Tremella is a traditional tonic. It has high medicinal value and is rich in vitamin D, which can prevent the loss of calcium and is very beneficial to growth and development. At the same time, it can also enhance the body's anti-tumor immunity.

However, tremella is delicious, but it is also dangerous. There is a situation that will turn tremella into "poison", that is, eating tremella soup (soup) overnight. Because tremella contains more nitrate, if cooked tremella is left for a long time, nitrate will be reduced to nitrite under the decomposition of bacteria. After people eat tremella decoction containing more nitrite, hemoglobin in blood will lose its oxygen-carrying ability, thus destroying the normal hematopoietic function of human body, and even causing vomiting, coma and even death in severe cases. When making tremella soup at home, it should be eaten fresh. Therefore, it is best not to eat tremella at night.

In addition, tremella should not be eaten more, generally 15g is enough for one person once; Also, rock sugar tremella has a high sugar content, so don't eat it before going to bed, so as not to increase blood viscosity; Tremella can clear lung heat, so it is not suitable for patients with exogenous wind and cold.

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So the boiling water should not be cooked yet, so it is no problem to spend the night. And "if it is left for a long time", if it is put before going to bed in the morning, 8- 10 hour should not be too long.