Gestational diabetes & diabetes in pregnancy

Association between polycystic ovary syndrome and pregnancy outcomes in gestational diabetes mellitus (GDM): A secondary analysis of the DiGest trial

J Clin Endocrinol MetabPublished Secondary analysis of the DiGest randomised controlled trial

Authors' conclusion

In women with GDM, PCOS was not associated with increased risks for most suboptimal pregnancy outcomes or reduced efficacy of a dietary intervention in this cohort where BMI and glycemia were comparable.

Study context

Population
Pregnant women with GDM and BMI ≥25 kg/m², 8 UK centres; randomised to reduced-energy diet (1200 kcal/day) or standard-energy control diet (2000 kcal/day) from 29 weeks until delivery
Participants
425 women
Comparison
Polycystic ovary syndrome (PCOS) vs no PCOS in women with GDM
  • PCOSn = 50
  • No PCOSn = 375reference
Primary endpoint
Pregnancy outcomes, incl. maternal weight, CGM metrics, physical and dietary data, infant birthweight and jaundice
Methodological detailsdouble-blind, multicentre
  • Double-blind
  • Multicentre

Primary result

As reported in the abstract

Pregnancy outcomes
  • Similar baseline characteristics, glycaemia, BMI and pregnancy outcomes in PCOS vs GDM alone

Further findings

Neonatal jaundice

P = 0.002

Outcomes across dietary interventions

Outcomes across the dietary interventions were similar in women with and without PCOS

Original publication

Association between polycystic ovary syndrome and pregnancy outcomes in GDM: A secondary analysis of the DiGest trial. J Clin Endocrinol Metab. Published 28 January 2026. doi:10.1210/clinem/dgag026

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