Green tea is the main tea in China, with the highest yield among the six primary teas, with an annual output of about 400,000 tons. Green tea has the widest producing area, distributed in Zhejiang, Anhui, Jiangxi, Jiangsu, Sichuan, Hunan, Hubei, Guangxi, Fujian, Guizhou and other tea areas.
Hangzhou Longjing, Huangshan Mao Feng, Dongting Biluochun, Lushan Wu Yun, Xinyang Maojian, Emei Zhuyeqing, Luan Guapian, Ancient Bamboo Purple Bamboo Shoots, Jiangshan Green Peony, Taiping Monkey Kui, Golden Award Huiming, Laozhu Dafang, Enshi Yulu, Mengding Gan Lu, Jianchun Tea and Xiuning Songmeng all belong to the category of green tea.
Green tea is made from fresh leaves that have been picked, killed by various oxidases at high temperature, kept green, and then kneaded and dried. Clear soup and green leaves are the same characteristics of green tea quality.
classify
According to the different ways of enzyme fixation and drying, it can be divided into:
First, steamed green tea
The steamed green tea is called steamed green tea. Its quality features are "three greens", that is, dry tea color green, soup color green, bright green leaves, and mellow Qing Xiang flavor.
B, stir-fry green tea
Fried green tea is named after frying and drying. According to the shape, it can be divided into three categories: long fried green, round fried green and flat fried green. Long fried green eyebrows, also known as eyebrow tea. Round fried green looks like particles, also known as pearl tea. Flat fried green is also called flat tea. The quality of stir-fried green is characterized by tight strips, moist color, high and lasting aroma, rich flavor, soup color and Huang Liang leaves. Stir-fried green has the quality characteristics of round and compact appearance, high fragrance and strong taste, and foam resistance. Flat fried green products are flat, smooth, fragrant and mellow, such as West Lake Longjing.
C, baking green tea
Baked green tea is often used to make all kinds of scented tea, which is called tea blank. It is characterized by complete and slightly curved appearance, seedling dew, dark green dry color, mellow Qing Xiang flavor, fresh yellow-green leaves and soup color.
D, drying green tea
Sun-dried green tea is the raw material for making pressed tea. Such as brick tea and Tuo tea.
According to a recent report in Japan's Yomiuri Shimbun, a lecturer from the Faculty of Medicine of Tohoku University found that people who drink more than two cups of green tea a day are much less likely to suffer from Alzheimer's disease such as cognitive dysfunction than those who drink less than three cups of green tea a week.
From July to August, 2003, Lishan's research team investigated the lifestyle habits of 70-96-year-old men and women in Sendai/Kloc-0, and then tested their cognitive functions such as memory and graphic depiction.
The results show that people who drink more than 2 cups of green tea a day are less likely to suffer from cognitive impairment than those who drink less than 3 cups, and there is not much difference between those who drink more than 4 cups a day. In this regard, the research team believes that drinking 2 cups a day can see the effect. Li Shan, a lecturer, said that in the future, people who don't drink green tea abroad will be investigated and further studied.
Green tea can purify blood vessels and prevent stroke and heart disease.
What effect does green tea have on arteriosclerosis, the root cause of heart disease? The production team did the experiment by themselves. Let men who smoke drink green tea four times a day for two weeks. Comparing the blood samples before and after the experiment, it was found that oxidized low density lipoprotein, a risk factor of arteriosclerosis, decreased, and the adhesion of cells such as SP- selectin, which caused the initial reaction of arteriosclerosis, also decreased.
The important risk factors of arteriosclerosis, oxidized -LDL (oxidized low-density cholesterol) and SP-selection, which caused the initial reaction of arteriosclerosis, also decreased.
The higher these values, the easier it is to have oil droplets on the blood vessel wall, and the end of a blood vessel called thrombus is easy to fall off. Thrombosis flows in blood vessels, blocking the cerebral vessels will lead to a stroke. Everyone knows that smoking can easily cause thrombosis and arteriosclerosis, and green tea can prevent this thrombosis and arteriosclerosis.
The production team visited Dr. Takeshima from Osaka City Hospital in Japan. He observed the effect of green tea on blood circulation. It turns out that people who drink green tea have smoother blood circulation than those who drink coffee, just like removing rust from rusty water pipes, the water flow will be smoother.
Coffee doesn't have this effect because it doesn't contain catechin, the essence of green tea. Catechin is a powerful antioxidant, which not only has anti-cancer effect, but also inhibits vascular aging, thus purifying blood. Green tea contains about 15% catechin, and the antioxidant capacity of catechin is 40~ 100 times that of vitamin C.