1, silver ear soup overnight is not able to eat, because once the silver ear soup overnight, its nutrients will be reduced and produce harmful substances.

2, the silver fungus contains more nitrates, boiled if the time is longer, in the bacterial decomposition, nitrates will be reduced to nitrites. When people drink this soup, nitrite will naturally enter the blood circulation, blood red blood cells inside the hemoglobin, it can carry a lot of oxygen for the body needs. But nitrite into the body will play a counterproductive role, so that the body's normal hemoglobin oxidation into methemoglobin, the loss of the ability to carry oxygen, resulting in a lack of normal human hematopoietic function. Thus, silver ear soup overnight is not edible.