Mushrooms are low in calories, fat-free, cholesterol-free, gluten-free, and very low in sodium, yet they provide important nutrients, including selenium, potassium, riboflavin, niacin, vitamin D, dietary fiber and more. Often categorized with vegetables, mushrooms provide many nutritional attributes of produce, as well as attributes more commonly found in meat, beans or grains.
Everyone is discovering the benefits of fresh mushrooms. Mushrooms are nutritious; they contain heart-healthy potassium, essential B-vitamins as well as Selenium- a powerful antioxidant.
More research and references can be found here.