The function of tea, the health benefits of tea and natural, bioactive compounds in tea, as essential elements in a healthy lifestyle is best explained by the first line in Kakuzo Okakura’s 1906 philosophical treatise on tea, The Book of Tea. Okakura sums up the historical and ancient belief in tea as more than just a pleasing beverage by writing, "Tea began as a medicine and grew into a beverage."
Scientific research confirms what Asians believed for centuries – that green and black tea contain powerful natural antioxidants which can protect regular tea drinkers from many degenerative diseases.
The main degenerative diseases of concern today are heart disease, high blood pressure, stroke, cancer and diabetes. Studies have shown that the antioxidant activity of flavonoids in green and black tea reduces the risk of many degenerative diseases and help maintain good oral health.