Tea can repair DNA damaged by smoking

Business Club December 19 news tea health is a folk tradition in China What are the nutrients in tea, whether it can play a role in health preservation, and how to drink it to maximize the health preservation effect? In this issue, we invite the top domestic tea experts to answer these questions that you are most concerned about Cancer prevention is the main effect of tea Professor Han Chi, a researcher of nutrition and Food Safety Institute of China Center for Disease Control and prevention, has been engaged in the research of tea nutrition and efficacy for decades and is the leading tea expert in China He told reporters that at present, the more accurate health effects of tea are to prevent cancer (including lung cancer, esophageal cancer, liver cancer, colon cancer, etc.), regulate blood lipids, reduce blood sugar, enhance immune function, prevent smoking damage, etc "Drinking tea can repair the DNA damaged by smoking, and the effect is very good This is the conclusion we draw through human experiments, and it is also the leading conclusion in the world "Hanchi explained," there are many researches on tea around the world, but most of them are animal experiments, and they are made with tea extracts And we use the tea soup made by tea to carry out human experiments, proving that people can get such benefits as long as they insist on drinking tea correctly in daily life "Jiang Heyuan, deputy researcher of Tea Research Institute of Chinese Academy of Agricultural Sciences, who is mainly engaged in the research of tea and health, told reporters that there are various effective nutrients in tea, such as familiar tea polyphenols, theanine, vitamins, caffeine, etc "According to the principle of production, Chinese tea is divided into six categories, namely green tea, black tea, yellow tea, white tea, green tea and black tea Later, there were some reprocessed teas, such as Huacha, which were developed on the basis of six categories "Jiang Heyuan said that different kinds of tea have different effective ingredients and different effects Green tea protects the cardiovascular system Green tea belongs to non fermented tea, representing West Lake Longjing, Dongting Biluochun, Huangshan Maofeng, etc Its main effect is to prevent cancer and cardiovascular disease, but also antioxidant, improve immunity, inhibit and kill bacteria White tea relieves anxiety "According to different classification methods, white tea includes two kinds "Hanchi said that one kind of Anji white tea, which is more familiar to people, is actually a kind of green tea Because the taste is more mellow than green tea, it has become popular in recent years Jiang Heyuan said that the main effects of white tea are to protect brain nerves, enhance memory and reduce anxiety In addition, theanine in white tea can neutralize the action of part of caffeine, "people who are afraid of tea affecting sleep can drink some white tea "There is another kind of white tea produced in Fuding area of Fujian Province," which has less output and heavier taste than ordinary green tea In the current research, this kind of tea has a good effect on regulating immunity and lowering blood sugar, "Hanchi said Green tea and black tea reduce cholesterol Green tea belongs to semi fermented tea, its representative varieties are Wuyi Rock Tea (Dahongpao), Tieguanyin, frozen top oolong tea, Fenghuang Dancong, etc.; while black tea belongs to fully fermented tea, its representative varieties are Qihong in Anhui, Dianhong in Yunnan, and black tea in India and Sri Lanka is also famous in the world "As a result of fermentation, black tea is less irritating than green tea and has different efficacy, which can promote blood circulation and reduce cholesterol "Jiang Heyuan told reporters Black tea reduces weight and fat Black tea belongs to post fermented tea, the most familiar one is Pu'er tea, in which the total amount of tea polyphenols is high, which has a good effect of reducing fat and weight According to reports, Bernal of Henri Landau hospital in Paris? Professor Jia Ketuo gave 20 patients with too much blood fat three bowls of Yunnan Pu'er tea a day One month later, he found that the patient's blood fat was almost reduced by 1 / 4 According to Japanese health magazine, Pu'er tea can inhibit weight gain, reduce blood cholesterol and triglyceride "Some famous tea products, such as Mingqian tea in Longjing, have the same effective ingredients as ordinary tea, and the content may be different "Jiang Heyuan explained that before Ming Dynasty, because tea was picked early, the content of Theanine and vitamin C was high, while the content of tea polyphenols was low "For the sake of health preservation, you don't have to buy particularly expensive tea," Hanchi reminded So which kind of tea is the most nutritious? According to the two experts, in terms of the total amount of polyphenols, each kind of tea is almost the same However, because the processing technology of green tea is the simplest, the nutritional ingredients are better preserved How to drink tea for the best health after choosing the right tea, how to make it play the greatest effect, is also a knowledge "There are different ways to preserve, brew and drink different teas," Hanchi said "Preservation: tea is most afraid of damp and peculiar smell The best preserved containers are tin bottles, porcelain jars and colored glass bottles, followed by tins, wooden boxes and bamboo boxes, and plastic bags and cartons The container shall be dry, clean and free of peculiar smell The well preserved tea should be placed in a dry and ventilated place, not in a humid, high temperature, unclean, exposed place There should be no camphor, medicine, cosmetics, cigarettes, washing products and other articles with strong smell in these places The new green tea of that year can also be sealed and put into the refrigerator freezer for 3-6 months Brew: wash tea for up to 15 seconds "People like to wash tea now, but I don't agree with over washing tea "In our experiments, Hanchi said, we found that the extraction rate of the active ingredients of green tea is more than 70% after twice washing, and that of black tea is more than 60% That is to say, if we wash tea excessively, we will lose a lot of nutrients Jiang Heyuan warned that if tea had to be washed, the washing time should not exceed 15 seconds Green tea and white tea, it's better not to wash "But there is an exception People who are more sensitive to caffeine can wash it before drinking tea, because the caffeine in it leaches faster than tea polyphenols, and fast washing can remove part of caffeine "Drinking: 12g / day is the best Jiang Heyuan suggested that for ordinary people, it is appropriate to drink about 12 grams of tea a day and brew it in 3-4 times People who eat more greasy food and have a large amount of alcohol and tobacco can increase the consumption of tea appropriately Pregnant women and children, neurasthenia and tachycardia should drink less tea Han Chi reminded that with the popularity of kungfu tea, people drink tea "more and more hot", which is very wrong The loss outweighs the gain Incidence rate of cancer such as esophagus cancer is increased The best temperature for drinking tea should be about 60 ℃, not more than 70 ℃ "In addition, you can drink different kinds of tea at different times of the day: drink a cup of light green tea in the morning to refresh your mind; drink jasmine tea in the morning to improve your work efficiency; drink a cup of black tea in the afternoon to relieve your sleepiness and refresh your mind; gather with your friends or family at night to make a pot of Oolong or Pu'er, which will not affect your sleep We may as well have a try on this arrangement of tea drinking in one day It's no exaggeration to say that all the tea leaves are precious As long as we make good use of them, the tea that has passed the Qi can also give full play to the waste heat One is tea overnight Jiang Heyuan said that there is no harm in drinking overnight tea, but the tea is easy to oxidize, so there are often tea spots on the cup of overnight tea In addition, the high temperature in summer, tea is easy to be polluted by bacteria, moldy and rancid, leading to diarrhea, so it is better not to drink overnight tea in summer If you don't give up, you can also use it for the following purposes: 1 Overnight tea is rich in acids and fluorine, which can not only prevent capillary bleeding, but also play a role in sterilization and anti-inflammatory, such as oral bleeding, skin bleeding, etc you can use it to wash your hair and rinse; 2 Overnight tea can cure scalp itching; 3 Halitosis makes many people distressed If you use overnight tea to rinse your mouth three times a day, you will It can eliminate the trouble of halitosis Second, old tea and tea dregs People like Longjing pay attention to drinking the new tea of that year If they don't finish drinking, these tea can also play a role: 1 Making dishes When stewing meat or making other greasy and fishy dishes, you can put some tea, which has the effect of removing oil and removing greasiness; 2 The tea residue can be dried and collected, and made into tea pillow together with the old tea, which is especially suitable for summer use If the amount of tea is not enough, it can also be made into a small tea bag, which can be used for eye application to relieve visual fatigue; 3 After the tea has been soaked in the sun, it can be sprinkled in a humid place at home, such as under the bed, to absorb moisture.