Tea has been known to man for more than 3,000 years. It is believed that its consumption gives vigor, beauty and longevity, and protects against disease. A high quality tea leaf that is properly brewed stimulates brain activity, improves metabolism, strengthens immunity, and prevents urolithiasis and the formation of cholesterol plaques. The polyphenols in tea leaves have antitumor, antioxidant and antibacterial properties. Tea is rich in vitamins and mineral salts. It is worth noting that only freshly brewed tea is beneficial. There is a saying in China that yesterday’s tea is like snake poison.