In the current international trade of tea, the largest is black tea, accounting for about 70% of the total international trade in tea. In China, the output of black tea in 2015 was 258,000 tons, accounting for only 11.33% of China's tea production. The production technology and drinking culture of black tea originate from China. According to the "Chinese Black Tea" written by Gong Zhi, "In the year of 1610, the Dutch East India Company transported Wuyishan black tea to the Netherlands; in 1618 and 1650, it was transported to Britain and Western Europe one after another. And North America. Since then, it has stimulated the vigorous development of world black tea production, trade, and consumption since the middle of the 19th century. It has also made black tea the most fashionable drink in Europe, the United States, and Russia." In the 17th to 19th century, China had dominated the world's black tea trade. From 1840 to 1880, the average annual export volume of Chinese black tea accounted for more than 80% of the world total. Although China has made important contributions to the development of black tea in the world, Chinese people generally prefer to drink green tea. In 2015, the output of green tea in our country was 1.438 million tons, accounting for 63.14% of the total tea production. Green tea belongs to unfermented tea and has a natural and refreshing taste. Compared with fermented black tea, the former is more in line with the elements of Chinese traditional culture, such as returning to nature and being authentic. However, drinking black tea correctly will benefit people's health. Black tea can relieve osteoporosis in women during menopause "Black tea helps to improve osteoporosis symptoms such as joint pain and increase bone density. At the same time, it can improve menopausal symptoms such as insomnia, unstable blood pressure, and irritability." October 18, Wang Xuanjun, Director of Tea Engineering Center, Yunnan Agricultural University, Yunnan Province At the press conference for the scientific research achievement of Linyi City Lai Black Tea announced five years of scientific research results of him and his team. The results mainly come from the experiment of his research team on rats. Wang Xuanjun's team first removed the ovaries of rats and let their estrogens fall rapidly. Then they gave mice rats black tea, green tea, and cooked Puer tea, and then tested the relevant body indicators of the rats to obtain experimental results. The results showed that alkaline phosphatase (a component that causes damage to bone), the weight of the femur (big bone in the body of a rat), and osteocalcin (an important hormone regulating bone growth) were consumed in mice that drank these three kinds of tea for a long time. Bone mineral density and other indicators have improved; after monitoring the mice drinking three different types of tea, it was found that black tea is more effective than green tea and Puer tea to increase the level of estrogen in ovariectomized osteoporotic rats. Relieve osteoporosis symptoms. In an interview with the China Youth Daily and China Youth Online reporter, Wang Xuanjun said that black tea can promote the secretion of endogenous estrogen and promote the active secretion of estrogen. Drinking Black Tea Correctly Helps Improve Sleep Quality Wang Xuanjun's team also conducted a small-scale human trial. The results of the trial showed that 80% of the women tested had improved sleep symptoms after drinking a certain dose of black tea. In an interview, he said that the United Kingdom is also the country that began to do black tea research earlier in the world. According to their findings, women who regularly drink black tea have fewer symptoms associated with menopause than women who do not drink black tea. According to reports, black tea contains amino acids, mainly including gamma-aminobutyric acid and L-theanine. These two kinds of amino acids are natural, non-protein amino acids and are effective in improving sleep, lowering blood pressure, reducing stress, and preventing Alzheimer's disease. . The content of these two amino acids in black tea is up to 1500mg/100g. Wang Xuanjun said that through research, the more tender black tea, the higher the content of “sleeping amino acidsâ€. Tea contains exciting caffeine. Wang Xuanjun said that if the drinking method is correct, black tea can help improve sleep quality. The researchers first brewed the black tea with boiling water at 95 degrees Celsius. After 5 minutes of the first bubble, the test found that the dissolution rate of amino acids in the black tea was 54.47%, and the dissolution rate of caffeine was 31.4%. The dissolution rate of amino acids increased by 19.69%, and the dissolution rate of caffeine was 15.9%. At the third bubble, the dissolution rate of amino acids was only 3.95%, and the dissolution rate of caffeine was 10.65%. It can be seen that the dissolution rate of the first two bubbles of black tea is higher than that of caffeine, so you want to improve the quality of sleep by drinking black tea. Just drink the first two bubbles and the third bubble will make people drink more. Excited. According to Wang Xuanjun, they usually drink black tea to mice in a way that they usually make tea. White rats can basically keep their excitement for 3 hours, but if they only drink the first two black teas, they will soon be quiet. “γ-aminobutyric acid is known as the 'switch for deep sleep in humans', and γ-aminobutyric acid has been used as a dietary supplement in primary school students in Japan to improve sleep and improve memory,†said Wang Xuanjun. Wang Xuanjun suggested that drinking about 5 grams of black tea a day, preferably in the afternoon 3 to 4 points, so not only in line with the rhythm of the human body, and during this time drinking black tea, which can be about 3 hours of caffeine metabolism In part, it can better play the role of sedation and sleep aid, which is similar to the English afternoon afternoon tea at 4 o'clock in the afternoon. 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