1, black tea
Black tea is a kind of fully fermented tea, which is refined through a series of technological processes such as withering, rolling (cutting), fermentation and drying. Withering is an important process in the primary processing of black tea, which is called "black tea" in the primary processing. Black tea is named after the tea soup and leaf background color are red after brewing dry tea. The varieties of China black tea mainly include Rizhao black tea, Zhaopinghong, Huohong, Dianhong, Yue Hong, Quanchenghong, Quanchenglv, Su Hong, Chuanhong, and Dongjiang Chuyunxian black tea. Qimen black tea is the most famous. In 20 13, Chu Yunxian black tea from Dongjiang, Hunan Province won the special prize of "China Tea Cup".
Main effects of black tea
(1) black tea diuresis
Under the combined action of caffeine and aromatic substances in black tea, renal blood flow increased. Improve glomerular filtration rate, dilate renal microvessels, and inhibit the reabsorption of water by renal tubules, thus contributing to the increase of urine volume. This helps to eliminate excessive lactic acid, uric acid (related to gout) and excessive salt (related to hypertension) in the body, and can also relieve edema caused by heart disease or nephritis.
(2) Anti-inflammatory and sterilization of black tea?
Polyphenols in black tea have anti-inflammatory effects, and catechins can combine with unicellular bacteria to coagulate and precipitate protein, thus inhibiting and eliminating pathogenic bacteria. It is beneficial for patients with bacillary dysentery and food poisoning to drink black tea, and people often smear wounds with black tea.
(3) Black tea is refreshing.
Caffeine in black tea can stimulate the nerve center of cerebral cortex, achieve the effect of refreshing the brain, and then make the thinking reaction more acute. Memory enhancement; It also has an exciting effect on the vascular system and the heart, strengthens the heartbeat, and thus accelerates the blood circulation of metabolism. At the same time, it promotes sweating and diuresis, thus accelerating the excretion of old waste materials such as lactic acid in the body and achieving the effect of eliminating fatigue.
(4) Does black tea produce fluid and clear heat?
Drinking black tea can quench thirst and relieve summer heat, because polyphenols, sugars, amino acids and pectin in tea react with saliva, which can stimulate saliva secretion and moisten the mouth. In addition, under the control of caffeine, the temperature center of hypothalamus can regulate body temperature, stimulate the kidney to promote the discharge of heat, and maintain the physiological balance in the body.
(5) nourishing the stomach and protecting the stomach?
When people drink green tea instead of eating, they will feel sick to their stomachs. This is because tea polyphenols, an important substance contained in tea, have astringent taste and have a certain stimulating effect on the stomach, especially on an empty stomach. Black tea is different. It is made by fermentation and baking. Black tea not only won't hurt the stomach, but also nourish it. Drinking black tea with sugar and milk often can diminish inflammation, protect gastric mucosa and have a certain effect on treating ulcers.
2. Black tea
Black tea belongs to one of the six major teas and belongs to post-fermented tea. The main producing areas are Sichuan, Yunnan, Hubei, Hunan, Shaanxi, Anhui and other places. Black tea used in traditional black tea has a high maturity and is the main raw material for pressing pressed tea.
The tea-making technology of black tea generally includes four processes: enzyme fixation, rolling, fermentation and drying. According to geographical distribution, black tea is mainly divided into Hunan black tea (Fu tea, Liang Qian tea, black brick tea, Sanjian tea, etc. ), Hubei blue brick tea, Sichuan Tibetan tea (border tea), Anhui ancient black tea (ancha), yunnan black tea (Pu 'er tea), Guangxi Liubao tea and Shaanxi black tea (Fuzha tea).
What is the main function of black tea?
(1) Reduce fat and lose weight
Tea polyphenols and their oxidation products in black tea can dissolve fat and promote the discharge of lipid substances, thus reducing the contents of total cholesterol, free cholesterol, low-density lipoprotein cholesterol and triglyceride in blood, thus reducing cholesterol deposition on arterial wall and reducing the incidence of arterialization.
It can also activate protein kinase, accelerate fat decomposition and reduce body fat content. Through experiments on human body, scientists found that compared with people who drink ordinary water, the average daily energy consumption of people who drink tea is 67eal higher, and the fat oxidation rate is higher than 12%. This proves that black tea does have the function of reducing fat and weight.
(2) Enhance gastrointestinal function and improve immunity.
The effective components of black tea can not only inhibit the growth of harmful microorganisms in human stomach, but also promote the growth and reproduction of beneficial bacteria (such as lactic acid bacteria), which has a good effect on regulating gastrointestinal function. Its alkaloids can promote the secretion of gastric juice, and flavanol can significantly enhance gastrointestinal peristalsis.
The study also found that catechins and tea saponin in black tea can kill and inhibit the growth of oral bacteria, helicobacter, Escherichia coli, typhoid, paratyphoid, staphylococcus and other pathogenic bacteria, so they have obvious functions of relieving stagflation, stopping diarrhea and eliminating constipation, which is of great significance to white-collar workers who often sit and work, and is also a folk medicine for stopping diarrhea. Theanine in black tea has a good effect on enhancing human immunity.
(3) Anti-aging, regulating cranial nerves.
There is a synchronous process between the natural aging of human body and degenerative diseases including tumors and cardiovascular diseases, that is, cells are damaged by oxygen free radicals. More than 95% of free radicals in human body are oxygen free radicals, which are the basis of destroying biological macromolecules and participate in the occurrence and development of various diseases and aging.