Research has also found that drinking the right amount of caffeine every day has the effect of speeding up metabolism, promoting digestion, improving constipation, boosting spirits, and relieving pain. On the psychological level, drinking coffee is a kind of enjoyment, can also relieve stress, relaxation, but also will stimulate gastrointestinal peristalsis, produce laxative effect. Drinking it after a meal promotes the secretion of gastric juices, so it helps digestion. Medical research has pointed out that coffee beans contain sugar, protein, fat, potassium, crude fiber, water and other nutrients. In addition, coffee also contains caffeine, tannins, alkaloids and other components that are beneficial to human health. Many studies have pointed out that drinking coffee in moderation, i.e., two to four cups a day, can stimulate the sympathetic nervous system and produce the effect of refreshing and reducing fatigue; it also relaxes blood vessels, promotes blood circulation, prevents cardiovascular disease, and also helps to constrict the arteries in the head, which helps to relieve migraine headaches. Although coffee has many benefits, it is undeniable that coffee is not without its drawbacks, and drinking too much of it can be harmful to the body. Studies have found that in countries where coffee is consumed in large quantities, there is a common problem of "iron deficiency anemia" because coffee affects our body's absorption of iron. Caffeine contained in coffee stimulates our central nervous system, causing restlessness, anxiety, insomnia, and also stimulates stomach acid, increasing fatty acids and glucose in the blood. Some foreign studies have found that women who drink too much coffee will cause bone loss; some studies have shown that people with high blood pressure should drink less coffee, and if they drink two or three cups of coffee a day, it will increase their blood pressure. In addition, there are also studies pointing out that drinking too much coffee will cause the rise of bad lipids sterols, and it was later confirmed that it is not the caffeine that causes the increase of serum cholesterol, but the coffee bean oil. It is not difficult to remove the bean oil, as long as you use a filter paper when making coffee, you can filter out the oil. Studies have also found that excessive consumption of caffeine can discolor teeth and make them more susceptible to arthritis, as well as stimulate the release of bile hormones, which promote the contraction of the gallbladder, and for those who have gallstones and have had colic, drinking coffee may aggravate the symptoms. Caffeine can also cause an increase in the resistance of the carotid artery, which reduces blood flow to the growing fetus, affecting the supply of nutrients and oxygen, which may be the reason why coffee causes babies to lose weight or pregnant women to miscarry. It is worth noting that drinking too much coffee may get cardiovascular disease, the American Journal of Clinical Nutrition has published a study, drinking more than two hundred per day more than two hundred sissies men and women **** 3,000 people, found that coffee drinkers inflammatory indicators, including the reaction protein C, tissue necrosis factor, and the number of white blood cells, etc., than those who do not drink coffee was a meaningful rise, and the more coffee, the higher the index rose. The higher the inflammatory index, the higher the risk of cardiovascular disease in the future. Therefore, it is recommended that people with arrhythmia or cardiovascular disease should drink less coffee. In addition, people with too low potassium ions should not drink coffee because coffee has a diuretic effect, which will drain potassium ions from the body and affect kidney function. Excessive poisoning Coffee, like drugs and food, can cause poisoning in excess. Drinking coffee is good for health, but from a medical point of view, it is better not to drink it because it is easy to get addicted to coffee. Don't drink too much. Drinking more than 1,000cc per day has reached the standard of poisoning, and even anesthetic agents are ineffective. For the sake of her health, she is slowly reducing the amount of coffee she drinks, and now she only drinks about 700 cc a day. Coffee, like drugs and food, can lead to poisoning when consumed in excess. A while ago, there was a case of an artist drinking coffee to lose weight, causing serious side effects. Drinking large amounts of caffeine, more than 5 grams to 10 grams per day (more than 45 cups of 150cc drip-ground coffee or more than 23 cups of 300cc mugs per day), may cause generalized convulsions, coma, severe cerebral edema, low blood potassium, or cardiac arrhythmia, cardiac paralysis, and may lead to the risk of death. Not only coffee, but also commercially available caffeine-containing beverages should not be consumed in excess every day. If the daily intake of caffeine is more than 500mg to 1,000mg (one gram), and if you drink more than 4 cups of 150cc drip ground coffee or more than 2 cups of 300cc mugs every day, you will experience mild caffeine intoxication, such as irritability, anxiety, irritability, palpitations, nausea, and diuretic effects due to an increase in urinary intake. The diuretic effect of increased urination. Drinking large quantities of coffee can lead to poisoning, and long-term caffeine consumption can also lead to addiction. The greater the daily intake of caffeine, the greater the chance of addiction, and the faster the speed. Coffee addicts will have headaches, fatigue, yawning and other withdrawal symptoms once they stop drinking coffee, but as long as they can tolerate it, they can return to normal after a few days of non-drinking. Coffee Tips: Do not drink more than 4 cups of drip-ground coffee (e.g., Americano, latte, cappuccino) per day to prevent mild intoxication. If symptoms such as restlessness, anxiety, irritability, palpitations, nausea, etc. occur after drinking coffee, it is best not to drink cola, tea, and other beverages containing morphine caffeine on the same day. According to a recent research report in 2004, caffeine can be absorbed by babies through the placenta and enter their bodies, jeopardizing their brains and hearts, so it is best for pregnant women not to drink coffee. Teenagers under the age of 18 are still developing and it is best to drink less caffeinated beverages. Drinking coffee in the morning helps to clear the mind, but not on an empty stomach, so as not to hurt the stomach and intestines. People with duodenal ulcers should avoid drinking coffee on an empty stomach. Do not smoke or drink alcohol immediately after drinking coffee, otherwise it will promote blood circulation to increase cardiovascular burden, which is not conducive to heart health. Although caffeine can boost the spirit, but drink too strong or drink too much instead will make people become impatient, understanding is weakened. Drinking coffee is best with creamer, can ease the stimulation of the stomach, but to control the intake of sugar to avoid obesity. If people with gallstones drink too much coffee, they may experience pain because the caffeine stimulates the gallbladder to contract. Therefore, it is best for people with gallstones not to drink coffee. Drinking time is key For healthy people, the biggest bad thing to say about caffeine is that it may make people like to drink it constantly. Coffee has its advantages and disadvantages, how to take its benefits and avoid the many disadvantages? This must be explored in terms of coffee drinking time, habits and intake. The time to drink coffee is very important. Drinking coffee one hour before a meal will not reduce the absorption of iron, but drinking coffee one hour after a meal will reduce the body's ability to absorb iron. Drinking coffee on an empty stomach will stimulate the stomach and cause discomfort. In order not to stimulate the stomach and not to reduce the absorption of iron, it is recommended to drink coffee thirty minutes after meals. Is it better to drink it in the morning or in the afternoon? It varies from person to person, because everyone's tolerance of coffee is different, some people drink in the afternoon at night can not sleep, but some people drink before going to bed still sleep, she believes that coffee fans should control their own time to drink coffee, so as not to enjoy the aroma of the coffee, must endure the pain of insomnia. Concentration affects health In terms of coffee-drinking habits, different brewing methods will affect the absorption of iron. A cup of "drip coffee" will reduce the absorption rate of iron from 5.88% to 1.64%, and if drinking instant coffee is worse, it will reduce the absorption rate of iron to 0.96%, and when the concentration of coffee is doubled, the absorption rate of iron is even reduced to 0.53%. In addition, the contents of the traditional creamer are actually more vegetable oils than dairy products, and it is recommended that fresh milk and milk powder be used instead of creamer to replenish the calcium that may be lost when drinking coffee. It is worth noting that the gastrointestinal system is not good enough people can not add too much sugar, so as not to cause gastrointestinal stimulation, gastrointestinal people, after noon should reduce the consumption of coffee, so as not to cause gastrointestinal discomfort. It is advisable to keep it in the refrigerator Many people are too troublesome and like to buy a lot of coffee beans at a time, or grind 300 to 400 grams of coffee beans into powder and put it at home, which will easily deteriorate the coffee and produce carcinogens. In a hot and humid climate, coffee beans can easily produce ochratoxin at room temperature. For example, some coffee shops expose coffee beans to the air, and the ochratoxin bacteria remaining in the coffee beans can easily multiply and produce ochratoxin under sufficient humidity and room temperature. Excessive intake of ochratoxin will not only cause kidney disease, but also found to have the risk of miscarriage, liver damage, and carcinogenicity in animal studies. To avoid consuming ochratoxin, it is safer to store unfinished coffee beans or coffee powder in a sealed container in the refrigerator. Coffee beans are easily spoiled. It is best to keep coffee beans or coffee powder in the refrigerator and drink it all within a month, otherwise the coffee will deteriorate and produce carcinogens. The best way is to take out the beans from the refrigerator to grind them only when you want to drink coffee every day, and brew the freshest immediately. The effects of coffee on the human body Benefits of coffee Weight loss Drinking coffee can eliminate fat and get rid of fat? Nutritionists say that drinking coffee can speed up the body's metabolic rate by 3 to 4%, increase the rate of calorie consumption by the body, and help weight control. But the premise is to drink black coffee, if you add sugar and creamer, a packet of sugar packets and creamer balls about 50 calories, 6 cups of coffee a day, there are 300 calories, if there is no moderate exercise, but easy to get fat in the long run. Pain Relief Caffeine has a pain relieving effect, such as cold syrup contains caffeine has this effect. People with migraine can drink coffee to solve this problem, the effect is good. However, it is best to drink it at the time of the aura, because it takes 10 to 30 minutes after drinking it for the effect to take place. The bad side of coffee induces breast cancer Caffeine will stimulate the mammary glands, leading to breast fibrocysts, and even transformed into breast cancer.