The efficacy of black tea

1, diuretic effect of black tea

Under the combined 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 reabsorption of water by renal tubules is inhibited, thus contributing to the increase of urine output. 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.

2. Anti-inflammatory and bactericidal effects of black tea

Polyphenols in black tea have anti-inflammatory effects. Experiments show that catechins can combine with unicellular 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.

3. Detoxification of black tea

According to experiments, tea polyphenols in black tea can adsorb heavy metals and biological alkaloids, and make them precipitate and decompose, which is good news for modern people whose drinking water and food are polluted by industry.

4, black tea refreshing effect.

Through medical experiments, it is found that 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.

5, black tea has the effect of clearing away heat.

Drinking black tea in summer can quench thirst and relieve summer heat, because polyphenols, sugars, amino acids and pectin in tea react with saliva to stimulate saliva secretion and make 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.

In addition, black tea also has the functions of preventing caries, invigorating stomach and moistening intestines, helping digestion, delaying aging, lowering blood sugar, lowering blood pressure, lowering blood fat, resisting cancer and radiation. Black tea is also an excellent sports drink. In addition to relieving summer heat, quenching thirst and replenishing water, if you drink it before sports (such as marathon running) that require physical strength and endurance, because caffeine in tea has a refreshing effect, it can promote the body to burn fat to supply heat energy while retaining liver vinegar during sports, so people's endurance is stronger.

The efficacy of green tea

1, anti-aging

It is helpful to delay aging. Tea polyphenols have strong antioxidant and physiological activity, and are free radical scavengers in human body. Studies have proved that 1 mg tea polyphenols is equivalent to 9 micrograms of superoxide dismutase in scavenging excessive free radicals harmful to human body, which is much higher than other similar substances. Tea polyphenols can block lipid peroxidation and remove active enzymes. According to the test results of Tomoyo in Ota, Japan, it is confirmed that the anti-aging effect of tea polyphenols is 18 times stronger than that of vitamin E.

2. Suppress diseases

Tea polyphenols can inhibit cardiovascular diseases and play an important role in human fat metabolism. The human body has cardiovascular diseases such as high cholesterol and triglycerides, such as fat deposition on the inner wall of blood vessels and atherosclerotic plaques formed after vascular smooth muscle cells proliferate. Tea polyphenols, especially catechins ECG and EGC in tea polyphenols and its oxidation products theaflavins, are helpful to inhibit this mottled proliferation, reduce the formation of fibrinogen that enhances coagulation viscosity, make coagulation clear, and thus inhibit atherosclerosis.

3. Anti-cancer

Helps prevent and fight cancer. Tea polyphenols can block the synthesis of carcinogens such as ammonium nitrite in the body, which can directly kill cancer cells and improve the immunity of the body. According to relevant data, tea polyphenols in tea are beneficial to the prevention and adjuvant treatment of cancers such as gastric cancer and intestinal cancer.

4. Antiviral bacteria

Tea polyphenols have strong convergence, obvious inhibition and killing effects on pathogenic bacteria and viruses, and obvious anti-inflammatory and antidiarrheal effects. Many medical units in China use tea preparation to treat acute and chronic dysentery, amebic dysentery and influenza, and the cure rate is about 90%.

5. Beauty and skin care

Tea polyphenols are water-soluble substances, which can remove facial greasy, astringe pores, sterilize and disinfect, resist skin aging, and reduce the damage of ultraviolet rays in the sun to the skin.

6, refreshing.

Caffeine in tea can stimulate the central nervous system of human body, enhance the excitement process of cerebral cortex, and has the functions of refreshing the brain, clearing away heart fire and calming the nerves. It also has a certain effect on relieving migraine.

7, diuresis to relieve fatigue

Conducive to diuresis and relieve fatigue. Caffeine in tea can stimulate the kidney, promote the rapid excretion of urine, improve the filtration rate of the kidney and reduce the retention time of harmful substances in the kidney. Caffeine can also eliminate excessive lactic acid in urine, which helps to eliminate fatigue as soon as possible.

8. Relieve fatigue

Green tea contains powerful antioxidants and vitamin C, which can not only eliminate free radicals in the body, but also secrete hormones against stress. A small amount of caffeine contained in green tea can stimulate the central nervous system and cheer up the spirit. Because of this, we suggest drinking green tea in the morning to avoid affecting sleep.

9, tooth protection and vision

The fluorine content in tea which is helpful for protect teeth and improving eyesight is very high, and that fluorine content per100g of dry tea is10mg-15mg, of which 80% is a water-soluble component. If everyone drinks 10g tea every day, they can absorb 1mg- 1.5mg of water-soluble fluoride. Moreover, tea is an alkaline beverage, which can inhibit the reduction of calcium in the human body, help prevent dental caries, protect teeth and strengthen teeth. The experiment of "gargling tea after drinking" among primary school students can reduce the incidence of dental caries by 80%. Among cataract patients, 28.6% have the habit of drinking tea; 7 1.4% have no habit of drinking tea. This is because vitamin C and other ingredients in tea can reduce the turbidity of eyes, and drinking tea often has a positive effect on reducing eye diseases, protecting eyes and improving vision.

10, reducing blood lipid

Helps to lower blood fat and help digestion. In the Tang Dynasty's Herbal Supplement, it was recorded that the effect of tea was "to lose weight after eating for a long time". There is a saying among the ethnic minorities in China's border areas that "tea is indispensable for a day". Because tea helps digestion and reduce fat, in today's fashionable language, it is helpful to "lose weight". This is because caffeine in tea can increase gastric juice secretion and help digestion. In addition, green tea is rich in catechins, which helps to reduce abdominal fat.