I googled "mushroom nutrition facts."
They are: low in Saturated Fat and Sodium, and very low in Cholesterol. It is also a good source of Dietary Fiber, Protein, Vitamin C, Folate, Iron, Zinc and Manganese, and a very good source of Vitamin D, Thiamin, Riboflavin, Niacin, Vitamin B6, Pantothenic Acid, Phosphorus, Potassium, Copper and Selenium.
Check the link if you like. nutritiondata.self.com/facts/vegetables-an