Coffee may keep you awake at night, or it may raise your blood pressure. However, Professor Martin, director of the coffee research institute of Vanderbilt University in the United States, recently said that coffee contains hundreds of healthy ingredients, which can resist liver injury, various cancers, asthma, heart disease and paralysis. He pointed out that it is beneficial to drink 2-4 cups of coffee every day. People who don't drink coffee are more likely to suffer from these diseases than those who drink coffee. Studies in recent 20 years have confirmed that caffeine is an effective component in coffee, which can activate the central nervous system, and can be used to make long-term analgesic drugs, which can resist drowsiness, colds, asthma and edema. Its side effects are addiction, insomnia, nervousness and high blood pressure. Studies have shown that coffee contains anti-dementia substances, which can reduce the impact of harmful substances on the body and help prevent some diseases. Scientists say that when oxygen in the human body is mixed with other chemicals, it will form harmful substances that blindly destroy cells and body tissues, which is the cause of heart disease, vascular disease, tumor, decline of immune mechanism and neurasthenia. The research results of the American Coffee Institute show that coffee contains four times as many anti-dementia substances as tea. Nutrition plays a major role in strengthening the body's disease prevention mechanism. The substances that can resist dementia include vitamin E, vitamin C, carotene in soybean, red wine, some seasonings, fruits, onions, olives and so on. Roasted coffee beans are more resistant to dementia, and this substance in decaffeinated coffee will not be weakened or destroyed. At the same time, experts point out that drinking a cup of coffee in the morning can refresh you, and drinking coffee during the day can refresh you. So coffee can be a little stronger at this time. It is best to have a little coffee after dinner or in the evening. Coffee is recognized as a healthy drink, but drinking coffee should be controlled for a certain time. Coffee or tea should not be used with meals, but should be drunk after meals. When drinking coffee, whether it is hot or cold, you should drink some boiled water. First of all, it can remove the odor in the mouth to get a better taste; Second, because coffee has diuretic effect, drinking more white water can improve urination and protect renal function, and you don't have to worry about getting angry when drinking coffee. Black coffee has always been called "the messenger of health", and its main effects on health are as follows: 1. Caffeine can stimulate the central nervous system, make the mind clearer, have abundant thinking ability, concentrate and improve work efficiency; 2. Caffeine can make muscles contract freely and improve motor function. 3. appetizing and digestion caffeine stimulates gastrointestinal secretion of gastric acid, which can promote intestinal peristalsis, help digestion, prevent gastroptosis and have a rapid laxative effect. 4. Liqiao dehumidification caffeine can promote renal function, discharge excess sodium ions in the body, increase urination and improve abdominal distension and edema. 5. The linoleic acid contained in the coffee for promoting blood circulation and removing blood stasis has the functions of hemolysis, preventing thrombosis, enhancing vasoconstriction, relieving migraine and reducing the probability of stroke. 6. Pingfei Dingchuan Caffeine can inhibit parasympathetic nerve and reduce asthma attacks. 7. Dry deodorized caffeine contains tannin, which has a strong adsorption capacity for taste. If your room has just been renovated, make a pot of coffee indoors, and the taste will be quickly removed. 8, drinking coffee can protect the liver and hangover. 9, coffee can lose weight The best time to drink coffee to lose weight is 30 minutes after lunch to 1 hour and before going to work, taste a cup of rich sugar-free black coffee, with walking, can promote fat burning. 10, black coffee can effectively improve hypotension. 1 1, black coffee has antioxidant effect, which helps to prevent cancer and resist aging. Coffee, we have been talking about it from an emotional point of view. Today, let's take a look at its essence. 1. Coffee contains some nutrients. Nicotinic acid in coffee contains vitamin B, and roasted coffee beans have higher content. But also 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 play a great role in constipation. Bathing with coffee powder is a kind of hyperthermia, which has the function of losing weight. 3. Coffee has the function of relieving alcoholism. Drinking coffee after drinking will quickly oxidize acetaldehyde converted by 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. Three cups of coffee a day can prevent gallstones. For caffeinated coffee, it can stimulate gallbladder contraction and reduce cholesterol which is easy to form gallstones in bile. Recently, researchers at Harvard University found that men who drink two or three cups of coffee a day have a lower risk of gallstones than 40%. 6. Drinking coffee regularly can prevent radiation injury. Radiation hazards, especially electrical radiation, have become the prominent pollution at present. Baba's Indian atomic researchers reached this conclusion in mouse experiments and said it can be applied to humans. 7. The health function of coffee. Coffee has the functions of resisting oxidation, protecting the heart, strengthening bones and muscles, benefiting the waist and knees, stimulating appetite, promoting eating, reducing fat and digestion, inducing resuscitation and removing dampness, promoting blood circulation and removing blood stasis, calming wind and relieving spasm. 8. The influence of coffee on mood. Experiments show that the average person absorbs 300 mg (about 3 cups of brewed coffee) every day, which will have a good influence on a person's alertness and mood. The following six kinds of people should not drink coffee: suffering from hypertension, coronary heart disease, arteriosclerosis and other diseases-drinking coffee for a long time or in large quantities will cause cardiovascular diseases. Older women-coffee can reduce calcium and cause osteoporosis. After menopause, women need to supplement ten times as much calcium every day. Patients with stomach trouble-drinking too much coffee will 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 keep the balance and stability of the nervous system, and coffee can destroy it. Cancer patients-drinking too much coffee is dangerous for normal people. Close contact with coffee caffeine can stimulate the central nervous system and muscles, so it can refresh the mind, enhance thinking ability and restore muscle fatigue. Acting on the cardiovascular system can improve heart function, relax blood vessels and promote blood circulation. For the gastrointestinal system, it can help digestion and help the decomposition of fat. I believe many people have heard that drinking black coffee can lose weight. In fact, this is only one of the factors. Caffeine can really accelerate the decomposition of fat, but at the same time, it needs to rely on muscle movement to convert excess fatty acids into heat energy for consumption. If there is no coordinated exercise, excess fatty acids will flow back along the blood stream and accumulate fat again. Therefore, after drinking coffee, you need to exercise actively at the same time in order to have a real weight loss effect! Coffee itself has calories, but not much. The main calories are the creamer and sugar you add when you drink coffee. Antioxidant capacity In recent years, all foods with antioxidant function have become popular in the market. Foods rich in vitamins A, C and B in vegetables and fruits, as well as tea, which is quite popular in Japan, are regarded as healthy foods because they are rich in antioxidants and can resist the harm of free radicals to the human body. A few days ago, a research report pointed out that the content of antioxidants in coffee is four times that of tea, and it has stronger resistance to cardiovascular diseases. Moreover, coffee itself conforms to the principle of antioxidants, with darker color and bitter taste. Each coffee contains different antioxidants because of different brewing methods. For example, American coffee contains the least antioxidants, while espresso contains the most antioxidants. After adding creamer to coffee, its antioxidant effect will not be affected. It has been reported abroad that people who drink coffee are significantly less likely to suffer from dry eye than those who don't drink coffee. This is mainly related to the purine component in coffee (eye drops containing purine can stimulate glands to secrete liquid, which has a certain protective effect on eyes). This is of course good news for computer people who love to drink coffee, but it should be noted that coffee itself has diuretic effect, even if some of its components have protective effect, people who have already suffered from dry eye and those who have taken any drugs containing diuretic components must be forbidden to take caffeinated drinks so as not to aggravate the loss of water in their bodies. It can relieve headache caused by poor sleep all night, or pain caused by vasoconstriction on one side of the temple. The pain caused by these non-organic factors can be relieved by coffee, but it must be drunk in the morning or at noon (note: drinking is forbidden from afternoon to evening). The amount of coffee is good for the human body, but you should not drink too much. It is advisable to drink no more than 2 cups a day. For people who are easily nervous and anxious, drinking too much may be harmful. When drinking coffee, it is best to drink coffee after breakfast and lunch, because coffee can promote gastrointestinal peristalsis, help digestion, decompose the high-calorie and high-fat food you eat, and will not irritate your stomach like drinking coffee on an empty stomach. It is best not to drink coffee after meals, for fear of affecting sleep. If you want to stay up late by drinking coffee, you may unconsciously drink too much, which is not good for your health. Supplementing caffeine when you are nervous is helpful to 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 tension. For people with anxiety tendency, caffeine can aggravate the symptoms of sweating, palpitation and tinnitus. Caffeine, which aggravates hypertension, is often combined with other simple painkillers because of its analgesic effect. However, if you take a lot of caffeine for a long time, if you already have high blood pressure, using a lot of caffeine will only make your situation worse. Because caffeine alone can raise blood pressure, if combined with emotional tension, it will have a dangerous multiplier effect. Therefore, people at risk of hypertension should especially avoid drinking caffeinated drinks when working pressure is high. Some people who drink coffee all the year round think they are immune to the effects 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. 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 adversely affect the preservation of bone mass and may increase the threat of osteoporosis in women. However, the premise is that people who usually have insufficient calcium intake in food, or people who don't exercise often, and postmenopausal women, due to insufficient estrogen, calcium loss, coupled with a large amount of caffeine, may pose a threat to bones. If you can enjoy it in a reasonable amount, you can still do it without choking. These people are careful to drink caffeine from patients with coffee liver disease, which will prolong the time of caffeine death in the body. It takes 2 hours for normal adults to metabolize caffeine, but it may take 4-5 hours for patients with liver disease or liver insufficiency. Therefore, patients with liver disease must be careful when drinking coffee, and it is best not to drink it after the evening, so as to avoid the long metabolism time affecting sleep, and it is best not to exceed 1 cup a day. Patients with digestive diseases believe that people who often have stomachaches and stomach problems have an experience, and doctors will definitely tell them not to eat irritating foods, including wine, peppers, coffee, tea and carbonated drinks. Coffee is one of them, because its tannic acid can stimulate gastric acid secretion. If you are a patient with acute digestive system diseases, you must avoid drinking it. After recovery, if you drink coffee occasionally, it is best to use it after meals to avoid drinking coffee on an empty stomach. Pregnant women Many women will pay special attention to all the foods they eat after pregnancy, and caffeinated drinks are of course listed as one of the taboos. This is mainly due to the slow metabolism of caffeine in pregnant women, which will prolong the time of caffeine staying in the body, while it takes eight or nine months for the fetus in the abdomen to remove caffeine from the blood through metabolism. Children's half-life of caffeine metabolism will be prolonged due to incomplete liver and kidney development and poor detoxification ability, so generally speaking, children below 12 need to ban caffeine intake. Even Europeans and Americans who drink coffee as boiling water all day have strict restrictions on children's drinking coffee. adopt

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