80-90 % of the population are currently under-supplied with vitamin D, especially in winter.
Since we now spend most of the time in closed rooms, our body produces significantly less vitamin D than before - with serious consequences for the health of those affected.
A study with 11- to 13-year-old Viennese schoolchildren shows that even at the end of summer only 10 % of children have a normal vitamin D level> 30 ng/ml. In the following winter months, this proportion drops to below 1 %.
We are currently unable to estimate what this fact means for the health of the population in the long run, since there was no such thing in the past.