A new University of Florida at Gainesville study shows improved immune function in people who ate a large-cooked shiitake mushroom every day for four weeks.

Trillions of microorganisms inhabit us -- inside and out with recent estimates reaching four pounds of biomass or roughly over 200 trillion microorganisms. They reside on our skin and in our mouth, by our eyelids, in our stomach and intestines, in the vagina, and in the milk ducts of the breasts. They have even been discovered comfortably residing in our respiratory tract. Scientists are surveying these microbial cities to learn more about their role in health.