Benefits: 1. Coffee contains certain nutrients. Nicotinic acid in coffee contains vitamin B, and the content of roasted coffee beans is higher. And there are free fatty acids, caffeine, tannic acid and so on. 2. Coffee is good for the skin. Coffee can promote metabolic function, activate digestive organs, and has great effect on constipation. Taking a bath with coffee powder is a kind of thermotherapy, which has the effect of losing weight. 3. Coffee has the function of hangover. Drinking coffee after drinking will quickly oxidize acetaldehyde converted from alcohol, decompose it into water and carbon dioxide and excrete it. 4. Coffee can relieve fatigue. To eliminate fatigue, we must supplement nutrition, rest and sleep, and promote metabolic functions, and coffee has these functions. 5. Three cups of coffee a day can prevent gallstones. For caffeinated coffee, it can stimulate gallbladder contraction and reduce cholesterol that is easy to form gallstones in bile. Recently, researchers at Harvard University in the United States found that men who drink two or three cups of coffee a day have a lower chance of getting gallstones than 40%. 6. Drinking coffee often can prevent radiation injury. Radiation damage, especially the radiation of electrical appliances, has become a prominent pollution at present. Indian atomic researchers in Baba got this conclusion in mouse experiments and said it can be applied to humans. 7. The health care function of coffee. Coffee has the functions of resisting oxidation, protecting heart, strengthening bones and muscles, benefiting waist and knees, stimulating appetite, promoting food intake, eliminating fat and food stagnation, inducing resuscitation and removing dampness, promoting blood circulation and removing blood stasis, calming wind and stopping spasm. 8. The influence of coffee on mood. Experiments show that the average person absorbs 300 milligrams (about 3 cups of brewed coffee) a day, which will have a good influence on a person's alertness and mood. Disadvantages of drinking coffee for a long time 1. Adding caffeine when you are nervous will help improve your alertness, sensitivity, memory and concentration. But if you drink more coffee than you are used to, you will have the same dose of stimulants, which will cause nervousness. For people who tend to have anxiety disorders, caffeine can make the symptoms of sweaty palms, palpitations and tinnitus worse. 2. Aggravating hypertension Caffeine is often combined with other simple painkillers because of its analgesic effect. However, if you take it in large quantities for a long time, if you already have hypertension, using a large amount of caffeine will only make your situation worse. Because caffeine alone can raise blood pressure, and if it is combined with emotional tension, it will have a dangerous multiplication effect. Therefore, people at risk of hypertension should especially avoid drinking caffeinated drinks when working pressure is high. Some people who have the habit of drinking coffee all the year round think that they are immune to the effect of caffeine, but this is not the case. A study shows that after drinking a cup of coffee, the blood pressure can rise for as long as 12 hours. 3. Caffeine, which induces osteoporosis, has a good diuretic effect. If you drink a lot of coffee for a long time, it will easily lead to bone loss, which will have an adverse effect on the preservation of bone mass. For women, it may increase the threat of osteoporosis. But the premise is that people who don't get enough calcium in their food at ordinary times, or people who don't move often, and women after menopause, lose calcium due to lack of estrogen, which, together with a lot of caffeine, may pose a threat to bone. If you can enjoy it in a reasonable amount, you can still do it without choking. The following six kinds of people should not drink coffee and suffer from hypertension, coronary heart disease, arteriosclerosis and other diseases-drinking coffee for a long time or in large quantities can cause cardiovascular diseases. Older women-coffee will reduce calcium and cause osteoporosis. After menopause, women need to add ten times the amount of calcium every day. Patients with stomach trouble-drinking too much coffee can make stomach trouble worse. Pregnant women-drinking too much coffee can lead to fetal malformation or miscarriage. Vitamin B 1 deficiency-vitamin B 1 can maintain the balance and stability of the nervous system, and coffee can destroy it. Cancer patients-drinking too much coffee is dangerous to normal people. Advantages 1. Drinking tea can reduce the weight of catechins, cholestenone, caffeine, inositol, folic acid, pantothenic acid and other components contained in tea, which has the effect of preventing and inhibiting obesity under the comprehensive action. In Japan, I especially like oolong tea from China. Because oolong tea has a strong role in decomposing fat, it can help relieve greasy, help digestion and lose weight. Dr Carobbi, clinical director of the Department of Medicine of Saint-Antoine, confirmed that drinking Pu 'er tea produced in Yunnan often can reduce triglyceride and cholesterol in human body. French women, especially young women, pay great attention to physical beauty. They call Pu 'er tea "slimming tea". French doctors experimented with Pu 'er tea. Each subject drank three cups of Pu 'er tea every day for one month. As a result, some people lost weight, while others reduced their blood lipids. French doctors also experimented with Yunnan Tuocha on 40 obese men and women, and asked them to drink a cup of Tuocha every morning, afternoon and evening. After a month of continuous use, more than 40% of them lost weight to varying degrees. This is one reason why French people like to drink Yunnan tea. According to the function of tea to lose weight, tea has become the main raw material of "slimming tea" and "bodybuilding tea". Second, drinking tea can prevent tooth decay. Drinking tea or gargling and brushing your teeth with tea can not only eliminate bad breath, but also prevent dental caries. It is reported that Dacheng Zhou, M.D., Beijing Stomatological Hospital, has been studying the efficacy of tea in preventing dental caries since 1970s, such as drinking tea, gargling with tea soup, brushing teeth, or using toothpaste containing tea, but brushing teeth with tea soup is the best. This is because tea contains fluorine, which has great affinity with calcium in teeth and can become a kind of "neon apatite" which is difficult to dissolve in acid. Just like adding a protective layer to teeth, it improves the ability of teeth to prevent acid and caries. Using tea to prevent caries is one of the ways to protect teeth. Therefore, gargling, brushing teeth and drinking tea with tea soup can be popularized among children. In low fluorine areas, it is recommended to drink ordinary low-grade tea (high-grade tea and famous tea have low fluorine content) to prevent dental caries. Drinking10g of tea soup every day can meet the human body's demand for fluoride. Tea with high fluorine content includes Fujian Oolong Tea, Yunnan Tea, Dianhong Tea, Zhejiang Tea, Jiangxi Jasmine Tea and Guizhou Brick. Third, tea can prevent cardiovascular diseases. Drinking tea can also reduce cardiovascular diseases such as hypertension and cholesterol. A clinical trial was conducted on 80 patients with hypertension. As a result, after five days of treatment with green tea, 30 patients' blood pressure decreased and some returned to normal. Some people also studied the relationship between tea drinking and coronary heart disease, and divided it into three groups: no tea drinking, occasional tea drinking and frequent tea drinking. It was found that the incidence of coronary heart disease was 3.1%for non-tea drinking, 2.3% for occasional tea drinking and1.4% for frequent tea drinking. We can see the effect of drinking tea on preventing coronary heart disease. Fourth, tea is a good medicine for intestinal diseases. Zhang Zhongjing, a doctor, said: "Tea is very effective in treating pus and blood." Modern medical research has confirmed that tea is a good medicine for intestinal diseases. Polyphenols in tea can solidify and precipitate protein. Tea polyphenols combined with single-celled bacteria can coagulate the egg itself and kill the bacteria. If the harmful cholera bacteria, typhoid bacilli, Escherichia coli, etc. are soaked in strong tea soup for a few minutes, most of them will lose their mobility. Therefore, Chinese medicine and folk often use strong tea or grind green tea to treat intestinal diseases such as bacterial dysentery and enteritis. The method is 3 grams of tea, a bowl of water, decocted three times a day; Or take a cup of strong tea and 20 ml of vinegar three times a day; You can also take tea leaves and shepherd's purse flowers15g, decocted and taken three times a day before meals. Secondly, when making tea with water, if the drinking water is unclean, the tea leaves can absorb impurities in the water and precipitate them, which has the functions of purification and disinfection, which is good for preventing intestinal infectious diseases. Side effects are easy to occur when drinking a lot of strong tea regularly. For example, it is easy to dilute gastric juice and cannot be digested normally. The normal gastric juice secreted by a person every day is 1.5-2.5 liters, which can reasonably digest the food that a person takes in every day. When drinking a lot of strong tea, it will dilute the gastric juice, reduce the concentration of gastric juice, so that gastric juice can not digest food normally, resulting in indigestion, abdominal distension, abdominal pain and other symptoms, and some even cause duodenal ulcer. In addition, tea hinders the body's absorption of iron. Tea contains tannic acid, black tea contains about 5%, and green tea contains about 10%. When people drink a lot of strong tea, the combination of tannic acid and iron will be more active, which will bring obstacles and influence to the absorption of iron and make people show iron deficiency anemia. And drinking strong tea is easy to cause constipation. Tannic acid in tea can not only combine with iron, but also with protein in food to form a massive tannic acid protein, which is not easy to digest and absorb, leading to constipation. For the elderly with constipation, constipation will be more serious. Finally, strong tea causes high blood pressure and heart failure. Caffeine in strong tea can make the human heart beat faster, thus raising blood pressure; At the same time, a large amount of strong tea liquid enters the blood vessels, which can increase the burden on the heart, produce discomfort symptoms such as chest tightness and palpitation, and aggravate the degree of heart failure. Everything is measured. Drinking light tea can keep you healthy, while drinking strong tea is harmful to your health.