As one of China's unique teas, black tea has been used for drinking for hundreds of thousands of years and a large number of scientific experiments have proved that black tea has the functions of digestion and gastrointestinal treatment, hangover, anti-inflammatory sterilization, anti-cavity treatment, anti-mutation, anti-radiation, Anti-aging and other effects, especially for the modern people's high-fat, high-salt, high-protein, high-calorie diet structure, coupled with the lack of physical labor or exercise to form high blood lipids, high blood sugar, high blood pressure has a significant decline in conditioning trends. Much of the attention of the medical science community.
The effect and function of black tea
First, sterilization, anti-inflammatory effect
The main components of black tea color are theaflavin and theaflavin. Studies have shown that theaflavins are not only effective free radical scavengers and antioxidants, but also have significant antibacterial effects against botulinum bacillus, enterobacteriaceae, staphylococcus aureus, capsular bacillus, bacillus cereus. In addition, theaflavins have a certain inhibitory effect on influenza virus infection and rotavirus and enterovirus infections.
Second, lower blood pressure
The role of tea in lowering blood pressure has long been reported. Recently, Japan reported that theanine, a unique amino acid in tea, acts to suppress elevated blood pressure by activating dopaminergic neurons. Here, it has also been found that caffeine and catechins in tea leaves can relax blood vessel walls, increase the effective diameter of blood vessels, and reduce blood pressure through vasodilation. China’s Lou Qingqing found that tea pigments have significant anticoagulation, promote fibrinolysis, prevent platelet adhesion and aggregation, inhibit the proliferation of arterial smooth muscle cells, and significantly reduce triglyceride and low-density lipoprotein in serum of high-fat animals. Enhance serum high-density lipoprotein, and has a significant inhibitory effect on ACE enzyme, with antihypertensive effect.
Third, antioxidant, anti-aging, longevity effect
The theory of ageing free radicals believes that under normal physiological conditions, free radicals in the human body continue to be produced and are constantly being removed and are in equilibrium. Black tea contains not only rich antioxidant substances such as catechins, tea pigments, flavonoids, vitamin C, vitamin E, and D carotenoids, but also contains a large number of trace elements with antioxidant effects such as zinc and manganese. Copper (a constituent element of SOD) and selenium (a constituent element of GSHPX) and the like. The catechins, theaflavin, theanine and tea polysaccharides in black tea, especially the more complex flavonoids, etc., have the function of scavenging free radicals, and thus have the effects of anti-oxidation and delaying cell senescence.
Fourth, to help digestion, oily, along the stomach effect
Black coffee in the caffeine, vitamins, amino acids, phospholipids, etc. help the body digest, regulate fat metabolism, caffeine stimulation can improve the secretion of gastric juice, thereby increasing appetite and help digestion. Japanese scholars have proved through scientific tests that black tea has a strong oily greasy, digestion and other functions, which is why meat-eating people particularly like this type of tea.
The food structure of ethnic minorities in Northwest China is beef, mutton, and cheese. Therefore, there is a saying that "it would be better if there is no food for three days and no tea is available in a day." This is because tea leaves can be "fatlied" and "eliminated". Big relationship.
In addition, black tea can also improve the intestinal microenvironment, has a gastrointestinal function. There is a tradition in our country that old black tea is used to treat abdominal distention, dysentery, and inefficiency.
Five, diuretic detoxification, reduce alcohol and tobacco poisoning
The diuretic function of caffeine in black tea is achieved by the kidneys promoting the filtration rate of water in the urine. At the same time, the stimulatory effect of caffeine on the bladder can not only help diuresis, but also help sober up and relieve alcoholism. At the same time, tea polyphenols in black tea can not only precipitate nicotine in tobacco, but also be excreted with urine, but also can remove free radicals in smoke and reduce the toxic effects of smoke on human body. For heavy metal poisons, tea polyphenols have a strong adsorption effect, so drinking more tea can also alleviate the toxic effects of heavy metals.
Six, improve sugar metabolism, lower blood sugar, prevent diabetes
The tea polysaccharide complex in black tea is the main component of hypoglycemia. Tea polysaccharide complexes are often referred to as tea polysaccharides and are a complex and highly variable mixture of components. The results of determination of the content of tea polysaccharides in several kinds of teas show that black tea has the highest tea polysaccharide content and its component activity is stronger than other teas because of the glycosidases, proteases, and hydrolases in fermented teas. The effect of the formation of a relatively short length of the sugar chain and peptide chain is due to the short peptide chain longer peptide chain is more easily absorbed, and the biological activity is stronger, which may be fermented tea, especially black tea polysaccharide polysaccharides excellent hypoglycemic effect One of the reasons for other types of tea.
Seven, anti-cancer, anti-mutagenic effect
Cancer is one of the diseases that cause high human mortality in the world. Since the late 1970s, scientists all over the world have discovered that tea extracts have inhibitory effects on the occurrence of various types of cancer. Hunan University of Agricultural Science and Technology adopts cutting-edge high-throughput screening technology of modern drug screening to conduct high-throughput screening studies on black tea in tumor cell model SGC7901, demonstrating that black tea has a significant inhibitory effect on tumor cells.
Eight, regulate blood lipids, blood sugar, blood pressure, prevent hardening of the arteries
High levels of lipids can cause lipids to deposit on the walls of blood vessels, thus causing atherosclerosis and thrombosis. Black tea has good degradation of fat, anti-hemagglutination, profibrinolytic activity and significant inhibition of platelet aggregation. It also relaxes the blood vessel walls and increases the effective diameter of blood vessels, thereby inhibiting the atherosclerosis and atherosclerotic plaque on the inner wall of coronary arteries. Block formation. To achieve blood pressure, soften blood vessels, prevention and treatment of cardiovascular diseases.
Nine, supplement dietary nutrition
Anhua black tea contains rich nutrients, the most important being vitamins and minerals, in addition to protein, amino acids, carbohydrates and so on. For the residents of the northwestern region who have no choice of vegetables and fruits in their diets, such as cattle, lamb, and cheese, long-term drinking of Hunan Anhua black tea is an important source of essential minerals and various vitamins for the human body. .