Five kinds of food that should never be eaten overnight

Fried dishes contain oil and salt. After one night, the vitamins in the dishes are oxidized, causing the nitrite content to increase significantly. After entering the stomach, it turns into nitrite. Although nitrate is not a direct carcinogen, it is a major health hazard. After nitrite enters the stomach, under certain conditions it will generate a substance called NC (N-nitroso compound), which is one of the risk factors for gastric cancer.
1. Do not drink overnight boiled water

Boil tap water for 3 to 5 minutes. The content of harmful substances such as nitrite and chloride is the lowest, making it most suitable for drinking. Nitrite can form carcinogenic nitrosamines in the human body. Some experts have found that the nitrite content in boiled water is higher than that in raw water. Moreover, the nitrite content increases significantly if the water is boiled repeatedly for too long or for more than 24 hours. After boiling water has been left for 24 hours, the nitrite content is 1.3 times that of when it was just boiled. Residents of our country have the habit of drinking boiled water. It is best to drink it immediately after it is boiled or only drink boiled water of the same day. Also, do not drink water that has been boiled for too long.

Braised food must be eaten on the same day and not left overnight. From a food safety perspective, this is unhygienic. Food experts remind that even if it is placed in the refrigerator, it is not absolutely "safe". Mold and psychrophilic bacteria are also easy to grow in the refrigerator.