I. Drinking coffee benefits caffeine because of its role in stimulating the central nervous system and muscles, so it can invigorate the spirit, enhance the ability to think, and restore muscle fatigue. Acting on the cardiovascular system, it can improve heart function, stretch blood vessels and promote blood circulation. For the gastrointestinal system, it can help digestion and fat decomposition.1. Caffeine can accelerate the decomposition of fat, but at the same time more dependent on the movement of the muscles, in order to convert excess fatty acids into heat energy consumption, if there is no movement with it, excess fatty acids flow back down the bloodstream, and re-accumulation of fat. Therefore, after drinking coffee, you need to actively move at the same time, in order to play a real weight loss effect! Coffee itself has calories, but not much, the main calories are in your coffee when you add creamer and sugar. 2. antioxidant capacity of a few days ago, a research report pointed out that coffee contains antioxidants 4 times more than tea, better able to fight against cardiovascular disease, and the coffee itself is also in line with the principle of antioxidants, the color (dark) and has a bitter taste. The antioxidant content of each coffee varies according to the way it is brewed, for example, Americano contains the least amount of antioxidants, while Espresso contains the most antioxidants. Coffee in the addition of creamer, will not affect its antioxidant effect. 3. Improve dry eyes foreign reports pointed out that: coffee drinkers suffer from dry eyes, the chances of dry eyes, significantly lower than those who do not drink coffee. This is mainly related to the purine component of coffee (eye drops containing purine, can stimulate the glands to secrete liquid, the eyes have some kind of protective effect). For the love of coffee for computer users, this is of course good news, but it should be noted that the coffee itself has a diuretic effect, even if some of its components have a protective effect, but for people who have suffered from dry eye, as well as taking any medicine containing diuretic ingredients, must be prohibited from taking caffeinated beverages, so as not to exacerbate the loss of water in the body. 4. can relieve the pain of a night of no sleep brought about by The headache, or temple side due to vasoconstriction caused by pain, these non-organic factors caused by pain, can be relieved by coffee, but must be in the morning or noon drink (Note: Afternoon to night prohibited). 5. amount of coffee coffee on the human body of course has the benefit of coffee, but can not drink more than 2 cups a day is appropriate for those who are prone to nervousness and anxiety, drinking too much may be harmful. 6. drinking coffee time drinking coffee is best at breakfast and at the same time. Time to drink coffee is best after breakfast and lunch, because this can promote gastrointestinal peristalsis, help digestion, can break down eaten high-calorie, high-fat food, and will not be like drinking coffee on an empty stomach, caused by stimulation of the stomach. It is best not to drink coffee after dinner for fear that it will have an impact on sleep. If you want to stay up all night by drinking coffee, you may drink too much without realizing it, which is not good for your health. II. Drinking coffee is bad 1. Caffeine helps to improve alertness, sensitivity, memory and concentration when you are nervous. However, drinking more coffee than you are used to will result in nervousness similar to consuming the same dose of stimulants. For people who tend to suffer from anxiety disorders, caffeine can cause sweaty palms, palpitations, and ringing in the ears, all of which can be exacerbated.2 Exacerbating High Blood PressureCaffeine, because of its pain-relieving properties, is often combined with other simple painkillers, but when taken in large quantities over a long period of time, and if you already have high blood pressure, using large quantities of caffeine will only worsen the situation. Because caffeine alone can raise blood pressure, and when combined with emotional stress, it can have a dangerous multiplying effect, people at risk for high blood pressure should especially avoid caffeinated beverages during stressful times at work. Some people who have the habit of drinking coffee all year round think that they have been immune to the effects of caffeine, however, this is not the case, a study shows that after a cup of coffee, the time of elevated blood pressure can be as long as 12 hours. 3. induce osteoporosis caffeine itself has a very good diuretic effect, if a long period of time and a large number of drinking coffee, it is easy to cause bone loss, the preservation of the bone will be negatively impacted for women, may increase the osteoporosis, the bone loss of the bone will have an adverse effect on the preservation of the bone. , may increase the threat of osteoporosis. However, the premise is that the usual food originally lacks the intake of sufficient calcium, or infrequent movement of people, coupled with post-menopausal women, due to the lack of estrogen caused by the loss of calcium, the above conditions plus a large amount of caffeine, may pose a threat to the bone. If you can enjoy it in reasonable amounts, you can still do it without choking. Three. These people drink coffee with caution 1. Liver disease patients caffeine will prolong the time of caffeine in the body Xie. General metabolism of caffeine in normal adults need 2 hours, but patients with liver disease or liver insufficiency, the metabolism of caffeine may take 4-5 hours, so patients with liver disease should be careful when drinking coffee, it is best not to drink in the evening, so as not to affect the metabolism of long time to sleep, and a day is best to not more than 1 cup. 2. digestive disorders in patients with the reason why the coffee is listed in it, is because of which the tannic acid will stimulate the stomach acid. The tannic acid will stimulate gastric acid secretion, if it is the acute stage of digestive disease patients must be avoided. After the recovery of health, if you occasionally drink coffee, it is also best to use after meals, to avoid drinking coffee on an empty stomach. 3. Pregnant women many women from the beginning of pregnancy, all the food eaten into the food will pay special attention to caffeine-containing beverages are also listed as one of the contraindications. This is mainly due to the slow metabolism of caffeine for pregnant women, caffeine stays in the body for a longer period of time, the fetus in the womb to eight or nine months, to be able to metabolize, clear the caffeine in the blood. 4. children due to the incomplete development of children's livers and kidneys, the detoxification ability of the poor, so that caffeine metabolism of the half-life of caffeine will be prolonged, so in general, children under the age of 12 years old need to prohibit the intake of caffeine. So, generally speaking, children under 12 years old need to prohibit the intake of caffeine. Even if you drink coffee as water all day long in Europe and the United States, there are very strict restrictions on children drinking coffee.