The role of folic acid and vitamin B12 in gestational diabetes mellitus and offspring development: A narrative review.

Gestational diabetes mellitus (GDM) is a prevalent complication, affecting approximately 14% of pregnancies worldwide, and is associated with an elevated risk of both maternal and infant complications. It also exerts long-term adverse effects on offspring health, including metabolic, cardiovascular, and neurodevelopmental disorders, thereby compromising maternal and infant well-being. During pregnancy, an imbalance between folic acid and vitamin B12 has been linked to an increased risk of GDM and unfavorable metabolic outcomes in offspring, underscoring the potential clinical value of maintaining their balance and implementing early interventions. This review summarizes the role of folic acid and vitamin B12 in gestational diabetes and offspring development, aiming to bridge the gap between mechanistic insights and clinical evidence. It highlights the potential for reverse causality in linking vitamin B12-folic acid imbalance to GDM risk and underscores the need to integrate novel metabolic and epigenetic concepts into future intervention trials.