Why is coffee bad for your health? What are the chemical components?

1. Supplementing 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 tension. For people with anxiety tendency, caffeine can aggravate the symptoms of sweating, palpitation and tinnitus. 2. 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. 3. Caffeine inducing osteoporosis has a good diuretic effect. If you drink a lot of coffee for a long time, it will easily lead to bone loss and adversely affect the preservation of bone mass. For women, it may increase the threat of osteoporosis. 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. In addition, 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. = = = The health rules of drinking coffee, advantages and disadvantages. Look at the appropriate bitterness, rich and mellow, fascinating. This is the charm of coffee. Especially when it turns cold, a cup of hot and fragrant coffee will naturally bring warmth to my heart. Whether you are tired from walking, finding a place to sit down and rest, finding a good place to chat with friends, or finding a good way to refresh yourself in the office, people can't help but want to get close to coffee. However, how to drink coffee is healthy? Who is not suitable for drinking coffee? 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. It's best to drink coffee after breakfast and lunch at coffee time, because it can promote gastrointestinal peristalsis, help digestion, and decompose the high-calorie and high-fat food you eat, and it won't 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.