Get ready for this list: Mushrooms are low in calories, fat-free, cholesterol-free, gluten-free, with barely any sodium, and yet they carry a wealth of selenium, potassium, riboflavin, niacin and vitamin D. Mushrooms are also hearty and filling so they can help you control your weight without compromising taste. And they're a rich source of umami, the fifth basic taste after sweet, salty, bitter and sour. They can help simple dishes come alive.