Increase your vitamin D
Mushrooms are the only fruit or vegetable source of this critical vitamin. Mushrooms produce vitamin D when in sunlight so they are often called the sunshine vitamin. Adults under 50 are recommended to get 400 to 1,000 IU daily.
Boost your immune system
A study done on mice and published by the American Society for Nutrition found that white button mushrooms may promote immune function by increasing the production of antiviral and other proteins that are released by cells while they are trying to protect and repair the body’s tissues. A later study showed that these mushrooms promoted the maturation of immune system cells — called dendritic cells — from bone marrow. According to the researchers, these mushroom benefits may help enhance the body’s immunity leading to better defense systems against invading microbes. 
Full of Antioxidants
When it comes to antioxidants — the substances that help fight free radicals that are the result of oxidation in our body — we’re more likely to think of colourful vegetables than neutral-hued mushrooms. But a study at Penn State university showed that the oxygen radical absorbance capacity (ORAC) — a measure of a food’s total antioxidants — of crimini and portobello mushrooms were about the same as for red peppers.
B vitamins are vital for turning food (carbohydrates) into fuel (glucose), which the body burns to produce energy. They also help the body metabolize fats and protein. Mushrooms contain loads of vitamin B2 (riboflavin) and vitamin B3 (niacin).
Mushrooms are a flavorful superfood that benefits virtually every diet and cuisine
Mushrooms provide many of the same nutritional benefits as vegetables, as well as attributes commonly found in meat, beans, and grains. Learn more about mushrooms and why they are 2020s #1 Trending Item in the Produce Aisle. Mushrooms are referred to as the Sunshine Vitamin because they are the only natural source of Vitamin D in the produce aisle.
Rich in selenium, a mineral that helps the immune system function properly.
Mushrooms contain B Vitamins
Mushrooms are rich in B vitamins which help to provide energy by breaking down proteins, fats, and carbohydrates. Vitamins also play an important role in the nervous system.
With a similar texture to meat, mushrooms are not only hearty, filling and satisfying, but they are a low-calorie, fat-free and cholesterol-free food, making them a great choice for those looking to manage their weight. Preliminary research suggest the increasing intake of low-calorie high-volume foods, specifically mushrooms, in place of high-calorie, low-volume foods, like ground beef, can be effective for reducing daily calorie and fat intake while still feeling full and satiated.
Benefits of Mushrooms
Mushrooms contain B Vitamins, Riboflavin, Niacin Panthothenic acid, Selenium, Ergothioneine, Copper, Potassium, and Complex carbohydrates - including fiber.
 https://www.besthealthmag.ca/best-eats/nutrition/health-benefits-mushrooms/. Feb 2019