Introduce the functions of one or two kinds of tea.
Black tea: Green tea becomes "black tea" after fermentation. Its dry tea color and brewed tea soup are mainly red, so it is called black tea. Black tea can be divided into ethnic black tea, kung fu black tea and black broken tea according to different production methods. The chemical composition of black tea is quite 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.
Green tea: The color of dry tea itself and the brewed tea soup are normal green, and they are baked quickly, so the original three functional nutrients of tea, namely tea polyphenols, theanine and tea polysaccharides, are basically maintained. 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.
Second, the comparison of concerns.
1, brewing method
Green tea brewing method:
Brew with water at 80℃~85℃ and drink now. Green tea belongs to non-fermented tea, and the more common ones are West Lake Longjing and Biluochun. This kind of tea is tender and not suitable for brewing with boiling water. The suitable temperature is 80℃~85℃, the ratio of tea to water is 1:50, and the brewing time is 2~3 minutes, so it is best to drink it now. If the brewing temperature is too high or the time is too long, the tea polyphenols will be destroyed, the tea soup will not only turn yellow, but also the aromatic substances in it will be lost by volatilization. It is best to brew green tea in a porcelain cup. When brewing, first soak the tea leaves with 1/4 water, wait for 20 seconds or half a minute before drinking with water, and generally do not cover the tea leaves when soaking green tea, otherwise the tea soup will turn yellow.
Black tea brewing method:
Burn the cup with hot water first, and then brew it with boiling water. Black tea is fully fermented tea, and the common ones are high-grade Kung Fu red stripe tea and red broken tea. Different from green tea, soaking in high water temperature can promote the dissolution of beneficial components. Therefore, it is best to brew black tea with freshly boiled water, the water consumption is equivalent to that of green tea, and the brewing time is 3-5 minutes. High-grade Kung Fu black tea can be brewed 3-4 times, and red crushed Chaze can be brewed 65,438+0-2 times. It is best to brew black tea in a glass, so that you can enjoy the rolling and stretching of tea leaves in water. The specific method can be investment method. First, pour110 hot water into the cup, then pour 3-5g tea leaves, and then pour water along the glass wall for brewing. Cover with black tea to make it more fragrant. ?
?
2. Function and efficacy.
The reason why I think black tea is superior to green tea is not only my personal preference for black tea, but also partly because the efficacy of black tea is of high quality, which has been proved by many experiments. Although green tea also has some effects, I still want to highlight the effects of black tea.
Reduce osteoporosis
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. Morimi Tellman, 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 antioxidant of black tea is much more complicated than green tea, especially beneficial to the heart." American magazines report that black tea has stronger anti-aging effect than garlic, broccoli and carrots.
Smooth blood flow
There is also a study in the American medical community related to black tea. It was found that the vasodilation function of patients with heart disease could be improved from 6% to 10% by drinking 4 cups of black tea every day. After stimulation, the diastolic degree of normal people will increase by 13%. A variety of nutrients, such as a variety of water-soluble vitamins, rich trace elements of potassium and manganese, but also contains a flavonoid. After brewing black tea, 70% potassium can be dissolved in tea, and potassium can enhance the blood circulation of the heart.
burst with vitality
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, thus accelerating the excretion of lactic acid (a substance that makes muscles feel tired) and other old and waste substances in the body, achieving the effect of eliminating fatigue and achieving the effect of being energetic.
3. Applicable people
Black tea: Because there is one more fermentation process than green tea, black tea is milder. For people with bad stomach, drinking black tea is much better than green tea. Besides nourishing and protecting the stomach, black tea has the functions of relaxing blood vessels, promoting blood circulation, reducing osteoporosis, replenishing energy, resisting oxidation, delaying aging, promoting fluid production and stopping diarrhea, resisting bacteria, enhancing immunity, treating ulcers, moistening lung and reducing swelling, and can also prevent and assist in the treatment of some cardiovascular diseases. However, patients with insomnia, cardiac and renal insufficiency and tumors should avoid eating black tea. In addition, because black tea contains tannic acid, it will inhibit the absorption of iron in food and is not suitable for anemia patients.
Green tea: It has obvious inhibitory and killing effects on pathogenic bacteria and viruses, and is suitable for people with atherosclerosis. It can also block the synthesis of various carcinogens such as ammonium nitrite in the body. It is more suitable for drinking in summer, can relieve summer heat and lose weight, and is very suitable for girls who love beauty. People who are prone to get angry at ordinary times, people who like smoking and drinking, and obese people (usually with excess heat constitution) are all suitable for drinking green tea, but it has a disadvantage that it is not suitable for people who often have gastrointestinal discomfort.
Third, summary.
Both black tea and green tea are very good, but I personally prefer black tea, so I think black tea is better. I recommend drinking black tea for health. However, if you really want to insist on drinking more, you'd better make a drinking choice by comparing it with the people. At the same time, I hope this article is useful to you. I hope it can be adopted. Thank you.