source: family doctor online
the hot sun in summer, let the population dry tongue, people often choose to use cold drinks to relieve the summer, but many people do not know, in fact, tea can also play the role of summer heat, and drink tea more than the benefits of drinking ordinary drinks.
, what's the advantage of drinking tea in the summer? Specifically, there are the following aspects:
(1) drinking tea can heat the cooling and cool the thirst. The caffeine contained in tea can stimulate the central nervous system, enhance the excitement of the cerebral cortex, enhance the spirit, enhance the thinking, improve the efficiency of work and study, and the aromatic substances in tea are also a good coolant, which can remove certain heat from the hair holes of the skin during the volatilization process. In addition, the ammonia arbusic acid, water soluble pectin, tea polyphenols and aromatic substances in tea can stimulate the buccal membrane and promote the secretion of saliva.
(2) tea can supplement potassium and moisture. The sweat of people in summer is obviously increased. The potassium salt in the body will be lost with the excretion of sweat, and tea is potassium containing food. The average leaching of potassium in black tea is 24.1 mg of Kok tea soup, and green tea is 10.7 mg. In addition, a large amount of sweat from the body will cause insufficient water in the body, so it is necessary to continuously replenish the water.
(3) drinking tea can effectively prevent stomach and intestinal digestive tract diseases. Tea polyphenols in tea have strong bactericidal action, and are good for typhoid bacteria, cholera bacteria, dysentery bacilli and so on. Especially the catechin in tea polyphenols can kill or inhibit a variety of harmful bacteria, such as Vibrio cholerae, botulinum, Escherichia coli, Salmonella enteritis, Staphylococcus aureus and so on. So drinking tea can not only inhibit the growth of harmful bacteria, but also promote the proliferation of beneficial bacteria and improve the intestinal immune function.
but there are two sides to everything. Drinking tea is good for your health, but it is also fastidious. If you don't drink the right time, it may be harmful to your health.
it is best to avoid the following four periods of time:
fasting. Because the tea contains caffeine and other alkaloids, drinking tea on an empty stomach is easy to absorb too much caffeine in the intestine, which will cause some people to produce hyperactivity symptoms, such as panic, dizziness, weakness of hands and feet, and absentminded. People who drink less tea, especially drinking tea on an empty stomach in the morning, are more likely to suffer from these symptoms. This is called tea drunk. Once there is a phenomenon of drunk tea, it can be relieved by mouthing candy or drinking sugar water. For young people, the stomach and intestines of the elderly are more fragile. The middle-aged and elderly people with gastric and duodenal ulcers are more likely not to drink tea on an empty stomach, especially strong tea. Because too much tannic acid can stimulate gastrointestinal mucosa, resulting in exacerbation, and some may cause indigestion or constipation.
when you are drunk. Tea has the function of stimulating the nerve center. Drinking strong tea after drunkenness will aggravate the burden of the heart. For elderly people with poor heart and kidney function, they can not drink a lot of thick tea after drinking, and can use a large amount of fruit or small mouth to drink vinegar, in order to speed up the metabolic rate of the body and relieve the drunken.
sleep before sleep. Theophylline and other substances in tea are absorbed by the human body and have obvious excitatory effects on the central nervous system. Drinking tea will stimulate the spirit, affect sleep and even cause insomnia, especially the new green tea, which has more obvious effect. And tea has a diuretic effect, the elderly before going to bed drinking tea is also prone to frequent urination at night, affecting the quality of sleep.
medication period. Some elderly people with chronic diseases need long-term medication. Such as sedative hypnotic drugs, antiarrhythmic drugs and so on. Theophylline can reduce the analgesic effect of some drugs. Therefore, it is not suitable to drink tea when taking analgesic drugs.