It is a common phenomenon to drink hot and cold alternate water on the water dispenser. Some people start to collect water before it boils. Or after the boiling water is connected, if you don't want to wait, you can connect some hot and cold water. There are also some people who first receive a little boiled water, then add a little cold water, so that they can drink it immediately. Although water will increase the chances of bacteria reproduction in the alternation of cold and hot water, there is no scientific conclusion on how harmful it is to drink cold and hot water together.
The quality of bottled water is the most important factor to check whether the hot and cold alternative water is harmful to the body. If the quality of bottled water is guaranteed, there is no big problem in drinking the water-cooled hot water on the water dispenser. If the quality of bottled water is not up to standard, or the tap water is filtered directly by the filter barrel on the water dispenser, then the cold and hot water can be drunk alternately, which may cause harm to the body. Because in this case, cold water is' raw water 'with a lot of bacteria.
What kind of water is good for your health
(1) is it better to drink hard water or soft water?
To know whether it's better to drink hard water or soft water, first understand the relationship between calcium and magnesium ions and human health. Calcium and magnesium ions are necessary nutrients for human body every day. If water has certain hardness, a certain amount of calcium and magnesium ions can be supplemented by drinking water. If you take soft water for a long time, you need to supplement it through other ways.
But the hardness of water is neither too high nor too low, because the hardness of water is closely related to some diseases. In areas with high water hardness, the incidence of cardiovascular disease is low, but the incidence of kidney stones increases with the increase of water hardness. The south of China is mostly soft water, while the north is mostly hard water. The standard of drinking water in China is no more than 25 degrees. The most suitable hardness of drinking water is 8-18 degrees, which belongs to mild or moderate hard water.
The hardness of water is also related to the taste. The hard water is refreshing. Most mineral water has a high hardness, which makes people feel fresh and delicious. The soft water is insipid. But make tea with hard water, make coffee, the taste will be affected. Some food processing water is more exquisite, the hardness of water will affect food processing, easily cause protein precipitation, inorganic salt precipitation or more difficult to cook, while soft water is better for beverage water. Boiler water should soften the hard water, otherwise it will cause accidents due to too much scale.
(2) is it better to drink pure water or tap water?
At present, experts disagree on whether to drink pure water or tap water. Some experts believe that drinking water is to supplement water, there is no need to consider nutrition. Other experts believe that tap water contains many trace elements and inorganic salts, which are good for human body.
So, what nutrition is there in tap water? The content of zinc and iron in 1000 ml water is less than 0.2 mg. Adults need to supplement 10 MG-15 mg of zinc and 12 mg-18 mg of iron every day. The daily intake of trace elements from water is less than 1 mg, which is insignificant compared with the trace elements needed by human body. However, the water contains high calcium and magnesium elements, which is good for human body.
The real pure water, after multi-layer filtration, generally removes impurities, trace elements, inorganic salts and pathogenic bacteria in the water. It is safe, non-toxic, pollution-free, hygienic and beneficial to human body, and the missing elements can be taken from food. Therefore, if economic conditions permit, the purchase of real pure water is the progress of human beings. But at present, the production of purified water is not standardized. If you buy unqualified products, it is harmful to your health.