1. Refreshing and relieving 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 reaction 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, shengjin Qingre: Drinking black tea in summer can quench thirst and relieve summer heat, because tea polyphenols, sugars, amino acids, pectin and so on. The saliva contained in tea will react chemically, stimulate saliva secretion, and produce a moist mouth and a cool feeling.
At the same time, caffeine controls the 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.
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. People often use strong tea 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. 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 Morimi Tellman, director of vascular epidemiology at Beth Israel Deaconess Medical Center, 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.
7. 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. 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.
8. 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, and new progress has been made. Studies have found that black tea, like green tea, also has a strong anti-cancer effect.
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