Black tea is completely fermented tea, but green tea is not. Black tea is warm, dispelling cold and warming stomach, while green tea is cool, clearing heat and refreshing; Indeed, their manufacturing processes are different. The processing of green tea can be simply divided into three steps: enzyme fixation, rolling and drying, among which the key lies in the first process of primary production, namely enzyme fixation. Fresh leaves are inactivated by enzyme activity, and the chemical components contained in them are basically unaffected by enzymes, and change through heat, thus forming the quality characteristics of green tea. The characteristics of green tea retain more natural substances of fresh leaves. Among them, tea polyphenols and caffeine retain more than 85% of fresh leaves, about 50% of chlorophyll, and less vitamin loss, thus forming the characteristics of green tea with "clear soup color and strong taste convergence". Scientific research shows that green tea has certain anti-aging, anti-cancer, anti-cancer, sterilization and anti-inflammatory effects. Black tea: Black tea in China includes Kung Fu black tea, broken black tea and small black tea. Their production methods are similar, and they all have four processes: withering, rolling, fermentation and drying. The quality characteristics of all kinds of black tea are red soup and red leaves. The formation of color, aroma and taste has a similar chemical change process, but the conditions and degrees of change are different. Black tea is called "black tea" when it is created. During the processing of black tea, a chemical reaction centered on the enzymatic oxidation of tea polyphenols took place, and the chemical components in fresh leaves changed greatly. Tea polyphenols decreased by more than 90%, resulting in new components such as theaflavins and thearubigins. Compared with fresh leaves, the aroma substances increased obviously. Therefore, black tea has the characteristics of black tea, red soup, red leaves and glycol. The main varieties of China black tea are: Qimen black tea-produced in Qimen, Zhide and Fuliang, Jiangxi; Dianhong-produced in Fohai, Shunning and other places in Yunnan; Huohong-produced in Lu 'an, Huoshan and other places in Anhui; Su Hong-produced in Yixing, Jiangsu; Yue Hong-produced in Anhua, Xinhua, Taoyuan and other places in Hunan; Chuanhong-produced in Yibin, Gaoxian and other places in Sichuan; Wu Hong-produced in Guangdong Yingde and other places. Among them, Qimen black tea is the most famous'; It's good to drink green tea (with chrysanthemum rock sugar) in summer without getting angry! ! Green tea is a kind of tea without fermentation, that is, fresh leaves are spread and dried, and then made into green tea. Rinse your mouth with tea after meals, and your spleen and stomach will clean themselves up. People who have meat between their teeth will give up tea. If a thirsty person takes a few sips of tea, his tongue will feel sweet and his thirst will stop. Although jade liquid is nectar, it is hard to compare with it. Studies have shown that tea polyphenols and tea pigments. It can inhibit the metabolic activation of carcinogens, inhibit the abnormal proliferation of tumors, interrupt or prevent lipid peroxidation, and scavenge superoxide radicals and hydroxyl radicals, thus inhibiting atherosclerosis. Tea can improve blood vessels. In fact, theaflavins inhibit angiotensin I converting enzyme, while caffeine and catechin can relax blood vessels and relax them. Whenever people feel bored and depressed after eating greasy food, I advise you that a cup of strong tea will be greasy and clean their breasts and abdomen. In addition, tea can also cure wind disease, cold, cough, diuresis, eyesight improvement and fire reduction. Strong teeth and many other benefits. Stir-fried in hot pot to keep its green characteristics. Drinking green tea in summer can refresh the mind, relieve fever and thirst, help digestion and relieve boredom, sterilize and diminish inflammation, prevent caries and strengthen teeth, lose weight and keep fit, regulate stomach and diuresis, improve eyesight and clear heart, quit smoking and sober up, reduce blood pressure and lipid, reduce cancer, increase blood vessel wall elasticity and prevent atomic radiation damage. It can't be compared with today's drinks. ! ! Black tea is "one of the beverages rich in flavonoids, which can eliminate free radicals, have anti-acidification effect and reduce the incidence of myocardial infarction". Drinking black tea with vegetables, fruits, butter, milk and eggs at the same time is called a healthy and reasonable eating habit. But at the same time, we should also pay attention to avoid eating too much calories and sugar. Black tea also has various antibacterial effects to prevent colds. The effect of black tea is 1. Diuretic effect Under the combined action of caffeine and aromatic substances in black tea, renal blood flow increases, glomerular filtration rate increases, renal microvascular dilates, and renal tubules are inhibited from reabsorption of water, thus promoting 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. 2. Anti-inflammatory and bactericidal effects 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. 3. Detoxification Efficacy 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. 4. The effect of refreshing and relieving fatigue 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. The effect of promoting fluid production and clearing heat Drinking black tea in summer can quench thirst and relieve summer heat, because polyphenols, sugars, amino acids and pectin in tea react chemically with saliva, which stimulates saliva secretion, makes the mouth feel moist and produces a cool feeling; 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. For the various beneficial effects of green tea on human body and mind'1. Green tea anti-aging antioxidants contained in green tea help to fight aging. Because in the process of human metabolism, if it is over-oxidized, it will produce a lot of free radicals, which are easy to age and cause cell damage. SOD (Superoxide Dismutase) is a kind of free radical scavenger, which can effectively remove excess free radicals and prevent the harm of free radicals to human body. Catechins in green tea can significantly improve SOD activity and scavenge free radicals. 2. The antibacterial research of green tea shows that catechins in green tea can inhibit some bacteria that cause human diseases, and at the same time, it will not harm the reproduction of beneficial bacteria in the intestine, so green tea has the function of whole intestine. Studies have shown that tea polyphenols can eliminate excessive harmful free radicals in the body, regenerate efficient antioxidant substances such as α-VE, VC, GSH and SOD in the human body, thus protecting and repairing the antioxidant system, which has a significant effect on enhancing immunity, preventing cancer and preventing aging. Drinking green tea for a long time can reduce blood sugar, blood lipid and blood pressure, thus preventing cardiovascular and cerebrovascular diseases. The medical research team of Showa University in Japan diluted 1 ml tea polyphenols solution to 1 of the concentration of ordinary tea, and put it into 10000 highly toxic Escherichia coli 0- 157. Five hours later, all the bacteria died, leaving none. 3. Animal experiments made by green tea scientists show that catechins in tea can reduce the contents of total cholesterol, free cholesterol, low-density lipoprotein cholesterol and triglyceride in plasma, and at the same time increase high-density lipoprotein cholesterol. Human experiments show that it can inhibit platelet aggregation and reduce the incidence of arteriosclerosis. Green tea contains flavonol, which has antioxidant effect, prevents thrombosis and platelet aggregation, and reduces cardiovascular diseases. 4. Green tea slimming and fat reduction Green tea contains theophylline and caffeine, which can activate protein kinase and triglyceride lipolytic enzyme through various functions, reduce the accumulation of fat cells, and thus achieve the effect of losing weight. 5. Green tea can prevent dental caries and remove bad breath. Green tea contains fluorine, in which catechins can inhibit the action of dental caries bacteria and reduce the occurrence of dental plaque and periodontitis. Tannic acid contained in tea has bactericidal effect, which can prevent food residues from breeding bacteria, so it can effectively prevent bad breath. 6. Green tea anti-cancer Green tea has an inhibitory effect on some cancers, but its principle is limited to the inference stage. Drinking more tea is bound to have a positive encouraging effect on preventing cancer. 7. Green tea whitening and ultraviolet protection experts found in animal experiments that catechins in green tea can resist skin cancer caused by UV-B. 8. Green tea can improve indigestion.