Some researchers conducted a long-term follow-up observation of 17,000 men and women aged 40-65 years, and found that those who drank more than 6 cups of green tea a day reduced their risk of diabetes by 33% than those who drank less than 1 cup a week. There is also information that using cold boiled green tea to drink, the effect of preventing and treating diabetes is better. Tea has a protective effect on brain cells. Tea can good tea effectively delay brain degradation and help maintain the health of brain blood vessels. Recent research shows that drinking more tea can improve memory and prevent Alzheimer's disease.