Cold boiled water is the safest and most thirst-quenching water. It's best to burn it now and drink cold water. Because the bacteria in cold boiled water exceeded the standard overnight, it is better not to drink it as much as possible. Some doctors suggest that cold cooking should not exceed 24 hours overnight. Once this time limit is exceeded, it will be harmful to the health.

1, cold frost will produce bacteria overnight.

Although cold boiled water is economical and practical, it is also safe to quench thirst, but cold boiled water also has a shelf life. Once three hours have passed, the bacteria in the cold water will increase, which is harmful to our health. Therefore, it is best to burn it now and drink cold water. It's convenient to make a quick pot. You can boil water in a few minutes. Don't be afraid of trouble. Too much boiling water at a time is not good for your health.

2. Cold boiled water overnight will produce excessive nitrite.

Leaving cold boiled water for too long will produce a lot of bacteria and nitrite. Once nitrite enters our body, it will cause us dizziness, nausea and vomiting. We know that nitrite can be converted into ammonium nitrite, which can promote gastric cancer and liver cancer. In the past, we had many bad habits. We once boiled a large pot of water on the stove and then kept it warm in a thermos. If you drink it, throw it out. If you don't drink it, put it in a thermos. This bad habit is unscientific and needs to be corrected, otherwise it will harm our health for a long time.

Many old people are stubborn and feel that they have been like this all their lives. Drinking overnight water is nothing, just a temporary change. Current environmental pollution, air pollution, water pollution, etc. It poses a great threat to our health. Therefore, for the sake of health, we should keep healthy scientifically and eat reasonably. Don't drink cold boiled water overnight, be responsible for your health.