1, eliminate fatigue and activate the brain.
2. Prevention of cancer: reduce the risk of intestinal cancer and rectal cancer.
3, remove oral odor: it can eliminate garlic smell.
4, promote blood circulation: (for people with healthy heart) can improve heart function and make blood vessels expand moderately.
5, rapid laxative: its laxative effect is only effective when drinking in the morning, and it is not effective at other times.
6, treatment of migraine: treatment of migraine, it is best to have a precursor to drink.
7, inhibit asthma: due to the stimulation of sympathetic nerve, can inhibit the excitement of parasympathetic nerve caused by asthma.
8. Reduce cholesterol: Caffeine can stimulate gallbladder contraction and reduce cholesterol that is easy to form gallstones in the gallbladder.
The harm of coffee:
1, heart
Caffeine acts on the heart in two ways: it not only affects the brain center that regulates the cardiovascular system, but also directly affects the heart. High dose of caffeine can increase 10~20 heart beats per minute in people who are intolerant of caffeine, and may make some people suffer from transient arrhythmia.
Therefore, moderate consumption of caffeinated drinks (up to 500 mg per day on average) will not greatly increase the risk of heart disease, but exceeding this dose may increase the risk of myocardial infarction.
2. Kidney
It is a common occurrence for many people to fall in love with the toilet after drinking coffee in the morning. This is because caffeine affects the adenosine receptor in the kidney and acts like a diuretic. Caffeine may also slow down the brain's release of an antidiuretic hormone that reduces urine production.
3. Digestive system
Acidity, oil and caffeine in coffee may stimulate gastric mucosa and promote gastric acid secretion. Drinking caffeine-containing drinks for a long time will lead to stomach problems.
4. Respiratory system
Caffeine and similar drugs have two effects on breathing. One is to increase the breathing rate. In addition, caffeine can relax the smooth muscle around the trachea, thus dilating the trachea and increasing the respiratory capacity. But caffeine can't be used as a medicine to treat asthma in clinic.
5. Reproductive system
Studies have pointed out that women who drink coffee during pregnancy give birth to babies with lower birth weight. Studies have also shown that taking caffeine (equivalent to drinking more than one cup of coffee a day) may significantly reduce a woman's chances of getting pregnant.
6. Eyes
Caffeine will shrink (narrow) the microvessels in the eyes, which will reduce the nutrients entering the cells of the eyes, and also reduce the rate of removing waste from the eyes.
Extended data:
Taboo for drinking coffee:
1, remember that coffee should not be taken with tea. Tannic acid in tea and coffee can reduce the absorption of iron by 75%. It is advisable to take it with warm boiled water.
2. Tannic acid in tea and coffee will reduce calcium absorption. Therefore, it is best to choose between two meals when drinking tea and coffee.
3. Caffeine-containing drinks and foods will cause nausea, vomiting, headache, rapid heartbeat and other symptoms after being drunk in large quantities by pregnant women. Caffeine can also enter the fetus through the placenta, affecting fetal development.
4. Many doctors believe that drinking 1~2 cups of coffee, tea or carbonated drinks every day will not affect the fetus. But for the sake of caution, it is best for pregnant women to ban it. Caffeine can lead to an increase in abortion rate, so you should drink decaffeinated drinks.
5. Children should not drink coffee. Caffeine can excite children's central nervous system, interfere with children's memory and cause ADHD.
6. Strong tea, coffee and carbonated drinks are also risk factors for the formation of digestive tract ulcer; Therefore, patients with stomach diseases should not drink more coffee.
7, coffee drinks contain caffeine, so it is easy to cause tinnitus.
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