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Gestational Diabetes Research and Management · Journal article
Endocrinology Diabetes & Metabolism · August 13, 2026
Encouraging direction, but not yet definitive.
This secondary analysis of an RCT in 962 overweight or obese pregnant women found that maternal vitamin D deficiency (<30 nmol/L) before 20 weeks' gestation was significantly associated with greater increases in LDL cholesterol throughout pregnancy and elevated β-hydroxybutyrate at 24–28 weeks, with higher cord blood ketone levels in offspring. Although the associations are statistically significant in adjusted analysis, the clinical relevance of these metabolic marker changes and whether they reflect causal relationships remain undefined.
Secondary analysis of multicenter, randomized controlled trial. Pregnant women aged ≥18 years with BMI ≥29 kg/m², singleton pregnancy, <20 weeks' gestation; those with gestational diabetes mellitus before 20 weeks were excluded.. Intervention: Vitamin D sufficiency status (>50 nmol/L) at baseline.. Compared with: Vitamin D deficiency (<30 nmol/L) and insufficiency (30–50 nmol/L) at baseline.. n = 962. Not stated in abstract..
Women with vitamin D deficiency had significantly larger increases in LDL-C throughout pregnancy compared to vitamin D sufficient women in adjusted analysis Vitamin D deficiency was associated with elevated β-OH-butyrate at 24–28 weeks' gestation in maternal blood Cord blood β-OH-butyrate was significantly higher in offspring of mothers with vitamin D deficiency
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Clinicians should note that early maternal vitamin D deficiency may be associated with metabolic dysregulation in pregnancy and altered fetal metabolic markers, but the clinical significance of these findings—including whether intervention would improve outcomes—remains unknown. The results suggest vitamin D status warrants consideration in metabolic risk stratification during pregnancy, though confirmatory and outcome-focused research is needed before practice changes.
Secondary analysis of a randomized controlled trial showing significant associations between maternal vitamin D deficiency and altered lipid and ketone metabolism in pregnancy and cord blood, but mechanism remains unclear and clinical outcomes not reported.
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Quoted from the source exactly as published.
Clinicians should note that early maternal vitamin D deficiency may be associated with metabolic dysregulation in pregnancy and altered fetal metabolic markers, but the clinical significance of these findings—including whether intervention would improve outcomes—remains unknown. The results suggest vitamin D status warrants consideration in metabolic risk stratification during pregnancy, though confirmatory and outcome-focused research is needed before practice changes.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
ABSTRACT Introduction Vitamin D (vitD) plays a role in metabolic regulation, including lipid metabolism and insulin sensitivity. During pregnancy, profound physiological changes in lipid handling and ketogenesis occur to support fetal development. However, the extent to which maternal vitamin D status influences these metabolic adaptations and fetal metabolic markers remains unclear. Methods In this secondary analysis, we examined lipid distribution throughout pregnancy—from before 20 weeks' gestation to delivery—in women with overweight or obesity, stratified by vitamin D status (deficiency, insufficiency, or sufficiency), assessing both maternal and cord blood. Main inclusion criteria were: age > =18 years, singleton pregnancy, < 20 weeks' gestation, BMI ≥ 29 kg/m 2. Women with GDM < 20 weeks' gestation were excluded. In total, 962 pregnant women were divided into vitD deficient (< 30 nmol/L, n = 102), insufficient (30–50 nmol/L, n = 222) and sufficient (> 50 nmol/L, n = 638) groups. VitD levels and lipid concentrations were assessed at < 20, 24–28 and 35–37 weeks' gestation and in cord blood. Results Compared with vitD sufficient women, women with vitD deficiency had significantly larger increases in LDL‐C throughout pregnancy and ß‐OH‐butyrate at 24–28 weeks' gestation, in adjusted analysis. VitD in cord blood was highest in offspring of mothers with vitD sufficiency. In cord blood, significantly higher ß‐OH‐butyrate was observed with vitD deficiency; lipid concentrations were similar between groups. Conclusions Early vitamin D deficiency before 20 weeks of gestation was associated with altered metabolic trajectories during pregnancy, including greater increases in LDL cholesterol and ketone body concentrations in women with overweight or obesity, as well as higher cord blood ketone levels in their offspring. These findings suggest that early maternal vitamin D status may influence maternal and fetal metabolic adaptations, although causal relationships and clinical implications require further investigation. Trial Registration Trial registered at ISRCTN registry ( https://doi.org/10.1186/ISRCTN70595832 ) trial number ISRCTN70595832. Registration date 02/12/2011
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