There is a record in Lu Yu's "Tea Classics" of the Tang Dynasty: "Tea is for drinking, and it originated from Shennong's". Due to the imperfect scientific and technological knowledge of ancient people, exploring the effects of plants on human physiology is a blind and random practice process. With the continuous development of modern science and technology, the essence of tea has been gradually discovered, and its magical effects have also been promoted, allowing tea drinkers to enjoy the health of tea.

Since 2003, as a tea polyphenol that regulates blood lipids, was approved as a functional ingredient for specific health foods by the Ministry of Health and Welfare of Japan, tea polyphenols have developed rapidly in Japan and have been hailed as "good for health, beauty, longevity, and cancer prevention", in 2004 Has exceeded the scale of 7 billion yen.

In 2003, Japanese scientists published a comprehensive article on the effects of tea drinking on cancer and cardiovascular diseases. The results of a large number of epidemiological investigations proved that drinking tea can indeed prolong life and summarize the impact of drinking green tea on Japanese life. It also provides new evidence for advocating "tea as a national drink".

The research has been conducted for 13 consecutive years, and 8552 middle-aged and elderly people over the age of 40 were surveyed. They were divided into three groups: drinking less than 3 cups of tea a day, 4-9 cups and more than 10 cups. The average age of the survey subjects was : 4108 males were 52.6±0.2 years old, 4444 females had an average age of 54.8±0.2 years. The 13-year follow-up survey recorded the occurrence and death of cancer and cardiovascular diseases. Because the mortality caused by these two diseases accounted for more than 50% of the total mortality. The results of a 13-year study showed that in terms of cancer, men and women who drink more than 10 cups of tea a day (150ml per cup) are 4.1 years and 7.6 years later than those who drink less than 3 cups of tea a day. At the age of death due to cancer, men and women who drink more than 10 cups of tea a day (150ml per cup) are 3.9 and 5.9 years later than those who drink less than 3 cups of tea. The effect of delaying the onset of cancer and mortality is more pronounced in people younger than 79. The effect of age greater than 79 years is less obvious. Smokers can also delay the onset of cancer due to tea drinking, but it is not as obvious as non-smokers. In terms of the effect on cardiovascular diseases, it has been determined that drinking tea can reduce total cholesterol, triglycerides and arteriosclerosis index. Men and women who drink more than 10 cups of tea a day have 58% and 82% lower risk of cardiovascular disease than those who drink less than 3 cups of tea. At the age of death due to cardiovascular disease, the males who drink less than 3 cups, 4-9 cups and more than 10 cups of tea are 74.9±2.0 years old, 76.2±1.3 years old, and 76.8 years old, and the female population is 79.5 years old. Years old, 80.6 years old and 80.9 years old. The general conclusion is that the standard amount of tea consumed by the human body is the daily intake of tea soup equivalent to 400-750 mg of total tea polyphenols in Japan. This amount can significantly reduce the incidence of cancer and cardiovascular diseases, and delay the time of occurrence and death, and extend the life of a person. The conclusion is that when the age has reached 80 years, the effect of drinking tea is not obvious, but for people younger than 79 years old, tea drinking can prolong the life of tea drinkers through its curative effect on cancer and cardiovascular diseases. Therefore, drinking tea can indeed prolong life.