Early pregnancy vitamin D deficiency and gestational diabetes: Exploring the link.

Background And Objectives: Diabetes, including gestational diabetes mellitus (GDM), and vitamin D deficiency or insufficiency (VDDI) are recognised public health problems. There is conflicting evidence regarding the relationship between vitamin D deficiency and GDM. The aim of this study was to explore the incidence of VDDI among pregnant women attending a maternity unit in Sydney, Australia, and the relationship between VDDI in early pregnancy and later development of GDM.