Mushroom soup cannot be drunk overnight. If the leftover soup is left in aluminum pot and iron pot for a long time, it will precipitate substances harmful to human body. The best way to preserve soup is not to put salt and other spices in the soup; Drink soup with a clean spoon that day; If you can't finish it, it's best to store it in the refrigerator with glassware, ceramics, fresh-keeping boxes, etc., and it's best not to put it in aluminum pot or stainless steel pot. Mushroom soup has a high content of protein. The protein content of fresh or aquatic edible fungi is 1% ~ 3.5%, which is slightly higher than that of ordinary vegetables. For example, the protein content of auricularia auricula is 1.5%, and the protein content of fresh mushrooms is 2.2%. The proportion of dried edible fungi in protein increased greatly due to the decrease of water content, and its protein content was mostly 10% to 30%. And its proportion is close to the essential amino acids of human body, with good utilization rate and high nutritional value.