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When it comes to mushrooms, your choices are many: White button, Portobello, shiitake, and Maitake are just a few of the varieties you'll find in your grocery store. Fortunately, just about all mushrooms contain some form of immune-boosting antioxidants, along with potassium, B vitamins, and fiber.

Shiitakes, for example, contain lentinan, a nutrient that is thought to have anticancer properties. Other varieties, such as certain brands of Portobello, are grown in ultraviolet light to spur vitamin D production.

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