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. 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.
Function of black tea: Black tea can help digestion of stomach, stimulate appetite, induce diuresis, eliminate edema and enhance heart function.
Disease prevention: black tea has strong antibacterial ability. Gargling with black tea can prevent colds caused by viral diseases, prevent tooth decay and food poisoning, and reduce blood sugar and hypertension.
The American Heart Association once concluded that black tea is "one of the drinks rich in flavonoids which can eliminate free radicals and have anti-acidification effect, and can reduce the incidence of myocardial infarction".
The American Heart Association once concluded that black tea is "one of the drinks rich in flavonoids, which can eliminate free radicals, have anti-acidification effect and reduce the incidence of myocardial infarction". The results show that a cup of black tea can even play a stronger anti-acidification role than garlic, broccoli, carrots and Chinese cabbage for specific free radicals.
The drinking method of acid-resistant black tea is to drink 2~3 cups of black tea every day. Selenium, vitamins c, e, a, etc. They are all anti-acidification substances, and black tea will be more effective if eaten with foods rich in these substances. 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. Flavonoids in black tea have antibacterial effects such as killing poisonous bacteria in food and making influenza virus infectious. In addition to preventing colds, some people gargle with black tea when a cold causes a sore throat.
What are the functions of black tea and green tea?
There are functional components in black tea extract that can neutralize botulinum neurotoxin and Clostridium neurotoxin.
Experiments show that adding black tea extract to raw ham extract can neutralize botulinum neurotoxin. The study also showed that black tea extract could prevent botulinum neurotoxin from binding to the surface of animal nerve endings.
The blocking effect is directly related to the extraction concentration, and the higher the concentration, the greater the effect. In order to further study the antitoxin ability of black tea extract, B toxin with motor paralysis effect on zokor was mixed with the supernatant of black tea extract and ham extract to form a mixed sample, which was given to zokor orally.
The experimental results show that black tea extract can prevent zokor from paralysis, and the degree of prevention depends on the concentration of black tea extract. The application of black tea extract in food can not only improve toxicity, but also prevent the deterioration of food flavor.
Black tea is suitable for people: women (especially postpartum), cold patients, low blood pressure and the elderly. The effect of trace elements in green tea on human zinc can enhance human immunity, improve human anti-infection and disease resistance, improve the efficacy of insulin and eliminate white spots on nails.
Helps to treat mental disorders and reduce cholesterol accumulation. Zinc deficiency leads to growth retardation, immature sexual organs in adolescence, abnormal taste and slow wound healing. Zinc can enhance resistance, prevent colds and improve vision, which is beneficial to patients with prostate diseases.
Selenium-anticancer, maintaining cardiovascular health, diminishing inflammation and improving male sexual ability. Selenium deficiency may lead to stroke, which is one of the causes of premature aging. Cancer and heart disease may be related to selenium deficiency. Manganese-it participates in and catalyzes many enzymes, and also participates in the synthesis of many enzymes. Manganese is also related to bone metabolism, reproductive function and cardiovascular function. It is an essential mineral for iron deficiency anemia and helps to make breast milk.
Iron is necessary for exchanging and transporting oxygen in the blood and for many redox systems in the body. It can improve children's mental state, make them concentrate, promote their development and enhance their disease resistance, but iron can cause anemia. Copper can catalyze the synthesis of hemoglobin, which is beneficial to human hematopoiesis, help iron absorption and improve human vitality. Magnesium-helps the formation of bones, the manufacture of protein, the release of energy in muscles and the regulation of body temperature.
Amino acids-dilate blood vessels, relax bronchi, and have cardiotonic and diuretic effects. Tea polyphenols (tea tannin, tea tannin) are important substances with biological activity, which can treat burns, prevent inflammation and diarrhea, relieve gastrointestinal tension, and treat hypertension and diabetes.
Catechin-has the effects of anti-radiation injury and migraine. Theophylline-stimulates the function of higher nerve center, strengthens the heart, dilates blood vessels, relaxes smooth muscle and promotes diuresis.
Theobromine-stimulates the central nervous system. Relaxation of blood vessels, relaxation of smooth muscle, diuresis.
Caffeine can excite the central nervous system, induce diuresis, relax smooth muscle, lower cholesterol and prevent atherosclerosis. As we all know, drinking green tea has a good health care effect on human health. It helps to prevent the recurrence of heart disease, reduce the infectivity of viruses and bacteria, and plays an important role in preventing prostate cancer, breast cancer, gastric cancer and colon cancer. With the appearance of canned China tea, more and more young people like to drink China tea.
They think that China tea is a health care and beauty drink. In fact, the efficacy of black tea is not worse than that of green tea, and black tea is more conducive to heart health.
In the past five years, the United States has funded more than 150 studies on green tea and black tea and their chemical compositions. The results show that antioxidants in green tea and black tea can completely destroy the transmission path of chemicals in cancer cells. Dr Murray Mitelman, director of vascular epidemiology at Beth Israel Deaconess Medical Center in Boston, said, "Black tea has roughly the same efficacy as green tea, but the antioxidants in black tea are much more complicated than green tea, especially beneficial to the heart." .
On May 3, 2002, the American Medical Association published a survey report, and 497 men and 540 women were followed up for more than 10 years. The report pointed out that people who drink black tea have strong bones, and polyphenols in black tea (also found in green tea) have the activity of inhibiting bone cell destruction substances. If lemon is added to black tea, the bone strengthening effect will be stronger. In addition, the original anti-wrinkle materials of black tea: black tea, brown sugar and flour. Method: Boil the same amount of black tea and brown sugar with water until warm, then add flour and stir into paste. Usage: Apply it to face for about 65,438+05 minutes, and then wash it with warm water. Can be effective: China people have always believed in the efficacy of tea, and black tea contains anti-aging ingredients. If you insist on using it, it will help to reduce facial fine lines and make the skin smooth.
The efficacy of black tea and green tea
The difference between black tea and green tea lies in the different processing methods.
When black tea is processed, it is withered to make fresh leaves lose some water, then kneaded (kneaded into strips or cut into granules), and then fermented to oxidize the tea polyphenols contained in it and turn them into red compounds. This compound is soluble in water and insoluble in water, but it accumulates in leaves, thus forming red soup and red leaves.
There are three main kinds of black tea: competition black tea, kung fu black tea and red broken tea. The difference between black tea and green tea Green tea-unfermented tea has been widely loved by people in China, Japan and North Africa for its unique refreshing aroma and health care function since ancient times.
The production method of green tea is to put the tea leaves into a large iron plate for drying and dehydration immediately after picking, so as to keep the dark olive green color and avoid further fermentation and deepen into brown. Oolong tea-semi-fermented tea According to Lu Yu's Tea Classic, oolong tea must be "wrinkled like Tatar's riding boots, rolled like the drooping skin of a steer, and scattered like the morning mist rising in the valley.
Oolong tea is characterized by large leaves, all of which are rolled. Oolong tea only needs a short fermentation process, and its flavor has both the fragrance of green tea and the smoothness of black tea.
Black tea-fully fermented tea The biggest difference between black tea and green tea is not the type of tea used, but whether the tea has been fermented. Why do you want to ferment tea? Legends abound.
It is said that in the17th century, when a ship belonging to the British East India Company transported green tea from China (Wuyi) to Britain, the tea was accidentally oxidized and fermented due to its long voyage. However, western businessmen are deeply attracted by this kind of "black tea" with heavy ups and downs, deep color and fragrant smell! From then on, China began to produce this "new" tea in large quantities. Nowadays, fermented black tea accounts for about 90% of the world's tea production (note: China's fermented black tea appeared as early as10 ~13rd century in the Song Dynasty).
Relationship between tea and caffeine: The longer the tea is fermented, the more caffeine it contains. The caffeine content of unfermented green tea is only one third of that of fully fermented black tea.
The caffeine content of semi-fermented oolong tea is only about half that of black tea. Of course, the brewing time will also affect the caffeine content of tea soup. The longer the brewing time, the more caffeine is extracted, and vice versa.
Generally speaking, when black tea is brewed for four minutes, it will release 40 mg to 100 mg of caffeine; If the extraction lasts only three minutes, only 20 mg to 40 mg of caffeine will dissolve in the tea soup. Which patients should not drink tea-people with constipation should not drink tea.
Because polyphenols in tea have a certain astringent effect on gastrointestinal mucosa, constipation patients will aggravate constipation if they drink tea. -People with neurasthenia or insomnia should not drink tea.
Because caffeine in tea has obvious exciting effect on cerebral cortex, drinking tea will make the brain extremely excited and unable to rest. -People with iron deficiency anemia should not drink tea.
Because tannic acid in tea leaves will make iron in food form a precipitate that is not absorbed by the human body, which will aggravate anemia. -People with calcium deficiency or fracture should not drink tea.
Because the alkaloids in tea will inhibit the absorption of calcium in duodenum, it will also lead to calcium deficiency and osteoporosis, making it difficult to recover the fracture. -People with ulcers should not drink tea.
Because theophylline in tea will reduce the activity of phosphodiesterase and make gastric parietal cells secrete a lot of gastric acid. Hyperacidity will inevitably affect the healing of ulcer surface and offset the efficacy of some antacids.
-People with urinary calculi should not drink tea. Because tea contains more oxalic acid, drinking tea will aggravate the development of stones.
-Don't drink tea when you have a fever. Because theophylline contained in tea can raise human body temperature, the cooling effect of drugs is greatly reduced or even disappeared.
Therefore, patients with fever should not drink tea. Tea spa is unique. Tea is an ordinary daily drink. If skillfully used, it can alleviate or prevent many common diseases.
—— Prevention and treatment of dental caries in children: Fluorine in tea can prevent teeth from dephosphorization and decalcification in acidic oral environment, so gargling with tea can prevent dental caries. -Palpitation and nausea caused by bad breath or excessive smoking can be relieved by gargling with tea and drinking proper amount of strong tea.
—— People who are prone to bleeding when brushing their teeth: You can drink tea often, because tea is rich in vitamin C, iron and hemostatic ingredients, which can make the gums tough, increase the elasticity of capillaries and prevent bleeding. -Motion sickness and seasickness: drink a small cup of warm tea in advance with 2-3 ml of soy sauce.
-Diarrhea: Tannic acid in tea has astringent and antidiarrheal effects. Drinking strong tea can stop diarrhea. -When the baby's skin is wrinkled and swollen: you can boil water with tea and rinse it for the baby at a suitable temperature.
—— Overwork: A cup of fresh tea can quickly eliminate fatigue and restore energy. -People who suffer from overeating and greasy: You can drink strong tea, such as brick tea or Tuocha, and the greasy effect is better.
-Patients with high cholesterol and cardiovascular diseases: Drinking a cup of tea and water every day can lower cholesterol and protect the cardiovascular system. -loss of appetite and yellow urine: drink more light tea.
Tea that is too fresh is not suitable for drinking. Many people think that the fresher the tea, the better. The tea just picked from the tea tree is the best. In fact, this understanding is incorrect.
From the point of view of nutrition, the freshest nutrients are not necessarily the best, because the so-called new tea refers to the tea that has been picked for less than a month. Because these tea leaves have not been placed for a period of time, some substances that have adverse effects on the body, such as polyphenols, alcohols, aldehydes, etc., have not been completely oxidized. If you drink new tea for a long time, you may have discomfort such as diarrhea and bloating. Too fresh tea is even worse for patients, such as some people with gastric acid deficiency or elderly patients with chronic gastric ulcer, which is even more unsuitable for drinking new tea.
The new tea party will * * * their gastric mucosa, which will cause gastrointestinal discomfort and even aggravate the condition. Drink tea in moderation and don't be greedy.
Normal people, especially middle-aged and elderly people, should drink 4-5 cups a day. Tea should be light.
People who like to drink strong tea should drink 1-2 cups of strong tea every day. If you drink too much tea, there will be more water in your body, which will increase the burden on your heart and kidneys.
Strong tea will make the brain too excited, the heart beat faster, frequent urination, insomnia and so on. It is advisable to make tea with boiling water.
Oolong tea is brewed for about two minutes, and then poured into the teacup from the teapot for drinking. Beneficial effects of warm water tea.
Advantages and disadvantages of drinking black tea and green tea
Black tea is made by fermentation and baking. During the fermentation process, tea leaves turn into red oxides and become black tea under the action of oxidase. Black tea is mild in nature and mellow in taste. Besides containing a variety of water-soluble vitamins, it is also rich in trace element potassium. When brewing, 70% potassium can be dissolved in tea. Potassium can enhance blood circulation in the heart and reduce calcium consumption in the body. Because manganese contained in black tea is one of the indispensable elements of bone structure, drinking black tea often is also beneficial to bone strength. According to foreign reports, drinking black tea often has the effect of preventing and treating influenza, stroke and skin cancer. The benefits of green tea
1. Reduce fat and lose weight to prevent cardiovascular and cerebrovascular diseases.
2. Prevent cancer. Green tea contains tea polyphenols and caffeine, which have comprehensive effects, not only refreshing, but also improving human immunity and anti-cancer.
3. Antivirus and sterilization.
4. Long life.
shortcomings
1. Children should not drink too much, which will lead to calcium loss.
2. Not drinking strong tea on an empty stomach will lead to tea drunkenness.
Terrible trouble. Black tea needs very high water temperature (100 degree boiling water), which you may not be able to reach at school.
It is best not to add anything to tea, which will destroy the texture and taste of tea ~ ~ ~
Especially with sugar, the taste of tea is bitter and cold. The purpose of drinking tea is to promote the secretion of digestive juice with the help of bitter digestive glands of tea, thus enhancing digestive function. Then use the coolness of tea to achieve the effect of clearing heat and detoxifying.
If sugar is added to tea, this function will be inhibited. However, in ancient books, there are also remedies to treat diseases with tea instead of sugar, which can be used as diet therapy. If you drink tea at ordinary times, it is not appropriate to mix sugar.
Tea includes green tea, black tea and so on. From the health care effect, green tea is the best. 1. Green tea contains the most abundant nutrients needed by human body, such as protein, vitamins and trace elements. Although determined, the iron content per 100g green tea is 40mg, which is 8 times higher than that of hawthorn/kloc-0 and 29 times higher than that of grape. Drinking 10g green tea every day can get 30% iron needed by physiology. It also contains a lot of zinc. People who drink green tea regularly can get 30 mg of zinc every day, which is more than those who don't drink 16 mg. As for manganese, which has unique advantages in preventing diseases such as osteoporosis and skin itching, green tea is also the most abundant. Second, green tea contains some special disease-resistant ingredients, such as antidiabetic substances, which can lower blood sugar, promote insulin secretion and help diabetic patients recover, while black tea contains very little. Third, there are the least harmful elements. Take aluminum for example. According to the test, tea is an aluminum-loving plant, which can absorb a lot of aluminum in the soil, especially black tea, with the highest aluminum content, which can reach 7.2-7.5 mg per ml of soaking solution, while green tea is much less. Therefore, whether men, women and children drink tea, green tea should be the first choice. Hope to adopt!
What are the different effects of green tea and black tea?
Characteristics and efficacy of black tea
The dry brown color of black tea and the brewed tea soup are mainly red, so it is called black tea. It is made of tea suitable for making this product, and refined through typical technological processes such as withering, rolling, fermentation and drying.
When black tea was first produced, it was called "black tea". During the processing of black tea, chemical reactions occurred, and the chemical components in fresh leaves changed greatly, and tea polyphenols decreased by more than 90%, resulting in new theaflavins and theaflavins. Aroma substances increased from more than 50 kinds in fresh leaves to more than 300 kinds, and some caffeine, catechin and theaflavin complexed to form delicious complexes, forming the quality characteristics of black tea, red soup, red leaves and sweet alcohol.
Black tea can be divided into ethnic black tea, kung fu black tea and black broken tea according to different production methods.
The efficacy of black tea
On May 3, 2002, the American Medical Association published a survey of 497 men and 540 women who had been 10 years. It has been pointed out that people who drink black tea have strong bones, and polyphenols in black tea (also found in green tea) have the activity of inhibiting substances that destroy bone cells. The contents of polyphenols in various foods are as follows: black tea-17.4, green tea -6544.
In order to prevent and treat female osteoporosis, it is suggested to drink a small cup of black tea every day for several years, and the effect is obvious. If lemon is added to black tea, the bones will be strengthened and the effect will be stronger. Various fruits can also be added to black tea, which can play a synergistic role.
The osaka city university experiment in Japan pointed out that after drinking black tea 1 hour, the blood flow velocity of the heart increased, which confirmed that black tea had a strong role in preventing and treating myocardial infarction.
American magazines report that black tea has stronger anti-aging effect than garlic, broccoli and carrots.
There are several interesting sayings about black tea for your reference:
Health care: Black tea can help digestion, stimulate appetite, induce diuresis, eliminate edema and enhance myocardial function.
Disease prevention: black tea has strong antibacterial ability. Gargling with black tea can prevent colds caused by viral diseases, prevent tooth decay and food poisoning, and reduce blood sugar and hypertension.
Studies have shown that black tea is as effective as green tea and is more beneficial to the heart.
According to the International Herald Tribune reported on July 28th, as we all know, drinking green tea has a good health care effect on human health. Helps to prevent the recurrence of heart disease, reduces the infectivity of viruses and bacteria, and plays an important role in preventing prostate cancer, breast cancer, gastric cancer and colon cancer. In fact, the efficacy of black tea is not worse than that of green tea, and black tea is more conducive to heart health.
In the past five years, the United States has funded more than 150 studies on green tea and black tea and their chemical compositions. The results show that antioxidants in green tea and black tea can completely destroy the transmission path of chemicals in cancer cells. Dr Murray Mitelman, director of vascular epidemiology at Beth Israel Deaconess Medical Center in Boston, said, "Black tea has roughly the same efficacy as green tea, but the antioxidants in black tea are much more complicated than green tea, especially beneficial to the heart." .
On May 3, 2002, the American Medical Association published a survey report, and 497 men and 540 women were followed up for more than 10 years. The report pointed out that people who drink black tea have strong bones, and polyphenols in black tea (also found in green tea) have the activity of inhibiting bone cell destruction substances. If lemon is added to black tea, the bone strengthening effect will be stronger. Besides,
What are the effects of black tea and green tea?
Different teas have different "personalities": black tea is warm and can nourish human yang, green tea is cold and can clear away heat, oolong tea moistens the throat and produces fluid, and scented tea nourishes the liver and gallbladder. Theoretically speaking, drinking tea can also cure diseases and prevent diseases, but different teas have different "indications", so everyone should choose the variety that suits them. Drink black tea to prevent influenza. Drinking tea in winter is the top grade. Black tea is sweet and warm, which can nourish human yang; Black tea is rich in protein and sugar, which generates heat and warms the abdomen, enhances the cold resistance of human body, and helps digestion and greasy. In some parts of China, there is also the habit of drinking black tea with sugar, milk and sesame seeds, which can not only warm the abdomen, but also increase nutrition and keep fit. Studies have found that black tea can reduce the incidence of stroke and heart disease. Stroke and heart disease are high-risk diseases in winter, so elderly people with cardiovascular and cerebrovascular diseases often make a cup of warm black tea in winter, which can not only warm their bodies, but also play a role in preventing diseases. In addition, gargling with black tea or drinking it directly can also prevent influenza, which is also necessary in winter. Drinking black tea also plays a unique role in preventing osteoporosis and reducing the incidence of skin cancer, making the audience of black tea wider. Because black tea is a kind of fermented tea, it is weak, especially suitable for people with weak stomach and body. Dr. Liu Yang, from the Sub-health Department of Oriental Hospital affiliated to Beijing University of Chinese Medicine, reminded that it is best to control the amount of tea to 3 to 5 grams when drinking black tea. Pay attention to hot drinks, and it is best to drink them now. If it is left for a long time, the nutrition and taste will be discounted. Green tea is dry in winter, and people like to eat greasy and spicy food. The fire of green tea has become a health problem that puzzles many people, and brings constipation, dry mouth and even aphtha. You can turn to green tea at this time. Green tea is unfermented tea, which is cold and can clear away heat. Therefore, it can remove fire, promote fluid production to quench thirst, promote digestion and eliminate phlegm, accelerate the healing of mild gastric ulcer, reduce blood lipid and prevent arteriosclerosis. Therefore, people who are easy to get angry, people who usually like smoking and drinking, and obese people (usually with real heat constitution) are more suitable for drinking green tea; People with stomach deficiency and fear of cold should not drink green tea. Oolong oolong tea is a semi-fermented tea, which is between green tea and black tea. Its color is blue and brown, so it is named "green tea". In taste, oolong tea not only has the fragrance and natural floral fragrance of green tea, but also has the mellow fragrance of black tea. Not cold or hot, mild. Therefore, it has the functions of moistening skin, moistening throat, promoting fluid production and eliminating accumulated heat in the body, and can make the body adapt to the changes of natural environment. In winter, the indoor air is mostly dry, and people are prone to dry mouth and chapped lips. At this time, soaking in a cup of oolong tea can alleviate the distress of dryness. In addition, oolong tea has a good decomposition effect on protein and fat, which can prevent the accumulation of liver fat. For people who are afraid of sticking to fat in winter, green tea also has a certain weight loss effect. Patients with depression may wish to taste scented tea, including jasmine tea, magnolia tea, osmanthus tea and rose tea. It is made of green tea and different fragrant flowers. Generally speaking, scented tea can nourish liver and gallbladder, strengthen limbs and dredge meridians. Take jasmine tea as an example, it can clear away heat and relieve summer heat, strengthen the spleen and soothe the nerves, and has a good effect on treating dysentery and preventing stomachache. Honeysuckle Chaze can clear away heat and toxic materials, refresh and quench thirst, and has an ideal curative effect on sore throat, and also has a good effect on preventing influenza. Therefore, winter should be properly chosen, especially for women who are prone to depression and irritability before and after menopause and during menstruation. It is advisable to drink scented tea to eliminate depression.
What is the difference between the efficacy and function of black tea and green tea?
2. 1 green tea green tea is made from fresh leaves picked at high temperature, killing various oxidases, keeping the tea green, and then rolling and drying. Clear soup and green leaves are the same characteristics of green tea quality.
Theoretically speaking, green tea belongs to cold nature and is not suitable for people with cold stomach. Because there is no fermentation, and it has been treated with enzyme deactivation, the tea polyphenols in it are very preserved and the vitamins are well preserved.
Because of this, it has the best anti-oxidation and anti-aging functions. 2.2 Black Tea Black tea is made by selecting fresh leaves suitable for making black tea, withering, rolling, fermenting and drying.
The chemical composition of fresh leaves changed greatly, and tea polyphenols decreased by more than 90%, resulting in new components such as theaflavins and thearubigins. Aroma substances increased from more than 50 kinds in fresh leaves to more than 300 kinds, and some caffeine, catechin and theaflavin complexed to form delicious complexes, forming the quality characteristics of black tea, red soup, red leaves and sweet alcohol.
Because many polyphenols are fermented and transformed, it has little effect on human stomach. Theoretically speaking, Chinese medicine belongs to mild nature and is more suitable for people with cold stomach.
And because it's less sexual, it's better for the heart. A large amount of theaflavins formed by it is a powerful lipid-lowering substance, which can prevent the formation of lipid deposition in blood vessels, thus preventing coronary heart disease or stroke, so black tea is better than green tea in preventing cardiovascular accidents.
Aromatic components are more abundant, and there are more kinds of components beneficial to human body. In more than 50 studies on green tea and black tea and their chemical components sponsored by the United States, the results show that antioxidants in green tea and black tea can completely destroy the transmission path of chemicals in cancer cells.
Dr Murray Mitelman, director of vascular epidemiology at Beth Israel Deaconess Medical Center in Boston, said, "Black tea has roughly the same efficacy as green tea, but the antioxidants in black tea are much more complicated than green tea, especially beneficial to the heart." . This is the information I found when I was studying tea science! .
Which effect is better than black tea?
Which is better for health, green tea or black tea? The general answer is: both kinds of tea are beneficial to human body, but in different ways.
Because green tea is baked in quick fire, it basically maintains the original three functional nutrients of tea, namely tea polyphenols, theanine and tea polysaccharides. As we all know, tea polyphenols is an excellent natural antioxidant, which can eliminate the damage of "free radicals" (one of the harmful substances produced in the process of human metabolism) to human tissues and organs.
Theanine is a natural "sedative".
Once fermented, tea becomes "black tea". Its chemical composition is very different from that of green tea. According to the reports of tea researchers at home and abroad, the main substance "tea polyphenols" in green tea will be transformed into "theaflavins" after high temperature fermentation. "Theflavins" is a powerful lipid-lowering substance, which can prevent the formation of lipid deposits in blood vessels, thus preventing coronary heart disease or stroke, so drinking black tea often is good for preventing cardiovascular accidents.
From the pharmacological point of view, green tea has more health care functions. According to western researchers, green tea has at least 10 pharmacological effects: antibacterial, antiviral, anti-dental caries, eliminating halitosis, lowering blood fat, lowering blood pressure, resisting cancer, resisting radiation, lowering blood sugar and preventing diabetes.
In a word, green tea is better than black tea in disease prevention.