Many Russians face vitamin D deficiency, especially those living in the north and northwest of the country. It is synthesized in our skin under the influence of ultraviolet rays. In theory, everything sounds pretty good: scientists say that it is enough to spend at least 15-30 minutes a day on the street to get enough of this vitamin.
However, in practice there are several nuances. Firstly, in some regions the sun is a rare visitor. Secondly, vitamin synthesis can be slowed down due to polluted air in big cities. Thirdly, doctors do not advise overdoing it with sunbathing: UV rays, alas, increase the risk of skin cancer and accelerate the aging process.
However, vitamin D is also found in food.