Depending on the variability, mushrooms are rich in vitamins and minerals, like vitamin D, potassium, selenium, and copper, says culinary and integrative dietitian Marisa Moore, MBA, RDN, L.D. They're high in fiber, which may also help assist digestion and coronary heart health1, registered dietitian Brenna Wallace, M.S., RDN, LDN, says. Furthermore, analysi...