What are the seven recommendations for healthy tea
"The word" tea "is disassembled, and it can be changed […]
"The word" tea "is disassembled, and it can be changed into a few numbers. The initials of the grass are twenty, the middle is eight, the disjunction of the wood is eighty, the sum of the three is 108, and the person who lives to 108 is called tea life. "Academician Chen told reporters that the proportion of adults drinking tea in China is 45%. Some people like the taste, some people want to keep in good health, but there are several specific types of tea, and there are not many people who know the health benefits.
Academician Chen introduced that according to the different tea making techniques, tea can be divided into green tea, black tea, black tea, oolong tea, white tea and yellow tea. China's green tea consumption is the first, black tea is the second; but from a global perspective, black tea consumption is the highest. Specific to each region, the consumption of tea has its own characteristics. For example, Jiangsu and Zhejiang drink more green tea, and Yunnan, Inner Mongolia, and Xinjiang Uygur Autonomous Region drink more black tea. There are four aspects of tea efficacy currently determined. Different teas have different specific effects.
anti-oxidation. Studies have shown that green tea has many times more antioxidant activity than the other 21 fruits and vegetables participating in the experiment. Studies have also shown that the antioxidant activity of tea extracts is stronger than vitamin C and vitamin E. Therefore, drinking tea can prevent aging and cancer caused by oxidative damage.
Prevent cardiovascular disease. Black tea and oolong tea work best. Academician Chen introduced that in the study of the health effects of tea on the human body, the research on cardiovascular diseases is the most convincing. The results show that insisting on drinking tea not only helps lower blood pressure and fat, but also reduces the mortality of coronary heart disease.
Anti-cancer and anti-allergy. Among them, green tea has the best anti-cancer effect, which is related to the rich catechins. Japan ’s epidemiological study of more than 8,000 people for 10 years has proved that drinking 10 cups of green tea a day can delay the occurrence of cancer, with an average delay of 7.3 years for women and 3.2 years for men. Both Japan and the United States have used green tea for cancer prevention. The study also found that the catechins in the tea have anti-allergic effects. People who are allergic to seafood and pollen can drink more tea.
Prevent caries. This is because the tea polyphenolic compounds can kill the caries bacteria present in the tooth gap and make it difficult to attach to the tooth surface, thereby preventing caries, and the addition of tea polyphenols in toothpaste is also the reason. In addition, the fluorine in tea also has a strong tooth effect.
In addition, recent studies have pointed out that drinking tea often can reduce the risk of cognitive decline in the elderly, especially those who have a genetic risk of dementia.
Seven recommendations for healthy tea
Based on years of research and practice, Academician Chen gave 7 suggestions for drinking tea. Drink different teas for different constitutions. Green tea is cold, it is recommended to drink black tea for those who have a bad stomach, and to drink new green tea for a long time; people with obesity are advised to drink oolong tea and black tea.
Drink different teas in different seasons. It is recommended to drink green tea in spring and warm stomach black tea in winter. But mainly depends on personal preferences.
Make tea two or three times a day. Don't drink a pot of tea from morning to night. If the tea is weak, it should be poured and re-brewed. It is best to brew two or three times a day.
Don't drink too strong tea. It is not recommended to drink strong tea, especially before going to bed. Among them, polyphenolic compounds can affect mineral absorption, and also have great nerve stimulation. It is recommended to put 3 grams of tea in 150 ml of water.
Black tea and black tea are soaked in boiling water. Some people think that in order to avoid destroying tea polyphenols, the use of 80 ℃ water is actually not necessary. Academician Chen suggested that the tender one-bud and one-leaf tea can be brewed with low water temperature, while black tea and black tea can be completely boiled with water.
Do not drink overnight tea. No studies have shown that overnight tea is carcinogenic, but if the tea is left overnight, it is inevitable that there will be microbial contamination and hygiene is not guaranteed, so it is not recommended to drink overnight tea.
Seal and store tea at low temperature. Academician Chen will fill the jar with tea, cover it, seal it with a sealed bag, and put it in a small refrigerator that specializes in storing tea. Sealed and low temperature can prevent the oxidation of tea polyphenols and avoid cross-flavour. This will keep the tea flavor for half a year to a year.
Four key to picking tea
Academician Chen believes that when choosing a good tea that suits you, you should pay attention to the following points.
Choose tea according to personal preference. The tenderer the tea, the better, but the tenderer, the lighter the taste. Choose tea according to personal taste, like the refreshing optional Anji white tea; like the thick optional rubbing tip or peak. Academician Chen doesn't like tea that is too light. If you don't choose one bud and one leaf at the time of purchase, you usually choose one bud or two leaves tea.
Teabags are not necessarily of poor quality. It is easy to brew tea bags when you see them in the hotel. You do n’t have to worry about the tea leaves when you drink the tea. This tea is not necessarily of low quality. In foreign countries, tea bags are generally used for high-quality tea. This is only for convenience and cannot be used as an indicator to measure the quality of tea.
Don't be fooled by the gorgeous packaging. Some exquisitely packaged teas are expensive, but the quality is not necessarily good, so expensive is not a measure of tea quality. The packaging should be basically moisture-proof and moisture-proof.
Give priority to big brands. The quality of the tea of the big brands is more guaranteed. For the same brand of tea, try to choose spring tea and tender tea, or you can choose tea in the late spring tea.
Tea is safe to drink
In recent years, problems such as pesticide residues, lead, and excessive fluorine in tea have been reported frequently, which makes people often wonder whether to drink tea. Academician Chen said that the claim that tea is unsafe is often exaggerated, and tea can still be safely consumed.
There are basically no pesticide residues in the tea. Academician Chen introduced that the country currently has strict regulations on the scope of use, dosage and safety interval of pesticides. Before pesticides are registered for use, a large number of experiments must be carried out on them before they can be marketed. In addition, spot checks in recent years have shown that the qualified rate of tea pesticide residues has reached more than 97%. The most important thing is that we drink tea and do not eat tea. The pesticides currently applied to tea in China are basically fat-soluble and difficult to dissolve during tea brewing.
Choose between spring tea, black tea and green tea. If you are still worried about pesticide residues, it is recommended to choose spring tea, black tea and green tea. From June to September, serious pests and diseases are the main months for spraying pesticides. Before that, fewer spring tea pesticide residues have been on the market; green tea and black tea mostly use young leaves, while oolong tea and black tea mostly use old leaves. It comes from spraying, and part of it accumulates from the soil, so the later the picking, the higher the residual content of old leaves.
Drinking brick tea often may cause excessive fluoride. Appropriate amount of fluoride can help prevent dental caries, and excessive amounts can cause dental fluorosis. Green tea and black tea have lower fluorine content than oolong tea and black tea; the same type of tea has young leaves lower than old leaves. People who do not drink black tea or oolong tea often do not have to worry about excessive fluoride, but some ethnic minorities drink brick tea made of black tea every day and should pay attention to the problem of excessive fluoride.
There are regional differences in the heavy metal lead content. The heavy metal lead in tea mainly comes from soil, so there are regional differences in its lead content. At present, China stipulates that the limit value of lead in tea is 5 mg / kg, and the rate of exceeding the standard is generally below 2%. Overall, the level of lead residues in tea does not pose a threat to health.