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Green Tea

Parts of green tea used and where is green tea grown
All teas (green, black, and oolong) are derived from the same plant, Camellia sinensis. The difference is in how the plucked leaves are prepared. Green tea, unlike black and oolong tea, is not fermented, so the active constituents remain unaltered in the herb. The leaves of the tea plant are used both as a social and a medicinal beverage.
Green tea has been used in connection with the following conditions
(refer to the individual health concern for complete information):

Rating
Health Concerns
sd

Atherosclerosis
Colon cancer (reduces risk)
High cholesterol
Leukoplakia
Tooth decay
Weight loss

sd

Breast cancer (risk reduction)
Crohn’s disease
Hemochromatosis (iron overload)
High triglycerides
Hives
Immune function
Infection
Lung cancer (risk reduction)

Reliable and relatively consistent scientific data showing a substantial health benefit.
Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support and/or minimal health benefit.












 

 Historical or traditional use of green tea

(may or may not be supported by scientific studies)
According to Chinese legend, tea was discovered accidentally by an emperor 4,000 years ago. Since then, Traditional Chinese Medicine has recommended green tea for headaches, body aches and pains, digestion, depression, immune enhancement, detoxification, as an energizer, and to prolong life.

Active constituents of green tea
Green tea contains volatile oils, vitamins, minerals, and caffeine, but the primary constituents of interest are the polyphenols, particularly the catechin called epigallocatechin gallate (EGCG). The polyphenols are believed to be responsible for most of green tea’s roles in promoting good health.1

Green tea has been shown to mildly lower total cholesterol levels and improve the cholesterol profile (decreasing LDL “bad” cholesterol and increasing HDL “good” cholesterol) in most,2 3 4 5 but not all,6 studies. Green tea may also promote cardiovascular health by making platelets in the blood less sticky.

Green tea has also been shown to protect against damage to LDL (“bad”) cholesterol caused by oxygen.7 Consumption of green tea increases antioxidant activity in the blood.8 Oxidative damage to LDL can promote atherosclerosis. While population studies have suggested that consumption of green tea is associated with protection against atherosclerosis,9 the evidence is still preliminary.

Several animal and test tube studies have demonstrated an anticancer effect of polyphenols from green tea.10 11 12 In one of these studies, a polyphenol called catechin from green tea effectively inhibited metastasis (uncontrolled spread) of melanoma (skin cancer) cells.13 The polyphenols in green tea have also been associated with reduced risk of several types of cancer in humans.14 15 16However, some human studies have found no association between green tea consumption and decreased cancer risk.17 18

In a double-blind trial, people with leukoplakia (a pre-cancerous oral condition) took 3 grams orally per day of a mixture of whole green tea, green tea polyphenols, and green tea pigments orally, and also painted a mixture of the tea on their lesions three times daily for six months.19 As compared to the placebo group, those in the green tea group had significant decreases in the pre-cancerous condition.

Compounds in green tea, as well as black tea, may reduce the risk of dental caries.20 Human volunteers rinsing with an alcohol extract of oolong tea leaves before bed each night for four days had significantly less plaque formation, but similar amounts of plaque-causing bacteria, compared to those with no treatment.21

Green tea polyphenols have been shown to stimulate the production of several immune system cells, and have topical antibacterial properties—even against the bacteria that cause dental plaque.22 23 24

One study found that intake of 10 cups or more of green tea per day improved blood test results, indicating protection against liver damage.25 Further studies are needed to determine if taking green tea helps those with liver diseases.

Tea flavonoids given by capsule reduced fecal odor and favorably altered the gut bacteria in elderly Japanese with feeding tubes living in nursing homes.26 The study was repeated in bedridden elderly not on feeding tubes, and green tea was again shown to improve their gut bacteria.27 These studies raise the possibility of using green tea in other settings where gut bacteria are disturbed, such as after taking antibiotics. Further studies are needed to clarify the role of green tea in this respect, however.

High-tannin tea has been shown to reduce the need for blood removal from people with iron overload, or hemochromatosis, in an open study.28 The tea had to be taken with meals and without lemon or milk to be effective. Tea is believed to help in hemochromatosis by preventing iron absorption.

How much green tea is usually taken?
Much of the research documenting the health benefits of green tea is based on the amount of green tea typically consumed in Asian countries—about 3 cups (750 ml) per day (providing 240–320 mg of polyphenols).29 However, other research suggests as much as 10 cups (2,500 ml) per day is necessary to obtain noticeable benefits from green tea ingestion.30 31 To brew green tea, 1 teaspoon (5 grams) of green tea leaves are combined with 1 cup (250 ml) of boiling water and steeped for three minutes. Decaffeinated tea is recommended to reduce the side effects associated with caffeine, including anxiety and insomnia. Tablets and capsules containing standardized extracts of polyphenols, particularly EGCG, are available. Some provide up to 97% polyphenol content—which is equivalent to drinking 4 cups (1,000 ml) of tea. Many of these standardized products are decaffeinated.

Are there any side effects or interactions with green tea?
Green tea is generally free of side effects. The most common adverse effects reported from consuming large amounts (several cups per day) of green tea are insomnia, anxiety, and other symptoms caused by the caffeine content in the herb.

An extract of green tea taken by healthy women with a meal inhibited the absorption of non-heme iron (e.g., the form of iron in plant foods) by 26%.32 Frequent use of green tea could, in theory, promote the development of iron deficiency in susceptible individuals.

Are there any drug interactions?
Certain medicines may interact with green tea. Refer to drug interactions for a list of those medicines

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