Green tea has origin in China more than 4000 years ago. It has been used as both a beverage and a method of traditional medicine in most of Asia, including China, Japan, Taiwan, Vietnam, Korea and Thailand, to help everything from controlling bleeding and helping heal wounds to regulating body temperature, blood sugar and promoting digestion.It has become associated with many cultures in Asia from Japan and South Korea 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. These varieties can differ substantially due to variable growing conditions, processing, and harvesting time.From last few decades green tea has been subjected to many scientific and medical studies to determine the extent of its long-purported health benefits, with some evidence suggesting that regular green tea drinkers have lower chances of heart disease and developing certain types of cancer.Although green tea does not raise the metabolic rate enough to produce immediate weight loss, a green tea extract containing polyphenols and caffeine has been shown to induce thermogenesis and stimulate fat oxidation, boosting the metabolic rate 4% without increasing the heart rate.The Fujian Province is known for mountain-grown organic green tea as well as white and oolong teas. The coastal mountains provide a perfect growing environment for tea growing. Green tea is picked in spring and summer seasons.
|Green tea leaves|
Research shows that green tea lowers total cholesterol and raises HDL cholesterol in both animals and people. A clinical study found that men who drink green tea are more likely to have lower total cholesterol than those who do not drink green tea. It contains caffeine, which stimulates the central nervous system, and tannins, which combat diarrhea. Taken in moderation, green tea settles the stomach and has mild stimulant effects. However when taken in excess, it can cause insomnia and digestive problems.Green tea has been used traditionally to control blood sugar in the body.Green tea contains salubrious polyphenols, particularly catechins, the most abundant of which is epigallocatechin gallate. Green tea also contains carotenoids, tocopherols, ascorbic acid , minerals such as chromium,
manganese, selenium or zinc, and certain phytochemical compounds. It is a more potent antioxidant than black tea.Similarly the contribution of fat oxidation to total energy expenditure was also significantly higher by a similar percentage following ingestion of green tea extract. This implies that ingestion of green tea extract can not only increase fat oxidation during moderately intensive exercise but also improve insulin sensitivity and glucose tolerance in healthy young men.A study performed at the Queen Margaret University, Edinburgh looked at the effects of short term green tea consumption on a group of students between the ages of 19–37. Participants were asked not to alter their diet and to drink 4 cups of green tea per day for 14 days. The results showed that short term consumption of commercial green tea reduces systolic and diastolic Blood Pressure, fasting total cholesterol, body fat and body weight. These results suggest a role for green tea in decreasing established potential cardiovascular risk factors. This study also suggests that reductions may be more pronounced in the overweight population where a significant proportion are obese and have a high risk of cardiovascular disease.
The National Cancer Institute published the results of an epidemiological study indicating that drinking green tea reduced the risk of esophageal cancer in Chinese men and women by nearly sixty percent.Green tea can even help prevent tooth decay. It has bacteria-destroying abilities can help prevent food poisoning, it can also kill the bacteria that causes dental plaque.
A negative side effect reported from drinking green tea is insomnia due to the fact that it contains caffeine. However, green tea contains less caffeine than coffee.There are approximately thirty to sixty mg. of caffeine in six - eight ounces of tea, compared to over one-hundred mg. in eight ounces of coffee.