The first and one of the most important is the lack of sun. A significant and very long reduction in daylight hours in winter, when the dark time of day only increases for months, leads to two consequences. Firstly, it has a depressing effect on the psyche, which finds it difficult to function normally in constant twilight.
Secondly, under the influence of sunlight, more precisely, the ultraviolet part of its spectrum, vitamin D3 (cholecalciferol) is produced in our skin. The less […]