Button Mushrooms

Button Mushrooms
Don't dismiss the lowly mushroom as nutrient poor: It has the mineral selenium and antioxidants. Low levels of selenium have been linked to increased risk of developing more severe flu. And the B vitamins riboflavin and niacin, found in these mushrooms, play a role in a healthy immune system. Animal studies have also shown mushrooms to have antiviral, antibacterial, and anti-tumor effects.

for more info see-
http://www.webmd.com/cold-and-flu/slideshow-immune-foods?ecd=wnl_wmh_050911