1. Helps to delay aging.
Tea polyphenols have strong oxidation resistance and physiological activity, and are scavengers of human free radicals. According to the research of relevant departments, the efficacy of 1 mg tea polyphenols in scavenging excessive free radicals harmful to human body is equivalent to 9 μ g superoxide dismutase (SOD), which is much higher than other similar substances. Tea polyphenols can block lipid peroxidation and remove active enzymes. According to the test results of Tomoyo in Ota, Japan, it is confirmed that the anti-aging effect of tea polyphenols is stronger than that of vitamin E 18 times.
2. Helps to inhibit cardiovascular diseases.
Tea polyphenols play an important role in human fat metabolism. The human body has cardiovascular diseases such as high cholesterol and triglycerides, such as fat deposition on the inner wall of blood vessels and atherosclerotic plaques formed after vascular smooth muscle cells proliferate. Tea polyphenols, especially catechins ECG and EGC in tea polyphenols and its oxidation products theaflavins, are helpful to inhibit this mottled proliferation, reduce the formation of fibrinogen that enhances coagulation viscosity, make coagulation clear, and thus inhibit atherosclerosis.
3. Help to prevent and fight cancer.
Tea polyphenols can block the synthesis of carcinogens such as nitrite in the body, which can directly kill cancer cells and improve the immune ability of the body. According to relevant data, tea polyphenols (mainly catechins) in tea are beneficial to the prevention and adjuvant treatment of cancers such as gastric cancer and intestinal cancer.
4. It is helpful to prevent and treat radiation injury.
Tea polyphenols and their oxidation products have the ability to absorb the toxicity of radioactive substances strontium 90 and cobalt 60. According to the clinical trials of relevant medical departments, the treatment of mild radiation sickness caused by radiotherapy with tea extract can reach more than 90%. For cytopenia, the effective rate of tea extract is 865438 0.7%; It has a good therapeutic effect on leukopenia caused by radiation.
5. Help to inhibit and resist viruses and bacteria.
Tea polyphenols have strong convergence, obvious inhibition and killing effects on pathogenic bacteria and viruses, and obvious anti-inflammatory and antidiarrheal effects. Many medical units in China use tea preparation to treat acute and chronic dysentery and amebic dysentery, and the cure rate is about 90%.
6. It is helpful for beauty and skin care
Tea polyphenols is a water-soluble substance. Washing eyelids with it can remove facial greasy, astringe pores, and has the functions of disinfection, sterilization, delaying skin aging and reducing the damage of ultraviolet rays in the sun to the skin.
7. Help refresh yourself
Caffeine in tea can stimulate the central nervous system of human body, enhance the excitement process of cerebral cortex, and has the functions of refreshing the brain, clearing away heart fire and calming the nerves.
8. Helps to induce diuresis and relieve fatigue.
Caffeine in tea can stimulate the kidney, promote the rapid excretion of urine, improve the filtration rate of the kidney and reduce the retention time of harmful substances in the kidney. Caffeine can also eliminate excessive lactic acid in urine, which helps to eliminate fatigue as soon as possible.
9. It helps to lower blood fat and help digestion.
It is recorded in the Tang Dynasty that the effect of tea is "eating for a long time makes you thin". There is a saying among the ethnic minorities in China's border areas that "tea is indispensable for a day". Because tea helps digestion and reduce fat, in today's fashionable language, it is helpful to "lose weight". This is because caffeine in tea can increase the secretion of gastric juice, help digestion and enhance the ability to decompose fat. The so-called "long-term eating makes people thin" is here.
10. Helps protect teeth and improve eyesight.
The fluorine content in tea is high, and the fluorine content per 100 g of dry tea is 100 mg ~ 15 mg, of which 80% is water soluble. If everyone drinks 10g tea every day, they can absorb 1mg ~ 1.5mg water-soluble atmosphere. Moreover, tea is an alkaline beverage, which can inhibit the reduction of calcium in the human body, help prevent dental caries, protect teeth and strengthen teeth. According to relevant data, the experiment of "gargling with tea after meals" among primary school students can reduce the incidence of dental caries by 80%. According to the investigation of relevant medical units, 28.6% cataract patients have the habit of drinking tea; 7 1.4% have no habit of drinking tea. This is because vitamin C and other ingredients in tea can reduce the turbidity of eyes, and drinking tea often has a positive effect on reducing eye diseases, protecting eyes and improving vision.
Tea species in China
Green tea:
Green tea is a kind of tea without fermentation. Because its leaves and soup are green, it is named. The top ten famous teas in China are West Lake Longjing, Taihu Lake Biluochun, Huangshan Mao Feng, Lu 'an Guapian, Junshan Yinzhen, Xinyang Maojian, Taiping Monkey Kui, Lushan Wu Yun, Sichuan Mengding and Guzhu Zizun Tea.
Black tea:
Black tea is a kind of tea made by fermentation. It is named because its leaves and soup are red. The famous black teas in China are Qi Hong in An Wei, Zhen Hong in Yunnan, Hong Xuan in Hubei and Chuanhong in Sichuan.
Scented tea:
Scented tea is one of the finished products of green tea. It is made of fragrant flowers in tea embryo. Commonly used fragrant flowers include jasmine, Zhu Lan, Zanzan, rose and grapefruit. Fujian, Jiangsu, Zhejiang, Anhui and Sichuan are the main producing areas. Suzhou jasmine tea is a famous product in scented tea; Fujian jasmine tea belongs to Luzhou-flavor tea, with mellow soup, rich fragrance, yellow-green soup color and lasting taste.
Oolong tea:
Oolong tea is a semi-fermented tea, which is characterized by green leaves in the center and red edges, commonly known as green leaves and red edges. Location: Fujian, Guangdong and Taiwan Province provinces. Generally, it is named after the tea trees in its place of origin, such as Tieguanyin, Dahongpao, Oolong Tea, Narcissus, Danzong and so on. It has the fragrance of black tea, but it is more astringent than ordinary black tea; It has the refreshing taste of green tea, but not the astringency of ordinary green tea. Its aroma is rich and lasting, and it remains fragrant after drinking, and it has the effects of refreshing, promoting digestion, stopping dysentery, relieving summer heat and sobering up. In the early Qing dynasty, it was exported to Europe, America and Southeast Asian countries. Now it is the most popular among Japanese tourists.
White tea:
White tea is a kind of tea that has not been fermented or kneaded. Tea is divided into white tea, narcissus white tea and mountain white tea with natural fragrance, so it is named white tea. Among them, the silver needle is the most precious, which is characterized by being covered with fine white hairs and silver flowers. The soup is yellowish and sweet. Location: Fuding County and Zhenghe County, Fujian Province.
Brick tea:
Brick tea belongs to pressed tea. Green tea, scented tea, old green tea and other raw tea are used as raw materials and autoclaved in brick molds. Location: Yunnan, Sichuan, Hunan, Hubei and other places. Brick tea, also known as edge tea, is mainly sold in frontier and pastoral areas.