There are too many kinds of water. Mineral water, purified water, space water, distilled water, oxygen-rich water, all kinds of drinks are dazzling, so there is no choice. Pure water, because all impurities in water are removed, has the advantages of purity, sanitation and harmlessness, good taste and thirst quenching. However, because the impurities in the water have been removed, some substances that may be beneficial to the human body have also been filtered out. Drinking mineral water can supplement some minerals to the body, such as lithium, selenium and metasilicic acid. This is certainly beneficial. However, mineral absorption in drinking water is very limited. Plain water, but if conditions permit, tea is the best: the benefits of drinking tea? The World Health Organization investigated the advantages and disadvantages of drinks in many countries, and finally concluded that tea is the best drink for middle-aged and elderly people. According to scientific determination, tea contains 10 kinds of vitamins, including nearly 300 kinds of ingredients such as protein, fat, tea polyphenols, caffeine and lipopolysaccharide, which can regulate physiological functions and play a variety of health care and pharmacological effects. Because tea can prevent the increase of sterols in human body and prevent myocardial infarction, tea polyphenols can also remove excessive free radicals, inhibit and kill pathogenic bacteria. In addition, tea has the functions of refreshing, eliminating fatigue and resisting bacteria. This is necessary for middle-aged people. Euromonitor can also purify water and reduce the harm of radioactive substances to human body. Therefore, people living in cities should drink tea regularly, especially when the natural environment is seriously polluted. There are many benefits of drinking tea, which can be summarized as 14: (1) Tea can refresh people and enhance their thinking and memory abilities. (2) Tea can eliminate fatigue, promote metabolism and maintain the normal functions of the heart, blood vessels and gastrointestinal tract. (3) Drinking tea is of great benefit to the prevention of dental caries. A survey in Britain shows that children who drink tea regularly can reduce their dental caries by 60%. (4) Tea contains many trace elements beneficial to human body. (5) Tea can inhibit malignant tumor, and drinking tea can obviously inhibit the growth of cancer cells. (6) Drinking tea can inhibit cell aging and prolong life. The anti-aging effect of tea is more than 0/8 times that of vitamin E. (7) Drinking tea can delay and prevent the formation of lipid plaque in vascular intima and prevent arteriosclerosis, hypertension and cerebral thrombosis. (8) Drinking tea can excite the central nervous system and enhance exercise ability. (9) Drinking tea has a good slimming and beauty effect, especially oolong tea. (10) Drinking tea can prevent senile cataract. (1 1) Tannic acid contained in tea can kill many kinds of bacteria, so it can prevent and treat stomatitis, pharyngolaryngitis, enteritis, dysentery, etc. Drinking tea can protect people's hematopoietic function. Tea contains anti-radiation substances. Drinking tea while watching TV can reduce the harm of TV radiation and protect your eyesight. (13) Drinking tea can maintain the normal acid-base balance of blood. Tea contains alkaloids such as caffeine, theophylline, theobromine and xanthine, and is an excellent alkaline drink. Tea can be quickly absorbed and oxidized during the extraction process, resulting in high concentration of alkaline metabolites, thus neutralizing acidic metabolites in the blood in time. (14) heatstroke prevention and cooling. After drinking hot tea for 9 minutes, the skin temperature drops 1-2 degrees Celsius, which makes people feel cool and dry, while after drinking cold drinks, the skin temperature drops slightly. Reasonable drinking tea is beneficial to human body, while unreasonable drinking tea is harmful to human body. Drinking tea depends on physical fitness. Chinese medicine believes that people's physique can be divided into dry heat and deficiency cold, and tea can be divided into coolness and warmth through different production processes, so it is also important to drink tea with different constitutions. People with hot and dry constitution should drink herbal tea, while those with deficient and cold constitution should drink warm tea. It is best to drink black tea at night. Because green tea belongs to non-fermented tea, it has high content of tea polyphenols, maintains its original properties and is irritating; Black tea is a completely fermented tea. Although the content of tea polyphenols is low, it is mild after "aging" and suitable for drinking at night. Especially for people with weak spleen and stomach, adding some milk when drinking black tea can play a certain role in warming the stomach. However, people who are easily excited or sensitive, have poor sleep and are weak should drink less or not drink tea at night. In addition, when drinking tea at night, you should put less tea leaves and don't make the tea too strong. It is best to drink tea after meals, because drinking tea on an empty stomach will harm your health, especially for people who don't drink tea often, it will inhibit the secretion of gastric juice, hinder digestion, and seriously cause palpitations, headaches and other "tea drunk" phenomena. Correct brewing method of green tea: 1. When brewing green tea, the water temperature should be controlled at about 80℃ ~ 90℃. If green tea powder is brewed, it can be brewed with warm water of about 40℃ ~ 60℃. The serving size is 2g of green tea powder and 450ml of boiled water. Don't drink the first tea, just shake it after pouring hot water. 3. The brewed tea should be drunk within 30 minutes to 60 minutes, otherwise the nutrients in the tea will become unstable. 4. Green tea powder should not be soaked too thick, otherwise it will affect the secretion of gastric juice, and it is best not to drink it on an empty stomach. Be sure to wash away the heavy metals in tea scale in time: According to relevant research, tea scale contains many kinds of heavy metals such as cadmium, lead, iron, arsenic and mercury, which will be brought into human body when drinking tea, and will combine with protein, fat, vitamins and other nutrients in food to form insoluble sediments, which will hinder the absorption of nutrients. These oxides can also cause pathological changes and dysfunction of human nervous system, digestive system and urinary hematopoietic system, especially arsenic and cadmium can cause cancer and cause fetal malformation. Therefore, anyone who has the habit of drinking tea should always clean up the tea dirt on the inner wall of the tea set in time. Old people get up early to drink light tea: some old people like to get up early to drink a cup of strong tea, which is actually bad for their health. Because drinking strong tea on an empty stomach in the morning will not only cause gastrointestinal discomfort, loss of appetite, but also damage the normal function of the nervous system. When the elderly drink tea in the morning, they can pour the first sip of tea and drink two sips of tea. It is better to add a little sugar and a proper amount of white chrysanthemum to tea. Tea is a natural healthy drink. Studies have shown that drinking tea can quench thirst, help digestion, resolve phlegm, improve eyesight, induce diuresis, relieve boredom, relieve boredom, prevent cancer, refresh oneself and prolong life. 1, cancer prevention: Studies have confirmed that tea polyphenols can block the formation of carcinogenic nitroso compounds in human body. Green tea has the strongest blocking effect, and the blocking rate is above 90%. Followed by scented tea, oolong tea and black tea. It was found that soaking tea with 1g twice and drinking it with 150ml of water each time could completely block the synthesis of nitroso compounds in human body. 2. Radiation protection: Studies show that polyphenols, fatty acids, vitamins C and A contained in tea have radiation protection functions. Drinking tea can effectively prevent radiation-induced leukopenia. For cancer patients receiving radiotherapy, taking soluble tea can eliminate or alleviate the adverse reactions such as nausea, vomiting, loss of appetite and diarrhea after radiotherapy. 3. Prevention of dental caries: Studies have shown that drinking tea, gargling with tea soup and brushing teeth can prevent dental caries. People who drink oolong tea regularly have a decrease of about 60% in the incidence of dental caries. 4. Prevention and treatment of cardiovascular diseases. Studies have confirmed that tea tannin can inhibit the proliferation of arterial smooth muscle cells, and obviously has the functions of anticoagulation, promoting fibrinolysis, anti-plaque formation, reducing capillary fragility and blood viscosity. Therefore, it has the functions of preventing hypertension and atherosclerosis, improving blood circulation and preventing thrombosis. Generally, you can make 5 grams of green tea a day. 5. Prevention and treatment of intestinal diseases: Organic acids such as fatty acids and aromatic acids contained in tea have bactericidal effects and can be used to treat intestinal diseases such as bacillary dysentery, chronic ulcerative colitis and ileitis. 9 grams of tea, decocted. 6. Promoting fluid production to quench thirst and relieve summer heat: Because polyphenols, sugars, pectin and amino acids in tea have chemical changes with saliva in the mouth, it can make the mouth moist and produce a cool feeling. Caffeine can regulate body temperature, so drinking tea can quench thirst and relieve summer heat. Even in hot summer, drinking hot tea can quench thirst better than other drinks, and the cooling time lasts longer. 7. Reduce fat and lose weight: Studies have confirmed that caffeine, inositol, folic acid and aromatic substances in tea can enhance gastric juice secretion and regulate fat metabolism, especially oolong tea has a good decomposition effect on protein and fat, so drinking tea can reduce weight. Generally, 5 grams of tea leaves are soaked in water every day, and it will take effect after more than one month. 8. Rinse your mouth with tea after meals: Studies show that tea is rich in alkaline substances, and its functions of decontamination, deodorization and greasy removal are far stronger than ordinary water. After three meals a day, especially after you have had a full meal with fishy smell and mellow wine, gargling with tea can clean your mouth and get rid of fishy smell and boredom. Tea can also kill some bacteria in the mouth and prevent oral inflammation. Tea can also deodorize, especially wine, cigarettes and garlic. 9. Refreshing the brain, benefiting thinking and relieving fatigue: Studies have confirmed that caffeine in tea can excite the central nervous system, make the mind clear and quick-thinking, accelerate blood circulation, activate bones and muscles, promote metabolism and relieve fatigue. 10, Longevity and Anti-aging: Studies show that tannins contained in green tea can control lipid peroxides produced in human body and prevent aging. Tea tannin can control 74% fatty acid peroxidation, which greatly exceeds the effect of vitamin E, so drinking tea often can prolong life. What kind of tea has the best anticancer effect In recent years, scientists in China first discovered that China tea can prevent nitroso compounds from causing cancer to human beings. Nitroso compounds are relatively certain human carcinogens. Researchers believe that green tea, pressed tea, scented tea, oolong tea and black tea can block the formation of nitroso compounds. Animal experiments show that Fujian tea, Tieguanyin tea, Hainan green tea, black broken tea and Hangzhou fried green tea can inhibit the occurrence of esophageal tumors in rats. Tea can not only prevent the formation of nitroso compounds, but also inhibit the carcinogenic effect of nitroso compounds. Scientists also found that among all kinds of teas, green tea has the best anticancer effect. What effect does tea have on human health? Judging from the curative effect on diseases, drinking green tea is better than drinking black tea. Scented tea is generally made of green tea, so it has the same effect as green tea. But the elderly, especially those with habitual constipation, drinking green tea often aggravates constipation. The Air Force Medical College found that black tea has the most significant life-prolonging effect in the study of screening anti-aging drugs in life-span test. Generally speaking, teenagers and children should gargle with tea or drink light tea; Adolescent development is vigorous, so it is advisable to drink green tea. Black tea is warm and should not be too strong when drinking. Girls are often agitated before and after menstruation and menopause. Drinking scented tea is helpful for soothing the liver and relieving depression, regulating qi and regulating menstruation. Prostatitis or prostatic hypertrophy, appropriate use of scented tea; Women should drink black tea after delivery, and it is better to have brown sugar at home; People with stomach problems should use honey tea; People with liver disease should use scented tea; Black tea is the first choice for manual workers; For writers, green tea is more suitable; If you want to lose weight and fat, oolong tea and Pu 'er tea are the best. Japanese women call oolong tea "a panacea for beauty and health". French women, especially young girls, attach great importance to physical beauty. They called Yunnan Pu 'er tea "scraping camellia oleifera" and "waste tea" and said, "Do you want it to be beautiful? Then you have to drink Pu 'er tea. In addition, Pu 'er tea does not harm the gastrointestinal tract, while Oolong tea has diuretic effect and less caffeine content, which is suitable for men, women and children.