Abstract:

In recent years increasing information has been published regarding the pleiotropic effects of vitamin D that has long been regarded as a factor playing a role in calcium level regulation and the skeletal system only. The way of life characteristic of present population, with most of the time spent indoors, creates conditions favoring long-term vitamin D deficit, starting in the years compulsory school attendance already. The main source of vitamin D for the human body is solar radiation. This accounts for 80% of the active vitamin supply, while nutrition provides only the remaining 20%, and according to some sources this ratio is even 90% to 10%. This is the reason for the inconsistency of the results of studies based on the evaluation of vitamin D intake in nutrition.

Keywords: vitamin D, solar radiation, calcium level regulation