Common sense that coffee is not suitable for people with heart disease

Coffee is one of the three famous drinks in the world. Because coffee is closely related to people's daily life, the relationship between coffee and health has always been concerned by scientists. Raw coffee contains 6.5% protein, 11% fat, sugar inorganic salts and multivitamins, as well as alkaloids such as caffeine, which is as high as 1.5%. Pure caffeine is a kind of white crystal with bitter taste, is a mild stimulant, can excite the cerebral cortex, drink a moderate amount of caffeine can exhilarate the spirit, dilate the bronchi, improve blood circulation and aid digestion, and improve the sensitivity of the brain response. In recent years, studies have shown that caffeine can inhibit the absorption function of gallbladder and inhibit the formation of gallstones. Scientists tested microbes with coffee and found that almost all microbes were killed by coffee at different times. For example, Bacillus anthracis was killed in 3 hours, Vibrio cholerae was killed in 4 hours, Streptococcus was killed in 24 hours, and resistant Bacillus could be eliminated in 28 days. The germicidal effect of coffee mainly depends on caffeine. When drinking coffee, you should pay attention to the following five "inappropriate".

Coffee is not suitable for people with heart disease

Coffee is similar to adenine nucleoside in structure, but has the opposite effect on the human brain. Adenosine can reduce brain excitement, while caffeine has a refreshing effect. Brain cells have receptors that specifically accept these substances, and caffeine can occupy these receptors after entering brain cells, so that adenine has nowhere to live and cannot reduce brain excitation. however, coffee drinkers' consumption and coffee concentration must continue to increase in order to continue to reach an exciting level, otherwise the exhilarating and refreshing effect will gradually diminish. In addition, drinking a lot of coffee for a long time will also increase the concentration of cholesterol in the body. It was found that people who drank 1-4 cups of coffee a day had 5% higher blood cholesterol levels than non-coffee drinkers, while those who drank more than 6 cups a day had 11% higher blood cholesterol levels than non-coffee drinkers. A survey in the United States shows that a person who drinks five cups of coffee a day is twice as likely to have a heart attack as a non-drinker. If a coffee drinker smokes at the same time and suffers from high blood pressure, high cholesterol and age, he will be more likely to have a heart attack. In order to reduce the risk of heart attack, coffee drinkers should reduce smoking, control a high-cholesterol diet, and pay close attention to coffee intake.

Second, do not drink too much coffee

The caffeine in coffee stimulates adrenaline, causing tension in skeletal muscles and slow response to fatigue, making the body restless all the time. Caffeine can also lead to genetic diseases, the mechanism is that caffeine may combine with deoxyribonucleic acid, causing cells to mutate. Researchers in Switzerland found that if you drink about 1000 milliliters of espresso within three hours, most of the vitamin B1 in the body is destroyed. German researchers have found that there is a major difference in chemical composition between coffee and tea, which makes too much coffee at risk of cancer. Therefore, drinking coffee should not be excessive. Too much caffeine can lead to insomnia, neuroticism, irritability, anxiety, arrhythmia and circulatory disorders. The total daily intake of caffeine should not exceed 1250 mg, which is equivalent to 2-3 cups of coffee. Note, however, that drugs such as Coca-Cola, tea, chocolate and aspirin also contain caffeine, so these factors should be taken into account when estimating the total daily coffee intake.

Third, the elderly should not drink coffee often.

Scientists at Washington State University in the United States have found that drinking coffee regularly reduces calcium in the body. They studied 135 subjects and found that coffee drinkers had a 1-fold increase in urinary calcium, which was due, on the one hand, to an increase in urine volume and, on the other, to an increase in urinary calcium concentration. Modern medical research believes that the demand for calcium in old age is gradually increasing, especially in elderly women. Relevant statistics show that about 25% of women over the age of 60 suffer from osteoporosis. Therefore, if elderly women like to drink coffee, it will aggravate the lack of calcium in the body, so that bones due to lack of calcium and osteoporosis, prone to fracture. Therefore, the elderly should not often drink coffee.

Coffee is not suitable for pregnant women

Caffeine is more harmful to pregnant women, it will not only have a harmful effect on the pregnant women themselves, but also endanger the fetus, cause congenital deformities, and cause preterm delivery, dystocia and so on. In 1980, the US Food and Drug Administration proposed that pregnant and lactating women should ban coffee because caffeine can enter the fetus through the placenta, causing fetal deformities. Caffeine can also enter the baby's body through breast milk, causing intestinal spasm and abdominal cramps. Researchers at Yale University in the United States also pointed out that women who drink too much coffee give birth to small babies. Among the women who drank three cups of coffee a day, 7.3% of the babies weighed less than normal babies, were not as lively as normal babies, and did not have strong muscle development. To this end, they gave pregnant women advice not to drink coffee.

Coffee is not suitable for infants and young children

Infants and young children are particularly sensitive to caffeine and are easy to get excited, lose their temper, make noise and lose sleep after drinking coffee. If children drink coffee for too long, they can become addicted to it. Coffee contains an alkaloid that can combine with calcium, which causes calcium to be excreted from urine and stool after drinking, so blood calcium decreases after drinking. As the alkaloids in coffee can destroy vitamin B1, infants often drink coffee, which will cause vitamin B1 reduction, light irritability, loss of appetite, memory loss, constipation, and severe multiple neuritis, heart enlargement and limb edema. Therefore, infants and young children should not drink coffee.