[Pharmacological prevention disease with vitamin D--epidemiological evidence using the example of complications...

National and international epidemiological studies have shown that relevant segments of populations are - especially in the winter period - vitamin D deficient and for the entire year vitamin D intake is far too low. This also applies to pregnant women. In January 2012 the German Nutrition Society has increased the intake recommendations for vitamin D by a factor of 4. It is suggested that a sufficient supply with vitamin D has high preventive potentials with respect to several chronic diseases and will potentially reduce the incidence of preterm birth. This paper considers the evidence of associations between vitamin D deficiency and adverse pregnancy outcomes. Based on the current epidemiological knowledge which is, however, sparse there is very low evidence that vitamin D deficiency is a relevant risk factor for adverse pregnancy outcomes. This makes it even more difficult to give rationale answers to emerging questions with respect to supplementation, dosage and vitamin D diagnostic measures. An observational study with 2 or 3 large obstetric clinics should be undertaken to clarify the central question without delay.