One: the efficacy of green tea and black tea: green tea: anti-aging, antibacterial, lipid-lowering, slimming, dental caries prevention, halitosis removal, whitening, ultraviolet protection, can improve indigestion. Black tea: It can help digestion, stimulate appetite, induce diuresis, eliminate edema and strengthen heart function. Disease prevention: black tea has strong antibacterial ability. Gargling with black tea can prevent colds caused by viral diseases, prevent tooth decay and food poisoning, and reduce blood sugar and hypertension. Two: all kinds of tea have various functions, see what effect you need to achieve, and then drink it selectively. Several teas are recommended for health and longevity: Acanthopanax senticosus is a perennial herb belonging to the same family and genus as ginseng, and it is also called Acanthopanax senticosus because of its similar efficacy to ginseng. The famous doctor Bielu recorded that Acanthopanax senticosus has the efficacy of "replenishing middle energizer, strengthening bones and muscles, and strengthening will". So the ancients said, "happy ever after, it is better to get a five-plus." Modern pharmacological studies have confirmed that Acanthopanax senticosus can enhance immune function, increase blood flow, improve blood supply to the heart and brain and regulate blood pressure. It also has a good therapeutic effect on sexual dysfunction, impotence and premature ejaculation. Acanthopanax senticosus can be decocted in water to make tea, or taken after crude drug 1000 ml, 100 days, each time 15 ~ 35 ml, daily 1 time. Wearing clothes often can make middle-aged and elderly people strong and moist. Chrysanthemum tea is made of chrysanthemum and tea, which has obvious health care function and can be taken in all seasons. There are many varieties of chrysanthemums, most of which are white chrysanthemums used as tea. White chrysanthemum has the effects of expelling wind, improving eyesight and detoxifying. Modern medical research has confirmed that the effective rate of Baijuhua concentrated decoction in treating coronary heart disease and angina pectoris is 43.3%, and it also has obvious effects of dilating coronary artery and increasing blood flow. Tea leaves are slightly sweet, slightly cold, fragrant and pungent, clearing away heat without hurting yang, and being pungent without hurting yin, which has the miraculous effect of waking the stomach and pleasing the spleen, and can break the summer heat, eliminate miasma and purify the stomach and intestines. Caffeine contained in tea can excite the higher nerve center, and theophylline can dilate the coronary artery of the heart. In addition, tea also has diuretic and bactericidal effects. In short, drinking chrysanthemum tea regularly and in moderation can play a role in disease prevention and health care. It can be described as "two chrysanthemums and a pinch of tea, clearing liver and improving eyesight, and prolonging life". Cassia cassia is a mature seed of Cassia cassia in Leguminosae. Shennong's Herbal Classic lists it as the top grade, and says that it can cure all eye diseases. "Long-term service is beneficial to the body and the body is strong and healthy." There was an old man in ancient China who had bright eyes and good health because he often drank osmanthus tea. So he wrote a poem praising him: "A fool is eighty years old, and his book is full of flies at night." It's not good eyesight, just eating for a long time. "Cassia seed contains emodin, cassia seed, chrysophanol and other substances, which can protect the optic nerve and treat cataract, glaucoma and conjunctivitis. It has good curative effect on red eyes, swelling and pain, shame and tears caused by liver fire or wind-heat of liver meridian. Cassia seed can also be used for constipation caused by heat and constipation caused by intestinal dryness. Cassia seed also has the effect of inhibiting the growth of staphylococcus and contracting uterus, lowering serum cholesterol and blood pressure, and has certain curative effect on preventing and treating arteriosclerosis and hypertension, which is suitable for middle-aged and elderly people to take for a long time. Cassia seed is good for both oral and external use, which can reduce swelling and detoxify, treat headache with hot compress on temples, and treat epistaxis with Baihui point. As a pillow, it can cure head wind, improve eyesight and help sleep. Tea instead of tea, oral administration is better. The preparation method of cassia seed tea is as follow: stir-frying clean cassia seed with low fire, frequently turning with a shovel, and stir-frying until tender yellow. When making tea, take 20 grams and put them in a teacup and soak them in boiling water, which is similar to making tea. After 20 minutes, the brown color changed from light yellow to deep yellow, and the fragrance was overflowing. When washed again, it is dark yellow, thick as amber, and fragrant.