The benefits of tea
cancer prevention
Cancer has now become one of the biggest threats to human health. Tea contains catechins, especially catechins in green tea, accounting for 15%~20% of tea. The in vitro experiment of Japanese scientist Yukio Hatano on catechins proves that flavonoids such as catechins have anti-cancer effects. Tea also contains vitamins C and E, which have auxiliary anti-cancer effect.
protect against radiation
Tea contains polyphenols, lipopolysaccharide, vitamin C and carotene, which together can absorb radioactive strontium and excrete it in the form of feces. The components in tea can also prevent external irradiation damage caused by proton beam, X-ray or γ-ray, thus effectively preventing the harm of radioactive substances to human body.
prevention of dental caries
Drinking tea, especially oolong tea, can prevent tooth decay, because the fluorine content in oolong tea is high, and fluoride ions have great affinity for calcium in teeth. It's like putting a protective layer on teeth to enhance their ability to prevent acid and caries. People who drink oolong tea regularly have a 60% lower tooth decay rate than ordinary people.
Prevention of cardiovascular diseases
Drinking tea can reduce the risk of cardiovascular disease. The main cause of cardiovascular diseases such as hypertension and coronary heart disease is atherosclerosis caused by hyperlipidemia and high cholesterol. Drinking tea can effectively reduce the level of blood lipid and cholesterol, because tea polyphenols can inhibit the proliferation of arterial smooth muscle cells, and obviously have the functions of anticoagulation, promoting fibrinolysis, preventing the formation of blood spots, reducing capillary fragility and blood viscosity.
Prevention of intestinal diseases
Drinking tea regularly is equivalent to drinking a dose of good medicine for intestinal diseases. Tea polyphenols in tea can combine with unicellular bacteria, coagulate protein and kill bacteria. Salmonella typhi and Escherichia coli will lose their activity if they are soaked in strong tea. Because organic acids such as fatty acids and aromatic acids in tea have bactericidal effects.
disinfect
Studies have shown that tea can inhibit the growth and reproduction of harmful bacteria such as Salmonella, Staphylococcus, Bacillus anthracis, Bacillus subtilis, Diphtheria and Proteus. It is reported that 14 hours can kill staphylococcus; Cholera bacteria can be completely killed within 2 hours. Green tea has a good therapeutic effect on beriberi in Hong Kong, because thick green tea soup can effectively kill filamentous bacteria that cause beriberi. Every night, the feet are soaked in thick green tea soup, which can be cured in a period of time.
Quench thirst and relieve summer heat
Drinking a cup of green tea in hot summer can make you feel full of saliva and cool all over, which is a good way to relieve summer heat. Because polyphenols, sugars, pectin and amino acids in tea are equal to saliva, the mouth is moist and produces a cool feeling. In addition, caffeine in tea can regulate the body temperature center in the human body, thus regulating the body temperature.
For health, rinse your mouth after meals.
Gargling after meals can eliminate bad breath, which is caused by inflammation, indigestion and excessive stomach fire in the mouth. Aromatic substances in tea can eliminate bad breath, and gargling after meals makes the mouth feel refreshing, comfortable and not greasy. Alkaline substances in tea can remove dirt, odor and greasy; Tea can also inhibit and kill pathogenic bacteria such as Streptococcus, Lactobacillus, Escherichia coli and Staphylococcus, which are usually hidden in the oral cavity. Gargling after meals can fight against carcinogens in the mouth, and tea tannic acid has anti-cancer effect.
Treat urinary system inflammation
Caffeine, theobromine and theophylline contained in tea have diuretic effect, which can enhance heart and kidney function, especially aminophylline. At the same time of diuresis, tea also has the function of sterilization and anti-inflammation. Congratulations. Therefore, drinking tea regularly can alleviate pyelonephritis, cystitis and urinary tract infection.
Brighten the eyes
Drinking tea regularly can prevent and treat dry eye, night blindness, cataracts and vision loss caused by watching TV, thus protecting vision. Tea is rich in carotene, which can maintain the normal function of epithelial tissue and prevent keratinization and hyperplasia. This degeneration and proliferation will lead to keratinization of lacrimal gland cells, stop the secretion of tears, and lead to dry eye. . After carotene is converted into vitamin A in human body, rhodopsin is synthesized with protein in retina, which can enhance photoreceptor of retina and prevent night blindness.
Reduce the harm of smoking
Nicotine in tobacco is a highly toxic alkaloid. Nicotine enters the human body with smoke. When the content reaches a certain concentration, it can cause urine poisoning, dizziness and general malaise. At this time, if you drink a cup of strong tea, the caffeine in the tea can effectively resist the toxicity of nicotine and relieve symptoms.
supplement nutrition
Tea is rich in nutrition. Every 100g of tea contains protein 25.9g, fat 3g, carbohydrate 53g, calcium 3 1 1mg, phosphorus 360mg, iron 39.5mg, carotene 54.6mg, vitamin B 100 ~ 500mg and vitamin B/kloc. These nutrients are necessary for human tissues to maintain normal physiological functions. People are not familiar with manganese, and its physiological function is no less than that of minerals such as iron and zinc. The human body needs to take 3.8 grams of manganese from food every day to meet the needs of metabolism. Vegetarian foods such as wheat bran and spinach contain a lot of manganese, but the absorption rate is low. The absorption rate of manganese in animal liver, kidney and fish food is high, but the content is low. Tea has obvious advantages in supplementing manganese. The manganese content in a cup of strong tea is as high as 1 mg. Drinking 3 cups a day plus other foods is not a problem for the human body to supplement manganese.
Reduce fat and lose weight
Caffeine, inositol, folic acid, pantothenic acid and aromatic substances in tea can increase gastric juice secretion, regulate fat metabolism and reduce blood lipid and cholesterol. All drinking tea can reduce blood fat and lose weight. Among them, oolong tea has obvious decomposition effect on protein and fat.
recover one's spirit
Drinking tea can speed up brain operation, eliminate fatigue and improve work efficiency. Because the caffeine in tea is absorbed by the human body, it can not only excite the central nervous system, keep a clear head and be quick-thinking, but also accelerate blood circulation, activate bones and muscles, promote metabolism and eliminate fatigue.
Prolong life
Drinking tea regularly can prolong life, especially green tea. Tea tannins contained in green tea can control the over-acidified lipids produced by human body and prevent aging. A Japanese scientist compared the over-acidification effect of vitamin E and tannin on fatty acids, and concluded that it was tea tannin, and its effect was 19 times that of vitamin E. Therefore, the anti-aging effect of tea tannin was far better than that of vitamin E.
Regulating thyroid gland
Tea contains iodine, which can effectively regulate thyroid function. Because iodine deficiency will lead to abnormal thyroid secretion function, which will lead to abnormal human life activities, and the consequences are very serious.
The disadvantages of drinking tea
Cause insomnia
Drinking too much tea at a time can lead to nervous excitement and insomnia. Because theophylline has a strong diuretic effect, drinking too much tea will lead to more nocturia; In addition, tea polyphenols also have the function of exciting nerves. Drinking tea too hard or too much at night will lead to excessive mental excitement and affect sleep.
Cause loss of appetite
Tannic acid in strong tea can coagulate protein, and combine with vitamin B 1, which leads to the inability of human body to absorb protein and the lack of vitamin B 1, which leads to loss of appetite, nervousness and fatigue.
Avoid eating with tonics.
When taking supplements such as ginseng, tremella and donkey-hide gelatin, if you drink tea, the chemical components such as alkaloids and organic acids in tea will greatly reduce the utilization efficiency of supplements; In addition, do not use tea when taking traditional Chinese medicine or western medicine, so as not to reduce the curative effect.
The hidden danger of pregnancy caused by strong tea
Drinking strong tea in pregnant women will do harm to the fetus. Tea contains 2%~5% caffeine, and about 0.06mg caffeine per 500ml strong tea water. Caffeine has an exciting effect, which will increase fetal movement and even endanger the growth and development of the fetus. Tannic acid in tea can combine with iron in food to form compounds that cannot be absorbed by human body. Excessive drinking of black tea by pregnant women will cause cognitive anemia and even leave a hidden danger of congenital iron deficiency anemia to the fetus.
People with a cold and fever should not drink it.
Theophylline in tea will increase the temperature of human body and aggravate fever; In addition, due to the diuretic effect of theophylline, it will promote the drug to be excreted, which may reduce the effect of antipyretic drugs.
Calculous
Oxalic acid in tea can combine with calcium to form calcium oxalate insoluble in body fluids. In the long run, it will lead to stones, and patients with lithiasis should be careful to drink black tea.
Taboo of drinking tea
Don't drink too much tea. If you drink a lot of tea a day, it will easily lead to the accumulation of tea in the intestine and affect the normal activity of the diaphragm. And drinking a lot of tea will lead to a large increase in water, which will also put a lot of pressure on the heart.
Strong tea is forbidden when drinking tea. If you drink too strong tea, it is easy to cause caffeine to be absorbed into the blood, leading to dizziness, headache, allergies, nervous excitement, and even muscle tremor, arrhythmia, convulsions and other phenomena.
Matters needing attention in drinking tea
Drinking tea should not be eaten on an empty stomach. Tea can stimulate the gastrointestinal tract. Drinking tea on an empty stomach will stimulate the gastrointestinal tract, which will easily lead to excessive gastric acid secretion and seriously damage the gastrointestinal tract.
Drinking tea after drunkenness is easy to increase the burden on the heart, especially those who like to drink and eat barbecue in summer. It is not advisable to drink tea after drinking. You can eat fruit and sip vinegar to relieve alcohol.
The best time for tea.
morning tea
The first cup is morning tea, which is suitable for 9:00- 10 after breakfast. It can refresh, detoxify and resist fatigue, which is the most important of the three cups of tea.
The best choice for morning tea is scented tea. After secondary processing, scented tea mixes the richness of flowers with the fragrance of new tea, which can refresh the mind and enhance the spirit of the day.
afternoon tea
The second cup is afternoon tea, preferably after lunch or nap 1 until 3 o'clock. Afternoon tea can be moderately dark, which can reduce blood fat and protect blood vessels.
Green tea is generally chosen for afternoon tea. Green tea contains polyphenols, which has the health functions of antioxidation, scavenging free radicals and antivirus, and is suitable for instant drinking.
Evening refreshment
The third cup is evening tea, which is suitable for drinking from 6: 00 to 7: 00 after meals. It has the effects of reducing blood fat and helping digestion.
Black tea is most suitable for drinking at night, because fermented tea has low caffeine content and has little effect on sleep. People with cold constitution can drink more black tea, which warms the middle and dispels the cold, and is more useful for people with cold stomach, cold hands and feet, physical weakness and diarrhea.
In addition, try not to drink tea after 8 pm.