Gestational diabetes mellitus (GDM) is one of the most common metabolic disorders during pregnancy and has been associated with higher risks of type 2 diabetes mellitus and cardiovascular disease after childbirth, independent of obesity, lifestyle, and socioeconomic factors. Whether GDM contributes to long-term mortality risk remains uncertain. A prospective analysis published in Diabetology & Metabolic Syndrome evaluated the association between a GDM-related metabolic signature derived from nuclear magnetic resonance (NMR) metabolomics and long-term mortality outcomes.

The study used data from the UK Biobank prospective female cohort, combining information on GDM history with NMR-based metabolomic profiles to characterize metabolic patterns associated with prior GDM. Cox proportional hazards models estimated associations between the GDM-related metabolic signature and all-cause and cause-specific mortality. The predictive contribution of the metabolomic signature beyond traditional risk factors was also examined, and sensitivity analyses were conducted to test the robustness of the results.

During a median follow-up of 13.5 years, each 1-standard deviation increase in the GDM-related metabolic signature corresponded to higher risks of all-cause mortality (hazard ratio [HR] 1.17; 95% confidence interval [CI] 1.15-1.19), cardiovascular mortality (HR 1.29; 95% CI 1.24-1.34), cancer mortality (HR 1.10; 95% CI 1.07-1.12), and respiratory mortality (HR 1.17; 95% CI 1.09-1.25). The metabolic profile included lower levels of glutamine, glycine, and histidine, increased small dense low-density lipoprotein particles, a lower linoleic acid ratio, and altered glycolytic intermediates. These metabolic characteristics were consistent with patterns reflecting insulin resistance, chronic inflammation, and altered energy metabolism.

In predictive analyses, incorporating the metabolic signature into conventional risk models improved risk reclassification for cardiovascular mortality (net reclassification improvement [NRI] 0.24; P<0.001), although changes in time-dependent area under the curve were modest. The findings indicate that a metabolomic profile linked to prior GDM corresponds to higher long-term risks of all-cause and cause-specific mortality, highlighting systemic metabolic alterations in women with a history of GDM and supporting metabolomics-based approaches for long-term risk assessment.