One of the secrets was revealed by nutritionist and medical science candidate Natalia Denisova. It is related to the most relevant vitamin today, vitamin D. In recent years, it has been established that it is both a hormone and that we need significantly more of it than previously thought. “Mushrooms are the only plant organism capable of producing vitamin D,” says Natalia Denisova. “Just like in our skin, under the influence of ultraviolet light, ergosterol in mushrooms is converted into vitamin D2 (ergocalciferol). Scientists from the University of Florida found that 15 minutes of exposure of fresh champignons to a UV lamp increases the vitamin D2 content in a serving (100 g) from zero to over 100% of the daily requirement (up to 1000 IU and higher). Further studies showed that the bioavailability of D2 from irradiated mushrooms is equivalent to synthetic supplements and effectively raises its level in serum. For residents of northern countries and people avoiding the sun, this is a simple and natural way to prevent deficiency. It is enough to place any cultivated mushrooms under direct sunlight with the gills (lamellae) facing up for 15–30 minutes before cooking.” Shall we try?