1. Refreshing fatigue: According to medical experiments, caffeine in black tea stimulates the cerebral cortex, stimulates the nerve center, and promotes the refreshing and concentration of thinking, thus making the thinking response more acute and enhancing memory; It also has an exciting effect on the vascular system and the heart, strengthens the heartbeat, thus accelerating blood circulation to facilitate metabolism, and at the same time promoting sweating and diuresis, so as to accelerate the excretion of old and waste substances such as lactic acid (a substance that makes muscles feel tired) in the body and achieve the effect of eliminating fatigue. 2. Promoting fluid production and clearing heat: Drinking black tea in summer can quench thirst and relieve summer heat, because tea polyphenols, sugars, amino acids, pectin and so on. Tea in tea can react chemically with saliva and stimulate saliva secretion, thus making the mouth feel moist and cool; At the same time, caffeine controls the body temperature center of hypothalamus and regulates body temperature. It also stimulates the kidneys to promote the excretion of heat and dirt and maintain the physiological balance in the body.
Besides, black tea is an excellent sports drink. In addition to relieving summer heat, quenching thirst and replenishing water, if you drink it before an exercise that requires physical strength and endurance (such as running a marathon), because caffeine in tea leaves has a refreshing effect, it can also make the body burn fat to supply heat energy while retaining liver vinegar during exercise, so people's endurance is stronger. 3. Diuretion: Under the joint action of caffeine and aromatic substances in black tea, the renal blood flow increases, the glomerular filtration rate increases, the renal microvascular dilates, and the renal tubules are inhibited from reabsorption of water, thus contributing to the increase of urine volume. This is beneficial to eliminate lactic acid, uric acid (related to gout), excessive salt (related to hypertension), harmful substances and so on. And relieve edema caused by heart disease or nephritis. 4. Anti-inflammatory and sterilization: Polyphenols in black tea have anti-inflammatory effects. Experiments show that catechins can combine with single-celled bacteria to coagulate and precipitate protein, thus inhibiting and eliminating pathogenic bacteria. Therefore, for patients with bacillary dysentery and food poisoning, drinking black tea is quite beneficial, and strong tea is also commonly used by the people to smear wounds, bedsores and athlete's foot. 5. Detoxification: According to experiments, tea polyphenols in black tea can adsorb heavy metals and alkaloids, and make them precipitate and decompose, which is good news for modern people whose drinking water and food are polluted by industry. 6. Strengthening bones: On May 3, 2002, the American Medical Association published a survey of 497 men and 540 women for more than 10 years, pointing out that people who drink black tea have strong bones, and polyphenols in black tea (also in green tea) have the activity of inhibiting substances that destroy bone cells. The contents of polyphenols in various foods are as follows: black tea-65,438+07.4.
In order to prevent and treat female osteoporosis, it is suggested to drink a small cup of black tea every day for several years, and the effect is obvious. If lemon is added to black tea, the bones will be strengthened and the effect will be stronger. Various fruits can also be added to black tea, which can play a synergistic role. 7. Anti-oxidation and anti-aging: In the past five years, the US government has funded more than 65,438+050 studies on green tea and black tea and their chemical compositions. The results show that antioxidants in green tea and black tea can completely destroy the propagation path of chemicals in cancer cells. Dr Murray Mitelman, director of vascular epidemiology at Beth Israel Deaconess Medical Center in Boston, said, "Black tea has roughly the same efficacy as green tea, but the antioxidants in black tea are much more complicated than green tea, especially beneficial to the heart." . American magazines report that black tea has stronger anti-aging effect than garlic, broccoli and carrots. 8. Nourishing the stomach and protecting the stomach: If you don't eat and drink green tea, people will feel uncomfortable in the stomach. 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. Under the action of oxidase, tea polyphenols undergo enzymatic oxidation reaction, and the content decreases, thus reducing the stimulation to the stomach. 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. 9. Anti-cancer: It is very popular that tea has anti-cancer effect, and researchers all over the world have done a lot of exploration on it, but it is generally believed that the anti-cancer effect of tea is mainly manifested in green tea, but now new progress has been made. According to media reports (June 2000), a recent study by the Tea and Health Research Office of Hunan Medical University found that black tea, like green tea, has a strong anti-cancer effect. Traditionally, most of the red tea polyphenols fermented by green tea have been oxidized to form tea pigment, which may reduce its anticancer activity. In order to solve this problem, experts from the Tea and Health Research Office of Hunan Medical University started with molecular biology. After more than a year's research, they believe that the anti-cancer effect of black tea tea pigment mainly occurs in the early stage of cell proliferation and differentiation, that is, the early stage of DNA synthesis, thus confirming the anti-cancer effect of black tea. 10. relaxing blood vessels is good for the heart: there is also a recent study in the American medical community related to black tea. It was found that the vasodilation function of patients with heart disease could be improved from 6% to 10% by drinking 4 cups of black tea every day. After stimulation, the diastolic degree of normal people will increase by 13%.
The study, conducted by Boston University, reported that although the curative effect of black tea can not restore the blood circulation of patients to normal, it can help improve blood vessels. Researchers say that the benefits of black tea are equivalent to cholesterol-lowering drugs, exercise and vitamin C, because black tea contains an antioxidant called Flavornoids, which can reduce low-density lipoprotein (LDL), also known as "bad cholesterol". However, due to the short life of edible spices, to achieve the effect of lowering cholesterol, we must often absorb foods containing this ingredient. The osaka city university experiment in Japan pointed out that after drinking black tea 1 hour, the blood flow velocity of the heart increased, which confirmed that black tea had a strong role in preventing and treating myocardial infarction.