Can the water be boiled again?

Boiled water doesn't need to be boiled for a second time, just heat it a little. From a health point of view, you can continue drinking water after boiling it twice. However, it is best not to cook it repeatedly. After cooking once, you can drink it by heating it before drinking it next time. Although water can be boiled twice, it is not recommended to cook it repeatedly overnight. Overnight boiling water will have a certain concentration of nitrite, which is harmful to human body.

Nitrite, an inorganic compound. Mainly refers to sodium nitrite, which is white to yellowish powder or granular, slightly salty and easily soluble in water.

Nitrate and nitrite exist widely in human environment and are the most common nitrogen-containing compounds in nature. Nitrate in human body can be reduced to nitrite and precursors of N- nitroso compounds under the action of microorganisms.

Similar in appearance and taste to salt, it is widely used in industry and architecture, and it is also allowed to be used as a color developer in meat products in limited quantities. The probability of nitrite causing food poisoning is very high. Eating 0.3 ~ 0.5g of nitrite can cause poisoning, and 3g can cause death. 2065438+0717127 October, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization was preliminarily sorted out for reference. Nitrate or nitrite ingested under endogenous nitrosation is in the list of Class 2A carcinogens.