Gestational diabetes & diabetes in pregnancy

Perinatal and postpartum insulin secretion capacity in women with early-onset and late-onset gestational diabetes

BMJ Open Diabetes Res CarePublished Retrospective cohort study

Authors' conclusion

EGDM in women without obesity is associated with a high risk for postpartum glucose intolerance. This could be related to impaired insulin secretion rather than insulin resistance. These findings highlight the need for close monitoring and tailored interventions for patients with EGDM. More research is required to improve diagnostic and management strategies, considering ethnic variations in insulin secretion and glucose tolerance.

Study context

Population
Women with gestational diabetes mellitus (GDM) diagnosed by 75 g OGTT, Japan
Participants
107 vs 109
Exposure
Early-onset GDM vs late-onset GDM
  • EGDMn = 107
  • Late GDM (LGDM)n = 109reference
Outcome
Postpartum glucose intolerance
Follow-up
4-16 weeks post partum
Methodological detailssingle-centre
  • Single-centre

Main finding

As reported in the abstract

  • Postpartum glucose intolerance was more prevalent with EGDM, particularly in those without obesity

Observational data: associations, not effects.

Further findings

Insulin secretion and resistance

Significantly lower initial insulin secretion capacity in EGDM without obesity
Insulin resistance was comparable between the groups
  • Subgroup: women without obesity

Pregnancy outcomes

Gestational weight gain significantly lower with EGDM than LGDM
Neonatal birth weight, small and large for gestational age comparable between groups

Original publication

Perinatal and postpartum insulin secretion capacity in women with early-onset and late-onset gestational diabetes. BMJ Open Diabetes Res Care. Published 5 October 2025. doi:10.1136/bmjdrc-2025-005114

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