Boiled water is indispensable in our daily life, so there are requirements for drinking boiled water. Generally, the boiled water that has passed the night or has been placed for a long time cannot be drunk, because there will be bacteria breeding in it. Can the boiled water be drunk? What's the harm of boiling water? Let's get to know.
How long after boiling water can not be drunk
Generally, it is not recommended to drink it in 24 hours. The boiled water itself contains nitrite. For the sake of health, don't drink it after a while.
1. Nitrite can form carcinogenic nitrosamines in human body. Some experts found that the content of nitrite in boiled water was higher than that in raw water. Moreover, the content of nitrite in boiled water which has been boiled repeatedly for a long time or more than 24 hours is obviously increased. After 24 hours of boiling water, the content of nitrite was 1.3 times of that when it was just boiled. It's better to drink the boiled water of the day. Do not drink boiled water that has been boiling for too long, boil and boil for 3 minutes, which can evaporate the chlorine and some harmful substances in the water, and at the same time keep the nutrients necessary for human body in the water.
2. To drink fresh boiled water, do not drink water placed for too long. Fresh boiled water is not only sterile, but also contains more than ten kinds of minerals needed by human body. However, if the time is too long or the water in the automatic water heater is boiled overnight, not only there are no minerals, but also some harmful substances, such as nitrite, may be contained.
3. After 24 hours of boiling water, the content of nitrite was 1.3 times as high as that when it was just boiled. The residents of our country have the habit of drinking boiled water. It is better to drink it now or only the boiled water of the day. Do not drink boiled water that has been boiling for too long.
What's the harm of heating boiled water repeatedly
In fact, it is harmful. Water is heated on the surface. In fact, some nitrite in the first heating water exists. Harmful substances exist all the time. Reheating will still be toxic.
1. Drinking pure water, distilled water and deionized water, basically free of impurities. No matter how you burn it, water or water will not become other substances. But drinking water may contain trace amounts of harmful substances. Some of these harmful substances are volatile, and burning them repeatedly will help to remove them.
2. However, some harmful substances, such as heavy metals and nitrates, do not volatilize. The third reason why the repeatedly boiled water can't be drunk is that after the water is repeatedly boiled, the water evaporates and the nonvolatile harmful substances are left behind, so that the concentration of harmful substances increases, which is harmful to human body.
3. The water in the water dispenser is usually heated to 85 ℃. The water in the water dispenser is recycled (you pour out hot water and then inject cold water to reduce the total temperature). There are some old water in the water. Distributor. This' old water 'is hidden in pathogens, which can lead to digestion and secretion. Urine and other diseases.
4. Re boiled water: some people are used to re boil and re drink the remaining warm water in the hot water bottle, so as to save water, coal (gas) and time. But this "saving" is not enough. Because the water is burned and burned again, the water will evaporate again, and the nitrite will rise. Drink this kind of water often, and the nitrite will accumulate in the body, causing poisoning.
Benefits of hot water in summer
1. Relieving summer heat
Drinking cold water can only reduce the body temperature for a short time, but also because pore contraction is not conducive to heat dissipation. Drinking hot water can raise body temperature, open pores, discharge sweat, directly expel body heat through perspiration, and play a role in relieving summer heat.
2. Detoxification
Drinking hot water in summer can accelerate blood circulation, promote water metabolism, and accelerate the discharge of toxins in the body. And it can also play a role in detoxification by drinking hot water to perspire.
3. Protecting stomach
Excessive and excessive disposable drinking water will greatly expand the capacity of the stomach, which is far beyond the capacity of gastrointestinal transmission and absorption, increase organ load and affect the digestive function. In particular, it is more harmful to carry out intense activities again after the cattle drink (fast and large amount of drinking).
4. Beauty and skin care
Skin care can't do without water. Drink more water to moisturize your skin. It's best to drink about 4-5 times a day. Don't wait until you are thirsty. If your skin is short of water, it will appear dry and peeling. Boiled water can warm internal organs, promote digestion, let toxins stored in the body out of the body, make the skin more white and tender.
5. Moisten intestines and relieve constipation
After getting up in the morning, the gastrointestinal tract has been emptied. At this time, drinking water can wash and clean the gastrointestinal tract, dilute the gastric acid, reduce the stimulation of the stomach, and keep the gastrointestinal tract in the best condition. Drinking more boiled water can stimulate gastrointestinal peristalsis, moisten intestines, soften stools, promote the excretion of stools, and prevent constipation.