It is an indisputable fact that tea has made a very important contribution to human health. However, before the19th century, no one could clearly tell us why tea has so many functions, and its scientific truth has always been confusing. Since the 1960s, the field of tea science, which has accumulated 5000 years of human practical achievements, has ushered in the era of exploration of natural science theory. A large number of tea component analysis methods and separation and identification technologies have developed rapidly, and its main components such as catechin, theaflavin, theanine and caffeine have been identified one by one and industrialized. At the same time, a series of advanced science and technology, such as chemical engineering, molecular biology, cell biology, biochemistry, nutrition, clinical medicine and so on, have been involved in the research of China tea, which has quickly opened the door to the mystery of tea health preservation, and the theory of ancient tea science has been developed unprecedentedly.
Today is the era of tea, people's demand for healthy life is more and more urgent, and how to guide daily healthy lifestyle with scientific theory is paid more and more attention. Among them, because tea is the medicine and food homologous plant closest to our life, we advocate scientific tea drinking. Therefore, it is the need of the times to systematically introduce the relationship between tea and nutrition, tea and health.