A few days ago, it was very hot. The temperature of people in the south once reached 39 degrees. At home, there is no air conditioner, and everyone is sweating in every pore, which is unbearable. When I brought the child back from the outside, the child cried, "grandma, I'm dying of thirst." Give me some water. " Grandma hurried out of the house and said as she walked, "Don't panic, don't panic, grandma will pour you hot water!" " The child said, "I don't want to drink cold water." I want to eat ice cream I am so hot that I drink hot water. " Grandma stopped: "That won't do. The child has a bad stomach. Eating ice cream and drinking ice water will give them diarrhea! You wait, grandma will pour you hot water! "In grandma's consciousness, freshly boiled water kills bacteria and parasites through high temperature, which is more conducive to good health and health preservation, while cold water is heavy and hurts the spleen and stomach. Drinking hot water in summer is better than drinking cold water to quench thirst and relieve summer heat. Drinking hot water has many benefits. Drink more hot water in summer. So is drinking hot water really so beneficial? Let's analyze the advantages and disadvantages of drinking hot water! Is hot water really better than cold water to cool down? Professor Peter McNaughton, a neuroscientist at Cambridge University, once said: When drinking hot water, the nerves in the mouth and upper digestive tract will respond to the heat of water, and the brain will make sweat glands produce more sweat at a faster speed. We all know that when you sweat a lot, your body surface temperature will naturally drop, because sweat glands are widely distributed on your body surface, and you will naturally feel cool with the evaporation of a lot of sweat. When people drink hot water, the nerves in the oral cavity and upper digestive tract will quickly rush to the brain and produce more sweat, so scientists' research results show that sweating is the best way to keep cool in summer. Many people will say, "When I am too hot, a bottle of cold drink makes me much cooler." In fact, drinking cold drinks will only partially cool the body, but has no obvious effect on the whole body temperature, just from the mouth to the esophagus. In this way, it is obviously reasonable for grandma to say that it is better to drink hot water in summer, but it also depends on the score. Normal people have it, but children don't necessarily have it. For example, when we take our children to play in the community, many grandmothers bring hot water. Seeing the children running full head and sweating, he said to them, "Come, drink some hot water to quench your thirst and reduce your fever." As we all know, in the same environment, the baby's metabolism is more vigorous, coupled with the baby's constant exercise, it will sweat more than adults, enough to take away the temperature of the baby's body surface and achieve the effect of cooling down. If you give the baby hot water at this time, the body will secrete more and make it sweat more, which will undoubtedly increase the burden of the child's metabolism. If these calories cannot be released from the body in time, they will accumulate in the body, making the body temperature unbalanced and more prone to heatstroke. So under normal circumstances, it's just to cool down and cool off the heat. Drinking hot water does make sense, but it is not the same. Should be treated specifically. Does drinking cold water really hurt the spleen and stomach? A friend of mine just came back from abroad and asked her what was her biggest feeling abroad. She told me: "I, who was fed hot water by my mother since I was a child, asked someone else for hot water when I went abroad. It's really hard, and I'm looked down upon stupidly!" It turns out that the necessary hot water kettle for every room in China Hotel does not exist abroad, and no hotel will provide you with water boiling service. Foreigners drink water directly from the tap. Why do foreigners not have the habit of drinking boiled water? Is it really because foreigners and China people have huge physical differences, and foreigners are in good health, so their spleen and stomach can stand cold water? We don't deny that this is related to the cultural and physical differences between China and the West. Western countries like to eat beef, mutton, milk and eggs, which makes their bodies very hot and dry. If they drink hot water every day, their health will definitely be unbearable. Of course, this is not only a historical reason, but also closely related to eating habits and living habits. However, I think there is also a water quality problem here. The most basic premise for them to drink ice water is the appearance of direct drinking water, but China has not yet developed a perfect urban direct drinking water system. When I was a child, I lived in the countryside. Every family, adults and children, grew up drinking cold water. At that time, our domestic water was all spring water "pressed" from the ground by the old "killing well". After finishing farm work in summer, I went home, poured a ladle of water into my mouth with a ladle, and half of it splashed on my face, and the whole world immediately became cold. At that time, despite the lack of medical facilities, people seldom got sick, not to mention diarrhea and gastrointestinal discomfort never happened. From this point of view, it seems meaningless that cold water hurts the stomach, because from a medical point of view, no matter how many degrees of water, even 0 degrees of water, has been warmed from the mouth and reached the stomach through the esophagus. There is no such thing as "cold hurts the stomach". The Hong Kong Department of Health also said that if you want to drink frozen milk, you don't need to heat it, because babies can drink frozen milk directly. How did the habit of drinking hot water come into being in China? We have a long habit of drinking hot water in China for at least several thousand years. According to the pottery unearthed in China, a French archaeologist once concluded that the habit of drinking hot water in China has a history of 4000 years, and this drinking habit is also recorded in ancient books. In ancient times, in order to purify water, the ancients invented a purification method called "stone heating method". Li Zhou recorded that throwing hot stones into the water can kill insects and prevent epidemic. So the ancients got hot water by putting hot pebbles into water. There is also a cloud in the Essentials of Health Care: "Anyone who cooks water and drinks it will be seriously ill." But in fact, according to sociologists' research, the popular habit of drinking hot water in China was actually one hundred years ago, and this habit began in the Republic of China. 1862, a serious cholera epidemic broke out, and the daily death toll reached nearly 3000. The epidemic started in Shanghai and spread northward. However, the south at that time was not affected by this disease. There was a great difference between the north and the south at that time. Southerners prefer to drink hot water. Although this can't be proved to be the real reason why the epidemic was controlled, at that time, people's cognition was sensitive to the difference in physical fitness between the north and the south caused by hot water. Since then, the national government began to popularize this health awareness and called on people to drink hot water. In fact, looking back at the whole history, it seems that no dynasty can prove that hot water has more key health factors than cold water, just because boiling water can purify water, sterilize and avoid bacterial infection. In this case, cold boiled water can also be drunk. The only difference between it and hot water is that one is hot and the other is cold, because cold boiled water is the same as boiled and disinfected water. What are the common misunderstandings about boiling water? I once read the news that a Korean child had appendicitis and had an operation. After the operation, the doctor told him to drink more water. One day he drank 3600cc in one breath, causing acute water poisoning. Also, at the The New York Times in 2002, a girl of 16 years old died of drinking a lot of water after taking stimulants. It seems that drinking water is also risky! However, doesn't it mean that our human body is 60% water, and we should supplement a lot of water every day? How should I drink this water? Myth 1: 8 glasses of water a day 1945. The Food and Nutrition Committee of the National Research Council of the United States mentioned that in most cases, the suitable drinking water for adults is 2.5 liters per day. For different people, the general standard is 1 calorie food 1 ml, but most of the water comes from food. However, many people seem to ignore the last sentence and focus on the first sentence. Therefore, in recent years, many health experts advocate that a person should drink 8 glasses of water every day, otherwise it will not provide the water needed by the human body for one day. In fact, what we need is water, not water. Water can be obtained from fruits, vegetables, vegetable soup and other foods, not just from water. Drinking too much water may lead to diluted hyponatremia, that is, water poisoning, which is a kind of brain function damage caused by drinking too much water. Myth 2: Eat while it's hot. We often hear this saying at the dinner table. Relatives and friends get together, which reflects our enthusiasm and thoughtfulness. When the old man faces his children, this sentence becomes a sign of loving them. However, in fact, whether you eat it while it is hot or drink it while it is hot, it is a wrong eating habit. People's esophagus is not as sensitive to temperature as the mouth, so we feel that very hot food will be swallowed quickly as soon as we enter. After swallowing, I didn't feel anything at that time, but it was a little hot after swallowing, which seemed harmless to the human body, but in fact the esophageal mucosa would be burned. Of course, the esophagus in the human body will repair itself. When the burn happens, there will be nothing left, and it will be repaired automatically soon. However, in the process of "scald-repair-scald-repair" for a long time, there will be more and more atypical cells in the esophagus, which will easily lead to chronic formation and inflammation of esophageal mucosa and esophageal cancer over time. Therefore, in the carcinogen assessment report published by the International Agency for Research on Cancer (IARC) 2016, drinks above 65 degrees Celsius are classified as Class IIA carcinogens. The suitable temperature of human gastrointestinal tract is about 37.5-38 degrees Celsius, which is close to human body temperature, so water at this temperature is the most suitable. If you like to drink hot water, it is best not to exceed 50 degrees for safety. Myth 3: Drinking hot water can relieve constipation. Some time ago, a friend who had been constipated for a long time consulted on the WeChat group about how to relieve constipation. Many people say that he should drink more boiled water. In many people's minds, boiling water is everything. Girls drink more hot water during their physiological period, catch a cold and are in a bad mood. Even if you are constipated, it is recommended to drink more hot water. If drinking hot water can cure constipation, constipation may not exist. Many people know that constipation is caused by the absorption of food and water by the small intestine, which leads to dehydration and difficulty in defecation. However, drinking water during dehydration does have a certain effect, but so far no one can prove that drinking hot water can relieve constipation. If you want to replenish water, drinking cold water has the same effect. There is no need to drink hot water. There are many reasons for a person's constipation, which cannot be replaced by drinking water. But some friends around me were constipated before, and then they got up every morning to drink 400 ml warm water for a while. Before going to work, they used 200 ml of warm water to make 100 ml of honey, which lasted for a while. Of course, although there are so many misunderstandings about drinking boiled water, we have to admit that sometimes drinking boiled water is really necessary. For example, people with damaged gastric mucosa or bleeding spots should not drink cold water easily, otherwise the spasm caused by stomach cold will lead to severe pain and even gastric bleeding; For example, girls need to drink boiled water during the physiological period, and cold water will aggravate the discomfort during the physiological period and cause dysmenorrhea. However, under normal circumstances, as long as it is not the alternation of ice water and hot water that causes * * * to children's intestines and stomach, children can rest assured that drinking ice water or cold water to quench their thirst will not cause gastrointestinal discomfort. I am a working mother of two children. I like reading, writing and painting. I write with my left hand and take care of the baby with my right hand. I firmly believe that even if I live in a chicken feather, I should have my own yearning poems and distant places in my heart. Friends who like me can follow my headline number @ Keep a diary with the baby, or follow my WeChat WeChat official account: Keep a diary with the baby and discuss parenting issues together. Disclaimer: The above content comes from the Internet, and the copyright belongs to the original author. If there is any infringement of your original copyright, please let us know and we will delete the relevant content as soon as possible.