Mushrooms contain macronutrients that support a healthy immune system. According to the Mushroom Council, your immune system will benefit from mushrooms whose nutrients include: Selenium, which helps your body make antioxidant enzymes to prevent cell damage.
Fungi have the ability to transform nutrients in a way that makes them available for plants. Some fungi are decomposers which mean that they break down plant and animal debris, thus cycling nutrient and increasing their availability in the soil.