Yes, they are! Eating mushrooms provides your body with antioxidants thanks to the mineral, selenium found in them.  There is no other vegetable that will provide your body the same amount of selenium.  Mushrooms also contain the B vitamins, riboflavin, niacin and pantothenic acid which benefits and supports a healthy digestive system and healthy skin. Lastly, mushrooms are rich in potassium and eating ⅔ a cup of cooked portobellos, provides more potassium than a medium banana.