Coffee and healthy coffee are recognized as healthy drinks.

Coffee is recognized as a healthy drink, but drinking coffee must be reasonable and scientific in order to be beneficial to health.

When it comes to coffee, people will think of caffeine. Caffeine is a softer stimulant in coffee, which can improve the body's sensitivity, attention, metabolism, mental state and physical fitness. At present, caffeine has been found in about 60 plant species, of which tea and coffee are the best known.

The caffeine in coffee is difficult to dissolve in cold water, but easily soluble in hot water. Caffeine stimulates the cerebral cortex, eliminates drowsiness, increases feeling and thinking and acts as a cardiotonic agent to regulate heart function, as well as dilating kidney blood vessels and diuresis. Usually, a cup of coffee contains 60-65mg caffeine. However, excessive caffeine intake is prone to tinnitus and myocardial hyperactivity (the heart beats rapidly, the number of pulses increases), and the pulse is uneven, so you must drink coffee in the right amount.

Having a drink after getting up in the morning is a wake-up call. A light sip at work during the day can refresh you, and the coffee can be a little stronger. It is advisable to drink coffee slightly after dinner or in the evening. Both coffee and tea have refreshing effects, but they are not suitable for drinking during meals and should be drunk after meals. Some friends like coffee very much, but they are afraid that they will get angry if they drink it often. We often see many people order coffee, this way of drinking coffee is not easy to be healthy. Should be served with a cup of white water when tasting coffee, this has two advantages: first, drink a mouthful of white water before tasting coffee, flush away the bad smell in the mouth, and then taste will feel mellow. Second, due to the diuretic function of coffee, drink more white water to improve urination and promote renal function. In this way, not only taste the delicious coffee, but also do not have to worry about getting angry, it is really killing two birds with one stone.

As long as the right amount of coffee is good for human health. The human body usually consumes nearly 500 to 600 milligrams of caffeine a day, which is equivalent to about five cups of coffee. There will be no side effects in this range. But the metabolism of pregnant women is a little slow, drink less. Coffee is an indispensable healthy drink for us.

The efficacy of coffee

Alcohol or tobacco can be intoxicating and exciting, just as caffeine can be exciting. Caffeine, due to the role of stimulating the central nervous system or muscle, can restore muscle or fatigue, improve work efficiency, and have a sober effect that can make the mind respond more lively and sensitive.

On the other hand, it can also improve the function of the heart, dilate the blood vessels, improve the blood circulation, calm the headache and relax the spirit. It also helps to stimulate the sympathetic nerve and suppress the excited asthma of the parasympathetic nerve. Coffee also has the effect of helping digestion, especially when eating too much meat and gastric juice, promoting digestion and preventing gastroptosis. As caffeine can break down fat, after eating high-calorie food, Western writers must want a cup of coffee. Caffeine can eliminate the effect of garlic and contain betel nuts, so coffee is an indispensable drink after tasting the food.

Coffee also has a deodorizing effect. Use the residue of ground coffee to dry in a container and put it in the refrigerator or shoe box as a deodorant. Sprinkling it on an ashtray can also eliminate tobacco pooh. Coffee can also be used to hide the taste. For example, instant coffee is melted in boiling water, so that its taste on the meat can become a sweet and delicious meat dish.

Coffee and the influence of people's emotions

Professor A.P.Smith of the University of Bristol (University of Bristol) published his 10-year talk about the effects of coffee on brain nerves, especially on cognitive emotions. Measure their discrimination and alertness for 30 minutes before and after drinking coffee. Smith found that after drinking a cup of coffee, they become more alert and more focused. Professor Smith said that coffee can really refresh you, especially if you don't get enough sleep, such as a cold that makes you unable to sleep or insomnia. and you have to concentrate on work or exams during the day, then drinking a cup of coffee will certainly boost your alertness and tide you over the difficulties. And coffee will stay in the body for 2 to 5 hours, so coffee has a long-term refreshing effect. Further experiments have found that the average person can absorb 300 milligrams of caffeine (about three cups of brewed coffee) a day, which will have a positive effect on a person's alertness and mood. However, more than 400 milligrams (four cups) of caffeine will bring negative effects, bad mood, irritability, will invade others, cause trouble. If you only want to eat coffee polyphenols as an antioxidant, then all you have to do is remove "fdecaf" coffee!

The study also found that coffee drinkers were less likely to develop Parkinson's disease. Scientists at the Veterans Management Medical Center in Honolulu, Hawaii found that people who did not drink coffee had a five times higher risk of developing Parkinson's disease than those who drank more than five cups of coffee a day. The researchers followed more than 8000 men for 30 years, and their findings were published in the Journal of the American Medical Association. Parkinson's disease is a kind of senile disease with neurological lesions. The typical symptoms include limb tremor, stiffness, decreased autonomic activity and so on. It is not clear why coffee drinking may reduce the risk of Parkinson's disease. But they speculate that the caffeine in coffee may prevent damage to the nerve cells that cause Parkinson's disease. Scientists point out that their current results are preliminary and need to be confirmed by further research. They stressed that it is too early to recommend coffee as a treatment for Parkinson's disease.

Coffee and prevention of gallstones

Delicious coffee is a refreshing drink, and new research has found that drinking a few cups of coffee can prevent gallstones. Harvard University researchers found that men who drank two or three cups of coffee a day were 40 percent less likely to develop gallstones than those who did not drink coffee, while men who drank more than four cups of coffee a day were 45 percent less likely to get gallstones, according to the Journal of the American Medical Association. However, decaffeinated coffee does not have this effect. Only caffeinated coffee can stimulate gallbladder contraction and reduce the cholesterol in which bile content is easy to form gallstones. Other drinks such as tea and cola, which also contain caffeine, cannot achieve the same effect because their caffeine content is lower than that of coffee.

Antioxidant and cardioprotective function of coffee

In addition to being refreshing, coffee contains polyphenols that not only have antioxidant effects, but also protect cardiovascular functions. At the symposium on food chemistry at the annual meeting of the American Chemical Society, there is new scientific evidence that coffee contains powerful antioxidants that protect the heart and blood vessels. The study was conducted by University of Scranton, Pennsylvania, USA. These polyphenols, sometimes known as yellow stalk compounds (flavonids), are powerful antioxidants that fight oxidation and blood coagulation.

Coffee and prevention of radiation injury

Radiation injury has become a prominent pollution and harm at present. Especially the radiation of household appliances: such as people who operate telephones for a long time, microwave ovens, televisions at home, and so on. Radiation, especially for pregnant women, has affected the health of the next generation. Reports in this area are not uncommon. Indian scientists have found that coffee protects experimental mice from radiation and may have the same effect on humans. Researchers at the Barba Atomic Research Center in India found that 70 per cent of caffeine-injected mice survived 25 days after receiving generally lethal doses of radiation, while all of the uninjected mice died. Caybilico, who led the study, said the findings may also apply to humans. "the study does show that coffee may help prevent injuries," he said.

Does coffee cause calcium loss?

In recent years, as Chinese people pay more and more attention to the problem of calcium loss and osteoporosis, they also have considerable doubts about coffee. as for the relationship between caffeine intake and osteoporosis, it is still under continuous research. at present, there is no direct evidence that caffeine can lead to osteoporosis, but some studies have shown that caffeine increases calcium excretion. Therefore, it is suggested that coffee lovers should eat more high-calcium foods to supplement calcium, such as preparing cheese slices or cheesecake with coffee, which can not only supplement calcium, but also make the coffee more delicious.

Who is not fit to drink coffee?

Patients with cerebral hemangioma are not suitable for drinking coffee. Patients with heart disease should drink coffee without or without caffeine, because caffeine increases the heart rate and causes lack of oxygen in the heart. In addition, patients with skin diseases and those with stomach problems should drink as little coffee as possible so as not to worsen their condition due to excessive consumption. People with diabetes should also avoid drinking coffee with too much sugar so as not to aggravate the condition. The US Food and Drug Administration (Fda) has issued a statement advising women who are or may be pregnant to reduce their caffeine intake. This is because during the second and third stages of pregnancy, women metabolize caffeine about twice as fast as when they are not pregnant. Moreover, caffeine crosses the placenta into the fetus and flows into the baby through breast-feeding. In addition, many studies have failed to prove that moderate amounts of caffeine have adverse effects on fetuses, and there are no medical reports banning pregnant women from drinking coffee. It is still recommended that pregnant women and breast-feeding women should be more cautious about their caffeine intake. In short, if you find that you are not feeling well after drinking coffee, you should not drink coffee for the time being, and then start with a small amount, changing the way you drink it, and so on.