One of the reasons why green tea is considered healthy is that it is rich in polyphenols, so in principle, seniors can drink green tea as long as it is of assured quality, such as Longjing tea and Xinyang Maojian. Green tea contains a large number of polyphenols, which are health-friendly components of green tea. Drinking green tea in moderation can replenish the tea polyphenols, vitamin C, caffeine, elemental fluorine and other nutrients in it, as well as increase the intake of water. Elderly people should drink green tea, firstly, they should drink it in moderation to avoid excessive theophylline in it affecting their sleep at night; secondly, they should avoid drinking it on an empty stomach to avoid indigestion, abdominal distension and other problems. If the elderly friends appear to be unwell, they should seek medical attention in time, food can not prevent and treat diseases, only supplemental nutrition.