The most convenient and beneficial beverages are plain water and light tea, which are the necessities of life. Make sure you drink enough water every day, especially in summer, when drinking too little water is not good for your health. Older people drink more water, which is good for excretion of phlegm and keeping bowel movements smooth and speeding up metabolism. Older people have reduced activity, slow movement and slow blood flow, coupled with high blood viscosity, prone to brain and limb thrombosis. Therefore, to develop good drinking habits, drink water regularly, preferably in addition to three meals a day, drink soup, drink some water at 10:00 a.m. and 3:00 p.m. every day and at night when you get up, do not wait until you are thirsty to drink a full meal. Drinks containing more sugar can not drink more, especially people with diabetes and coronary heart disease is best to drink plain water or light tea. Tea to green tea is good, green tea can significantly reduce serum and liver cholesterol levels, is the ideal, natural, safe green drink for the treatment of hypertension and hyperlipidemia. Gargling with black tea has the effect of preventing influenza and anti-caries, so in the high season of influenza, you should always drink black tea or insist on gargling with black tea. However, the elderly should pay attention to the following points when drinking tea: ① Do not drink strong tea, because strong tea contains a large amount of caffeine, easy to drink excitement, leading to insomnia and restlessness, but also can cause tachycardia and arrhythmia. ② have peptic ulcer, should not drink strong tea, because tea has the effect of vasodilatation, easy to cause gastrointestinal bleeding. In addition, drinking tea immediately after meals is also a bad habit. ③ Do not drink tea before going to bed, because it can cause insomnia and increased nocturnal urination. In addition, the tannic acid in tea has an astringent effect, which can be combined with many drugs (Pansentin, Huangbiansu, digitalis, sleeping pills, etc.), affecting its absorption and efficacy. ④ habitual constipation people should not drink tea. Because the tannic acid in tea can make the stool constipation. Especially do not drink overnight tea, because all the tannic acid in the tea is leached, the composition of the tea changes, the human body is not beneficial.