Is the omnipotent “drink more water” really omnipotent?
CCTV News: “Drink more water” is often heard in daily life, so is “drink more water” really so magical?
As we all know, people can survive for about 3 weeks without food, but only about 3 days without water. Water is the source of life, but many people’s understanding of water still stays on quenching thirst. Ca n’t wait to be thirsty before drinking water, but ca n’t desperately drink water as soon as I get sick? Drinking water is a technical task. Science and proper drinking water are necessary for everyone.
Four cases first put down the glass:
1. When catching a cold
Cold, people around me often suggest: “You need to drink plenty of water to get better”. But epidemiological experts point out that if you drink a lot of water in a short period of time during a cold, it may cause dehydration. When you catch a cold, the body will fight off the virus through a fever. This process will cause the body to lose a lot of water, and it will also take away electrolyte components such as sodium and potassium. At this time, if only a large amount of boiled water is added, the sodium and potassium in the body will be diluted by electrolyte elements. When the sodium concentration in the body drops too much, people will experience dizziness and fatigue. At this time, the brain will automatically send a signal to discharge excess water in the body through urine, sweat, etc., to meet the needs of the body’s electrolyte concentration balance. This is what is called “spontaneous dehydration” in medicine. Therefore, the body needs to add effective water when catching a cold. While drinking water, you must add enough electrolytes to help relieve cold symptoms.
Of course, people with colds should maintain enough water, drink about 300 ml of water each time, and then drink it after a period of time. This will maintain the body’s electrolyte balance and will not burden the kidneys.
2. When you are particularly thirsty
The “barbecue mode” continues throughout the country in the summer, and the high temperature and low pressure weather often tortures us to sweat and dry mouth. At this point, it is really a pleasure to drink a glass of water. But this approach is not suitable for everyone. For patients with cardiovascular and cerebrovascular diseases, drinking too much water at one time can easily increase the burden on the heart and even induce accidents.
When a person feels thirsty, the body is already in a state of mild dehydration, blood volume starts to decrease, blood viscosity increases, and heart function has been affected.
At this time, if you drink a lot of water at once, the burden on the digestive system and the circulatory system suddenly increases, and the body is too late to adapt, which may easily lead to increased blood pressure, insufficient blood supply to important organs such as the brain. as a result of. Therefore, people with poor heart function must hydrate scientifically. Don’t wait to drink water when you are thirsty. Drink water should be placed in normal times. It is appropriate to use boiled water or natural drinking water rich in minerals and trace elements to supplement the water and electrolytes needed by the body in time. At the same time pay attention to low-salt diet, try to reduce the burden on the heart. At the same time, drink water “a small amount of times”, do not drink violently at once. If you do outdoor activities, you should replenish water before, during and after the activity. 15 minutes before exercise, add 450 ~ 600 ml of water; drink about 150 ~ 240 ml of water every 15 minutes of exercise; after exercise, you should add timely and appropriate amounts. When sleeping, because the body is lying down, the amount of blood returned to the heart increases, and the burden on the heart increases. At this time, if you drink a lot of water, it will undoubtedly add to the heart’s snow, causing patients to have chest discomfort, shortness of breath and other discomforts, and even induce sudden death.
3. After exercising
According to a study in the “National Science” magazine, the brain can automatically prevent us from drinking too much water, because excessive drinking can damage our health.
Neuroscientist Pascal Sacker of the University of Melbourne in Australia and colleagues recruited 20 healthy men and women to exercise for 1 hour on a stationary bicycle. The researchers then scanned their brains using MRI and measured These people have blood flow in different areas of the brain. During the first scan, volunteers were thirsty because of long-term exercise, and drinking water was to satisfy their instincts; during the second scan, volunteers continued to drink water while being thirsty, and recorded their two The feeling of drinking water. Volunteers generally feel happier when drinking water for the first time, but feel uncomfortable when drinking water for the second time.
The brain can tell the body to drink enough water is beneficial, but drinking too much water may make the sodium ion concentration in the body too low, leading to hyponatremia, and may even cause brain edema. Therefore, when you feel uncomfortable drinking water, stop drinking it.
4. When taking medicine
Taking medicine with water can help the tablets enter the esophagus, and can also reduce the side effects of some medicines. But different types of medicines require different amounts of water, and some do not even recommend drinking water.
Ordinary capsules and tablets are usually taken with 150-200 ml of water. Drinking too much water will dilute the gastric juice and accelerate the emptying of the stomach, but it is not conducive to the absorption of drugs.
Some special medicines, in order to reduce its toxicity and avoid damage to internal organs (especially kidneys), it is recommended to drink more than 2000 ml of water every day after taking this medicine.
It should be noted that after taking certain medicines, you need to drink less or even not for a short time. For example: drugs that protect the gastric mucosa (aluminum hydroxide gel, sucralfate, colloidal bismuth, etc.) should not drink water within half an hour before or after taking, otherwise it will affect the efficacy. Cough medicine compound licorice mixture, cough syrup, Chuanbei cough syrup, etc., should not drink water immediately after taking.
Three major elements of scientific drinking water
Since drinking too much water can sometimes cause illness, do we really have to put down the glass and give up drinking more water? In fact, if you want water to “work” for the human body, you must master three major elements.
1. Water consumption
In our daily water intake of 2500ml, we must ensure that there is 1600ml of boiled water, and the remaining water can be properly obtained from other foods.
The correct way is to drink water diligently, two or three sips at a time, do not wait until you are thirsty before drinking. In addition, we must focus on three drinking periods each day: a glass of water (about 200 ~ 300 ml) to get up early; a glass of water one hour before bedtime; and a glass of water before meals.
2. Water temperature
Drinking cold water will make the gastrointestinal mucosa suddenly cold, so that the original open capillaries contract, causing gastrointestinal discomfort and even diarrhea. The hot water enters the esophagus, which can easily damage the esophageal mucosa and induce esophageal cancer. Therefore, the temperature of drinking water can not be too hot or too cold, the most suitable temperature is 10 ℃ ~ 30 ℃.
When drinking water, some people are used to “beverage”, but this drinking method is not good for health. Drinking a lot of water quickly will quickly dilute the blood and increase the burden on the heart. It is also easy to swallow a lot of air together, which can easily cause hiccups or bloating. The correct way to drink water is to put a mouthful of water in your mouth and swallow it slowly in several times, so that you can fully moisturize your mouth and throat and effectively relieve thirst. (Contributed by Beijing Shijitan Hospital)