Yes you can eat shiitake mushrooms daily and there are a lot of health benefits attributed to including them as part of your diet. Shiitake mushrooms can reduce inflammation and strengthen the immune system, preventing us from getting colds and flu. This East Asian fungus can also improve sleep quality because of its high dose of vitamin D (a deficiency of vitamin D can cause insomnia). Also, other health benefits such as slowing the growth of tumors, improving heart health, and fighting obesity, are also linked to the consumption of shiitake mushrooms.