Mushrooms are delicate vegetables both in taste and temperament. If you forget to cook them right away, the mushrooms can go from beautiful to a sludgy
The key to longer-lasting fresh mushrooms is in how you store them after you bring them home from the grocery store
Proper storage and handling are what prevent mushrooms from going bad before you have a chance to eat them.
According to a study published by the National Library of Medicine (NLM), fresh mushrooms are very perishable
They lose their moisture, the color and texture change, and their nutritional value and flavor go down within a week.
Mushrooms have a high water content, about 90 percent, according to Harold McGee in On Food and Cooking: The Science and Lore of the Kitchen.