to do it until health claims were filed. They have since denied two petitions to make qualified health claims as to the health benefits of green tea. [9] The United States Food and Drug Administration is the government agency responsible for regulating food, dietary supplements, drugs, cosmetics, medical devices, biologics and blood products in the United States. ...


On June 30, 2005, in response to "Green Tea and Reduced Risk of Cancer Health Claim", they stated: "FDA concludes that there is no credible evidence to support qualified health claims for green tea consumption and a reduced risk of gastric, lung, colon/rectal, esophageal, pancreatic, ovarian, and combined cancers. Thus, FDA is denying these claims. However, FDA concludes that there is very limited credible evidence for qualified health claims specifically for green tea and breast cancer and for green tea and prostate cancer, provided that the qualified claims are appropriately worded so as to not mislead consumers." [10]


On May 9, 2006, in response to "Green Tea and Reduced Risk of Cardiovascular Disease", they concluded "there is no credible evidence to support qualified health claims for green tea or green tea extract and a reduction of a number of risk factors associated with CVD." [11]


However in October 2006, the FDA approved an ointment based on green tea. New Drug Application (NDA) number N021902, for kunecatechins ointment 15% (proprietary name Veregen) was approved on October 31, 2006 [12], and added to the "Prescription Drug Product List" in October 2006. [13] Kunecatechins ointment is indicated for the topical treatment of external genital and perianal warts. [14]


Scientific studies

According to research reported at the Sixth International Conference on Frontiers in Cancer Prevention, sponsored by the American Association for Cancer Research, a standardized green tea polyphenol preparation (Polyphenon E) limits the growth of colorectal tumors in rats treated with a substance that causes the cancer. "Our findings show that rats fed a diet containing Polyphenon E are less than half as likely to develop colon cancer," Dr. Hang Xiao, from the Ernest Mario School of Pharmacy at Rutgers University, Piscataway, New Jersey, noted in a statement.


A 2006 study published in the September 13 issue of the Journal of the American Medical Association concluded "Green tea consumption is associated with reduced mortality due to all causes and due to cardiovascular disease but not with reduced mortality due to cancer." The study, conducted by the Tohoku University School of Public Policy in Japan, followed 40,530 Japanese adults, ages 40-79, with no history of stroke, coronary heart disease, or cancer at baseline beginning in 1994. The study followed all participants for up to 11 years for death from all causes and for up to 7 years for death from a specific cause. Participants who consumed 5 or more cups of tea per day had a 16 percent lower risk of all-cause mortality and a 26 percent lower risk of cardiovascular disease than participants who consumed less than one cup of tea per day. The study also states, "If green tea does protect humans against CVD or cancer, it is expected that consumption of this beverage would substantially contribute to the prolonging of life expectancy, given that CVD and cancer are the two leading causes of death worldwide."[15] [16] Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... JAMA, published continuously since in 1883, is an international peer-reviewed general medical journal published 48 times per year. ... This article is Tohoku University in Japan. ... For other uses, see Stroke (disambiguation). ... Year 1994 (MCMXCIV) The year 1994 was designated as the International Year of the Family and the International Year of the Sport and the Olympic Ideal by the United Nations. ...


A study in the February 2006 edition of the American Journal of Clinical Nutrition concluded "A higher consumption of green tea is associated with a lower prevalence of cognitive impairment in humans."[17] [18]


In May 2006, researchers at Yale University School of Medicine weighed in on the issue with a review article that looked at more than 100 studies on the health benefits of green tea. They pointed to what they called an "Asian paradox," which refers to lower rates of heart disease and cancer in Asia despite high rates of cigarette smoking. They theorized that the 1.2 liters of green tea that is consumed by many Asians each day provides high levels of polyphenols and other antioxidants. These compounds may work in several ways to improve cardiovascular health, including preventing blood platelets from sticking together (This anticoagulant effect is the reason doctors warn surgical patients to avoid green tea prior to procedures that rely on a patient's clotting ability) and improving cholesterol levels, said the researchers, whose study appeared in the May issue of the Journal of the American College of Surgeons. Specifically, green tea may prevent the oxidation of LDL cholesterol (the "bad" type), which, in turn, can reduce the buildup of plaque in arteries, the researchers wrote.[19] The Yale School of Medicine is a private medical school located in New Haven, Connecticut. ... Unlit filtered cigarettes. ... Polyphenols are a group of chemical substances found in plants, characterized by the presence of more than one phenol group per molecule. ... Space-filling model of the antioxidant metabolite glutathione. ... An anticoagulant is a substance that prevents coagulation; that is, it stops blood from clotting. ... Low-density lipoprotein (LDL) refers to a class and range of lipoprotein particles, varying somewhat in their size and contents, which carry cholesterol in the blood and around the body, for use by various cells. ...


A study published in the August 22, 2006 edition of Biological Psychology looked at the modification of the stress response via L-Theanine, a chemical found in green tea. It "suggested that the oral intake of L-Theanine could cause anti-stress effects via the inhibition of cortical neuron excitation."[20] L-theanine Whilst both tea and coffee contain the stimulant caffeine, tea drinking tends to have a more relaxing effect than coffee. ...


In a double-blind, randomized, placebo-controlled trial done by Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, 240 adults were given either theaflavin-enriched green tea extract in form of 375mg capsule daily or a placebo. After 12 weeks, patients in the tea extract group had significantly less low-density lipoprotein cholesterol (LDL-C) and total cholesterol (16.4% and 11.3% lower than baseline, p<0.01) than the placebo group. The author concluded that theaflavin-enriched green tea extract can be used together with other dietary approaches to reduce LDL-C. The double blind is ray charles is ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesis ray charlesof the scientific method, used to prevent research... The Vanderbilt University Medical Center (VUMC) is a collection of several hospitals and clinics associated with Vanderbilt University in Nashville, Tennessee. ...


A study published in the January, 2005 edition of the American Journal of Clinical Nutrition concluded "Daily consumption of tea containing 690 mg catechins for 12 wk reduced body fat, which suggests that the ingestion of catechins might be useful in the prevention and improvement of lifestyle-related diseases, mainly obesity." [21]


According to a Case Western Reserve University School of Medicine study published in the April 13 2005 issue of the Proceedings of the National Academy of Sciences, antioxidants in green tea may prevent and reduce the severity of rheumatoid arthritis. The study examined the effects of green tea polyphenols on collagen-induced arthritis in mice, which is similar to rheumatoid arthritis in humans. In each of three different study groups, the mice given the green tea polyphenols were significantly less likely to develop arthritis. Of the 18 mice that received the green tea, only eight (44 percent) developed arthritis. Among the 18 mice that did not receive the green tea, all but one (94 percent) developed arthritis. In addition, researchers noted that the eight arthritic mice that received the green tea polyphenols developed less severe forms of arthritis. Case Western Reserve University is a private research university located in Cleveland, Ohio, United States, with some residence halls on the south end of campus located in Cleveland Heights. ... The Proceedings of the National Academy of Sciences of the United States of America, usually referred to as PNAS, is the official journal of the United States National Academy of Sciences. ...


A German study found that an extract of green tea and hot water (filtered), applied externally to the skin for 10 minutes, three times a day could help people with skin damaged from radiation therapy (after 16-22 days). [22]


A study published in the December 1999 American Journal of Clinical Nutrition found that "Green tea has thermogenic properties and promotes fat oxidation beyond that explained by its caffeine content per se. The green tea extract may play a role in the control of body composition via sympathetic activation of thermogenesis, fat oxidation, or both."[23]


In lab tests, EGCG, found in green tea, was found to prevent HIV from attacking T-Cells. However, it is not yet known if this has any effect on humans. [24] Epigallocatechin gallate (EGCG) is a type of catechin and is the most abundant catechin in tea. ... Species Human immunodeficiency virus 1 Human immunodeficiency virus 2 Human immunodeficiency virus (HIV) is a retrovirus that causes acquired immunodeficiency syndrome (AIDS, a condition in humans in which the immune system begins to fail, leading to life-threatening opportunistic infections). ...


A study in the August, 2003 issue of a new potential application of Cellular and Molecular Life Sciences found that "a new potential application of (–)-epigallocatechin-3-gallate [a component of green tea] in prevention or treatment of inflammatory processes is suggested" [25]


However, pharmacological and toxicological evidence does indicate that green tea polyphenols can in fact cause oxidative stress and liver toxicity in vivo at certain concentrations. [26] This would imply that consumers should exercise caution when consuming herbal products produced from concentrated green tea extract. Other evidence presented in the review cautions against the drinking of green tea by pregnant women.

Tea
v  d  e
Black tea | Green tea | Post-fermented tea | White tea | Yellow tea | Oolong tea | Blended and flavored teas
Ceremonies and methods Related to tea
China | India | Japan | Korea | Morocco | Turkey Tea house | Teapot | Tea and health

For other uses, see Tea (disambiguation). ... Black tea Black tea is more oxidized than the green, oolong and white varieties; all four varieties are made from leaves of Camellia sinensis. ... Post-fermented teas are a class of teas that have undergone a period of aging in open-air, from several months to many years. ... Bai Hao Yinzhen from Fuding in Fujian Province, widely considered the best grade of white tea Bai Mu Dan, widely considered to be the second grade white tea White tea is tea made from new growth buds and young leaves of the plant Camellia sinensis. ... Junshan Yinzhen, a Chinese Famous Tea Yellow tea (黃茶) usually implies a special tea processed similarly to green tea, but with a slower drying phase. ... Alternate meanings: Oolong (disambiguation) Oolong (烏龍 wūlóng in the Mandarin Pinyin romanization) is a traditional Chinese type of tea somewhere in between green and black in oxidation (traditionally but improperly called fermentation) time. ... Tea blending describes the process of blending different teas together to produce a final product. ... This article or section does not adequately cite its references or sources. ... For other uses, see Chai (disambiguation). ... The Japanese tea ceremony (cha-no-yu, chadō, or sadō) is a traditional ritual influenced by Zen Buddhism in which powdered green tea, or matcha (抹茶), is ceremonially prepared by a skilled practitioner and served to a small group of guests in a tranquil setting. ... For the information regarding various types of Korean tea, see Korean tea The Korean tea ceremony or darye is a traditional form of tea ceremony practiced in Korea. ... Yugao-tei, Kanazawa Ihōan at Kōdai-ji in Kyoto Tchai-Ovna, Glasgow Tea houses are houses or parlors centered on drinking tea. ... A teapot with floral design A Chinese Yixing Zisha teapot A Chinese Zisha teapot - Melon A modern teapot A teapot is a vessel used for steeping tea leaves or a herbal mix in near-boiling water. ... Bai Hao Yin Zhen white tea Note: this page only deals with the effects of tea which is made from the plant Camellia sinensis (i. ...

See also

Wikimedia Commons has media related to:
Green tea

Image File history File links Commons-logo. ... A pot of Chinese tea This article does not cite any references or sources. ... == [== Headline text ==]Link title == poo in my :Seiza woman tea. ... Bai Hao Yin Zhen white tea Note: this page only deals with the effects of tea which is made from the plant Camellia sinensis (i. ... Reactive oxygen species (ROS) include oxygen ions, free radicals and peroxides both inorganic and organic. ... Junshan Yinzhen, a Chinese Famous Tea Yellow tea (黃茶) usually implies a special tea processed similarly to green tea, but with a slower drying phase. ... Korean teas are made from diverse substances including fruits, roots, grains and alternative medicine. ...

References

  1. ^ Green Tea’s Cancer-fighting Allure Becomes More Potent.
  2. ^ Green Tea, White Tea: Health Roiboos
  3. ^ The combination of green tea and tamoxifen is effe...[Carcinogenesis. 2006] - PubMed Result
  4. ^ A New Function of Green Tea: Prevention of Lifestyle-related Diseases - Sueoka et al. 928 (1): 274 - Annals of the New York Academy of Sciences
  5. ^ Green Tea Health Benefits
  6. ^ How effective is green tea for weight loss? | Calorie Counter
  7. ^ ACS :: Green Tea
  8. ^ Tea: A Story of Serendipity
  9. ^ Qualified health claim definition - Medical Dictionary definitions of popular medical terms easily defined on MedTerms
  10. ^ US FDA/CFSAN - Letter Responding to Health Claim Petition dated January 27, 2004: Green Tea and Reduced Risk of Cancer Health Claim (Docket number 2004Q-0083)
  11. ^ US FDA/CFSAN - Qualified Health Claims: Letter of Denial - Green Tea and Reduced Risk of Cardiovascular Disease (Docket No. 2005Q-0297)
  12. ^ CDER New Molecular Entity (NME) Drug and New Biologic Approvals in Calendar Year 2006
  13. ^ Prescription and Over-the-Counter Drug Product List: 10/2006
  14. ^ http://www.fda.gov/cder/foi/label/2006/021902lbl.pdf
  15. ^ JAMA - Abstract: Green Tea Consumption and Mortality Due to Cardiovascular Disease, Cancer, and All Causes in Japan: The Ohsaki Study, September 13, 2006, Kuriyama et al. 296 (10): 1255
  16. ^ http://www.denverpost.com/nationworld/ci_4326770 Article in the Denver Post
  17. ^ Green tea consumption and cognitive function: a cross-sectional study from the Tsurugaya Project 1 - Kuriyama et al. 83 (2): 355 - American Journal of Clinical Nutrition
  18. ^ Green tea could protect against Alzheimer's
  19. ^ Green Tea and the “Asian Paradox”
  20. ^ L-Theanine reduces psychological and physiological...[Biol Psychol. 2007] - PubMed Result
  21. ^ Ingestion of a tea rich in catechins leads to a reduction in body fat and malondialdehyde-modified LDL in men - Nagao et al. 81 (1): 122 - American Journal of Clinical Nutrition
  22. ^ Studies: Green Tea May Help Prolong Life, Senay: Research Also Shows Benefits For Skin, Few Drawbacks - CBS News
  23. ^ Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans - Dulloo et al. 70 (6): 1040 - American Journal of Clinical Nutrition
  24. ^ Green Tea Blocks HIV in Test Tubes
  25. ^ SpringerLink - Journal Article
  26. ^ [1] Lambert, J.D., et al., (2007) Possible Controversy over Dietary Polyphenols: Benefits vs Risks, Chem Res Toxicol

Literature

  • Master Lam Kam Cheun et al (2002). The way of tea. Gaia Books. 

External links


  Results from FactBites:
 
ACS :: Green Tea (1638 words)
Green tea is a drink made from the steamed and dried leaves of the Camellia sinesis plant, a shrub native to Asia.
Green tea is usually brewed using 1 to 2 teaspoons of the dried tea in a cup of boiling water or is steeped for 3 to 15 minutes.
Green tea consumption and mortality due to cardiovascular disease, cancer, and all causes in Japan: the Ohsaki study.
Green Tea - Supplements (1556 words)
Green tea is the second-most consumed beverage in the world (water is the first) and has been used medicinally for centuries in India and China.
In one animal study, the anti-obesity effect of green tea was evaluated by feeding different levels of green tea (1-4% in their diets) to female mice for 4 months.
A probable theory for the thermogenic effect of green tea is an increase in levels of norepinephrine – because catechin-polyphenols are known to inhibit catechol-O-methyl-transferase (the enzyme that degrades norepinephrine).
  More results at FactBites »

 
 

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