You cannot drink soup that has been left overnight because the leftover soup is stored in aluminum or stainless steel pots for a long time and is prone to chemical reactions. It should be placed in glass or ceramic vessels. The best way to preserve it is not to add seasonings such as salt to the soup base. After cooking the soup, use a clean spoon to scoop out what you want to drink that day. If you can't finish it, it is best to use an earthen pot and store it in the refrigerator.

Foods that should not be eaten overnight include fish, seafood, green leafy vegetables, cold dishes, etc. You cannot drink tea that has been left overnight. Because most of the vitamins have been lost over time, and the proteins, sugars, etc. in the tea soup will become nutrients for the reproduction of bacteria and mold. Therefore, people usually think that you cannot drink tea that has been left overnight.

Extended information:

1. Do not drink Tremella fuciformis soup overnight

Tremella fuciformis soup is an advanced nutritional supplement, but if it stays overnight, the nutrients will be reduced and lost. produce harmful ingredients. Because both the Tremella fuciformis cultivated indoors and the Tremella fuciformis cultivated outdoors contain more nitrates, if they are left for a long time after being cooked, the nitrates will be reduced to nitrites under the decomposition of bacteria.

When people drink this soup, nitrite naturally enters the blood circulation. The red blood cells in the blood contain hemoglobin, which can carry a large amount of oxygen for the body's needs. However, nitrous acid has the opposite effect, causing normal hemoglobin in the human body to oxidize into methemoglobin, losing the ability to carry oxygen, causing the human body to lack normal hematopoietic function!

2. Do not eat overnight vegetable soup

Green vegetables contain a large amount of nitrates obtained from the soil and irrigation water where they are grown. If fresh vegetables or cooked vegetables are left for too long, under the decomposition of bacteria, the nitrates they contain will be reduced to nitrates. Nitrates.

When people drink this vegetable soup, the nitrite in the soup will enter the gastrointestinal tract and enter the bloodstream through absorption. The red blood cells in normal blood contain a substance called hemoglobin, which can carry a large amount of oxygen to meet the needs of the body.

However, nitrite can oxidize the divalent iron in normal hemoglobin into trivalent iron, causing methemoglobinemia in the human body, causing the red blood cells to lose the ability to carry oxygen, and the human body will suffer from a deficiency. Oxygen symptoms can lead to death in severe cases.

In addition, because nitrite is also a strong carcinogenic chemical, drinking this kind of vegetable soup for a long time or even overnight may increase the risk of gastric cancer and rectal cancer.

Reference materials:

People's Daily Online - Is overnight soup good for your health? Inventory of 8 deadly overnight foods

People's Daily Online - Which overnight dishes should not be eaten, eating the wrong ones can cause cancer

Baidu Encyclopedia - Overnight soup