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. Green tea is antibacterial
Studies have shown that catechins in green tea can inhibit some bacteria that cause human diseases without harming the proliferation 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. Green tea lowers blood fat
Animal experiments made by scientists show that catechins in tea can reduce total cholesterol, free cholesterol, low-density lipoprotein cholesterol and triglycerides 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 multiple 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 cariogenic 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 can prevent cancer
Green tea can inhibit 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. Whitening and UV protection of green tea
Experts found in animal experiments that catechins in green tea can resist skin cancer caused by UV-B.
8. Green tea can improve indigestion.
Recent research reports show that green tea can help improve indigestion, such as acute diarrhea caused by bacteria, and drinking a little green tea can alleviate the condition.
Matters needing attention in green tea health care
Green tea skin care products have good efficacy and limited validity.
Although the effect of green tea skin care products is good, there are still some considerations in choosing such products. In green tea, tea polyphenols are one of the main substances that play a role in skin care and beauty. This substance has antioxidant effect, and it can replenish water and tighten skin when used in combination with vitamins B and E. However, it should be noted that tea polyphenols, as the general name of phenolic substances or their derivatives, are easy to volatilize in the air and lose their antioxidant effect. Therefore, this kind of skin care products, especially facial masks, had better be the new tea products of that year.
Drink green tea to lose weight and prevent diseases, but drink it carefully during menstruation.
Green tea contains a certain amount of caffeine. When it coexists with tea polyphenols, it can prevent the function of caffeine in the stomach, avoid stimulating the secretion of gastric acid, and make the disadvantages of caffeine not play in the body, but promote the functions of the central nervous system, heart and liver. Moreover, the aromatic compounds in green tea can also dissolve fat and prevent fat from accumulating in the body. Caffeine can also promote the secretion of gastric juice, help digestion and fat elimination. However, it is best for women not to drink more alcohol during menstruation. Studies have shown that in addition to the normal iron loss of human body, women will also lose 18 ~ 2 1 mg of iron during each menstrual period. Drink more green tea during menstruation, and more tannic acid in green tea will combine with iron molecules in food to form a large number of sediments, which will hinder the absorption of iron molecules by intestinal mucosa. Moreover, the stronger the green tea, the greater the obstacle to the absorption of iron.
The concept of "drinking green tea is good for health" is not only a familiar common sense, but also a general trend in domestic society. Because tea itself has antibacterial and antioxidant effects, it has its unique effect on preventing cancer. According to the research report, residents living in tea-producing areas are less likely to die of cancer because they often drink tea.
Usually, the tea we refer to is mainly green tea. Green tea is rich in catechins, tannins and vitamin C, which can improve the health of the body and has many beneficial effects. In particular, catechins with a little astringency have strong antioxidant and cancer prevention functions.
Green tea and oolong tea are produced by the same kind of tea tree. The biggest difference is whether it has been fermented or not. Because the catechins in tea will combine with each other with the increase of fermentation temperature, the color of tea will become darker, but the astringency of tea will also decrease. The component formed by catechin combination is the polyphenol of oolong tea. Antioxidant polyphenols and catechins can affect the activation of various enzymes in our body. About half of catechins in tea will be converted into polyphenols in oolong tea. Therefore, under the dual effects of catechins and oolong tea polyphenols, oolong tea shows various functions that green tea does not have.
The magical effect of oolong tea
Dental tartar will be produced in tissues to prevent tooth decay.
Drinking a cup of tea after a meal can not only promote fluid production and relieve cough, but also refresh your breath. Oolong tea also has the function of preventing tooth decay. The cause of tooth decay is that bacteria invade the tooth tissue and produce enzymes in the tissue, which leads to tooth decay. This enzyme reacts with sugar contained in food to produce substances that corrode teeth. This substance and bacteria that can decay teeth adhere to the teeth to form tartar, and after accumulation, tooth decay will occur.
Polyphenols contained in oolong tea can inhibit the production of tartar enzymes, so drinking a cup of oolong tea after meals can prevent the occurrence of tartar and tooth decay. Scientists have proved through long-term experiments that letting white rats eat feed containing polyphenols will reduce the probability of tooth decay. If you don't have time to brush your teeth after meals, drinking a cup of oolong tea to prevent tooth decay is also a good choice.
Eliminate reactive oxygen species harmful to beauty and health
Reactive oxygen species are substances produced in the body due to ultraviolet rays, smoking, food additives, stress and other factors. It turns body fat into peroxide fat, which leads to lifestyle diseases and hinders health. At the same time, reactive oxygen species can also cause skin aging, wrinkles and a series of problems that hinder beauty.
There is an enzyme SOD in human body, which can successfully decompose reactive oxygen species. This enzyme is indispensable for maintaining health and beauty beauty. Polyphenols in oolong tea have the same function as SOD, which can promote SOD to eliminate active oxygen.
We all know that the growth of skin needs vitamin C. If active oxygen is produced, vitamin C will be consumed. The antioxidant effect of oolong tea polyphenols can eliminate active oxygen, and then inhibit the consumption of vitamin C, so it can keep the skin delicate and fair. In addition, oolong tea itself contains vitamin C, which can kill two birds with one stone for whitening skin. Vitamin C will be excreted with urine in about 2-3 hours. Therefore, drinking oolong tea at any time can whiten the skin and ensure the supplement of vitamin C.
Drinking 1 l oolong tea every day can improve skin allergies.
A survey shows that allergic dermatitis is very common in patients with skin diseases, but the cause of this dermatitis is still unclear. But oolong tea can inhibit the development of the disease. By making experiments on skin inflammation symptoms of mice, it is proved that oolong tea has inhibitory effect on dermatitis of mice.
A foreign expert once found that 12 1 adult allergic dermatitis patients, treated with existing steroids and antiallergic drugs, still could not improve their condition. Later, after drinking 400ml concentrated oolong tea every day, one month later, 78 of them (64%) had obvious improvement in symptoms.
Drinking oolong tea can really slim down.
We often hear that drinking oolong tea can "dissolve fat". Especially after eating too much greasy food, drinking oolong tea can decompose oil, so is this statement correct? The unconsumed energy in human fat cells is stored as neutral fat so as to be used as energy in exercise. At this time, neutral fat is decomposed into necessary energy for use under the action of enzymes such as protein-like lipase. Drinking oolong tea can improve the function of protein-like lipase That is to say, oolong tea itself can't dissolve fat, but it can improve the enzymes that decompose fat, so after drinking oolong tea, the amount of fat metabolism also increases relatively, thus playing a role in slimming.
Some experts have done experiments on 102 obese adults, drinking 600cc oolong tea twice a day, 300cc each time in the morning and afternoon, for 6 weeks. During this period, no other weight loss or food therapy was used. Results The weight loss was not obvious, but the waist circumference, abdominal subcutaneous fat, blood neutral fat and blood total cholesterol all showed a significant downward trend, which was related to polyphenols contained in oolong tea.
Anti-tumor and anti-aging effects
Oolong tea can promote blood lipid decomposition and reduce cholesterol content. A foreign 1994 experimental report on the efficacy of oolong tea pointed out that oolong tea has a quite good curative effect on patients with hyperlipidemia and hypertension. In particular, among the 68 hypertensive patients in Gao Xue who participated in the trial, 75% of them showed a downward trend in blood pressure after one-stage test.
In addition, oolong tea also has the functions of anti-tumor, improving the activation of lymphocytes and NK cells, enhancing immune function and preventing aging. Experts have found that oolong tea polyphenols can also absorb foreign bodies in the body and discharge them together.
For the amazing efficacy of oolong tea, experts point out that the amount of oolong tea that can produce efficacy every day is about 1 liter. If the amount can't reach 65,438+0 liters, it is necessary to brew strong tea to drink, so as to obtain enough polyphenols. In addition, it should be noted that it is unscientific to drink a lot of oolong tea once a day. The correct way is to drink oolong tea several times a day, so that the polyphenols in oolong tea can be fully absorbed by the human body. Also, you should get into the habit of drinking a cup of oolong tea after dinner.
Oolong tea is a major category of tea, named after Su Wulong, the founder of the Qing Dynasty. Because it is semi-fermented tea, the production process and quality are between black tea and green tea. The basic process includes six steps: drying in the sun, cooling, shaking, deactivating enzymes, rolling and drying. After stopping the fermentation process through a special process, the unique appearance of "green leaves and red edges" was formed. Because of its color, it is sometimes called green tea.
Oolong tea is famous at home and abroad and is known as the pearl of tea. After brewing, it has a fragrance similar to Meslan. Its taste is mellow and sweet, and it has a special "throat rhyme" feeling when drinking, that is, the tea soup slowly produces saliva after passing through the throat, but it has a aftertaste, like chewing something. The aroma is crisp, strong but not astringent, and the second and third bubbles are the best.
Oolong tea is mainly produced in Fujian, Guangdong and Taiwan Province provinces. The best are Wuyi Rock Tea in northern Fujian, Tieguanyin Tea in southern Fujian, Danzong Tea in Guangdong and Frozen Top Oolong Tea in Taiwan Province Province.