Drinking tea is also particular

Since ancient times, "Chai Mi oil and salt sauce vinegar tea" is commonly known as "seven things to open the door". Today we have introduced the impact of tea on human health and the principles of scientific tea from the classification of tea, the efficacy of tea, and the precautions of tea tasting.

Tea can be divided into six types: green tea, black tea, yellow tea, white tea, green tea, and black tea.

Green tea is mostly non -fermented tea. It is the most typical of West Lake Longjing, Nanjing Yuhua Tea, Emei Bamboo Leaf Green, Huangshan Maofeng and Xinyang Maojian; black tea is full of fermented tea, with Anhui Qihong, Yunnan Dianhong, Guangdong Yinghong and Zhengshan Xiaoshima. Famous, among which Qi Hong and India's Dajiling black tea and Sri Lanka Usa black tea are tied as the world's three major mountain black tea; the core process of yellow tea is 'sullen yellow', and the green tea becomes yellow tea by increasing the processing steps of "stuffy stack". , Typical of Hunan Junshan Silver Needle, Anhui Huoshan Yellow Tea, Guangdong Daye Qing and Sichuan Mengding Yellow buds; white tea is light fermented tea, including white silver needles, white peony, tribute eyebrows, and Shoumei. Oolong tea, founded in Fujian, Tieguanyin, Dahongpi, Wuyi Rock Tea, and Taiwan oolong are the most typical; black tea is fermented tea, which are mostly distributed in areas where ethnic minorities gather, such as Yunnan, Hubei, Sichuan, Hunan and other places. Anhua black tea, Sichuan border tea, Hunan tiles and Pu'er tea.

Studies have found that there are 300-500 chemical components in tea, mainly including protein, amino acids, sugar, fat, tea polysaccharides, camellia, camellia, teaine, alkaline, saponin, etc.

Tea polyphenol tea contains nearly 30 phenolic compounds, mainly includes catechins and its oxides, which have the effects of eliminating free radicals, antiviral, sterilization and anti -radiation.

Tea polysaccharide tea contains monosaccharides and polysaccharides. Clinically, patients with hypertension, hyperlipidemia, and hyperglycemia have a good prevention and health effect.

Cateles contained in catechide tea can enhance memory, eliminate fatigue, help sedative nerves, and relieve mental tension.

Tea saponin anti -inflammatory analgesic and antihypertensive, can effectively reduce serum cholesterol, can also be calm and antitussive, suitable for senile cough or three high patients.

Vitamin tea is rich in vitamins, including vitamin A, B vitamin, vitamin E, vitamin C, etc. Among them, vitamin C and B vitamin are the most abundant. Vitamin A can prevent night blindness and dry eye disease; vitamin C has a good anti -inflammatory effect, can promote the rapid healing of the wound, increase the body's resistance; B vitamins can maintain human body metabolism and relieve mental stress; vitamin E can protect cardiovascular and cerebrovascular vascular Essence

Mineral tea contains selenium, which can effectively improve human immunity, prevent cancer and Keshan disease. Tea also contain fluorine. Fluoride is an indispensable ingredient for human body teeth and bones. It has the effect of cleaning teeth and preventing dental caries. It also has a good prevention and treatment effect on osteoporosis of elderly patients.

Studies have shown that the ratio of tea and water science is 1:50, that is, 3 grams of tea leaves are generally soaked in 150 ml of hot water. After 30 seconds, pouring the water to "wash tea", and then pick up a cup of cups. Water is covered in for about 15 minutes, then open the cup lid, and drink it according to the water temperature.

But it should be reminded that, first of all, do not drink tea or drink strong tea on an empty stomach. It will stimulate gastrointestinal mucosa, affect the normal secretion of gastric acid, cause excessive gastric acid secretion, prone to indigestion and gastric ulcer.

Second, avoid drinking tea at meals, or drink tea before and after meals. But drink after a hour after meals to avoid the response of the catechol in the tea with the iron ions in the food, and reduce the absorption of iron to iron. Patients with iron deficiency anemia should pay special attention.

Third, people with kidney stones should pay attention to drinking tea. Tea contains a certain amount of oxalic acid, and its caffeine will increase the calcium ions in the blood. It is easy to combine with calcium ions. It is excreted through the kidney and is easy to form calcium oxalicate stones in the kidney.

Fourth, do not drink tea before going to bed. Tea contains caffeine, which can excite the center of the brain and have a certain impact on sleep.

(The author is Song Tianli, Department of Medicine, Hubei University for Nationalities)

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