With daylight getting shorter and darkness coming earlier, your exposure to sunlight and the ability to make bone-strengthening vitamin D in the body during the fall is shortened. Mushrooms are one of the very few foods that contain ergosterol, a compound that, when exposed to the ultraviolet (UV) rays of the sun during the growing process, can be converted to small amounts of vitamin D. Research has uncovered that this conversion can be increased by exposing the mushrooms to additional UV light during processing. When portobello mushrooms were exposed to an additional 10 to 15 seconds of UV light, their vitamin D content increased from a mere 17 International Units (IU) to 634 IU per cup. Look for mushrooms in the supermarket with a sticker on the label that tells you that they have been treated to increase their vitamin D content. Since most adults should be consuming 600 IU daily of vitamin D, a Stuffed Portobello Mushroom can be a vitamin D-rich way to enjoy a meatless meal.
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