Gestational diabetes history signals T2D 13 years earlier

Clinical takeaway: Ask about and document gestational diabetes when assessing women for diabetes risk. Arrange a 75 g oral glucose tolerance test 4 to 12 weeks postpartum and lifelong screening every one to three years. If type 2 diabetes develops, be alert for younger onset and a potentially earlier need to intensify treatment.

Gestational diabetes often resolves after delivery but remains an important marker of future type 2 diabetes risk. New Danish findings suggest that it may also identify women who develop type 2 diabetes substantially earlier and are more likely to receive insulin soon after diagnosis.

The research will be presented at the upcoming European Association for the Study of Diabetes Annual Meeting, being held September 28 to October 2 in Milan. Investigators analyzed 2,865 previously pregnant women enrolled in a nationwide cohort within two years of a type 2 diabetes diagnosis; 173 had prior gestational diabetes.

Women with that history were diagnosed at a median age of 43.5 years—nearly 13 years earlier than those without it, whose median age was 56.3 years. Approximately 40% developed type 2 diabetes before age 40, compared with 6% of women without prior gestational diabetes.

At enrollment, 10.4% of women with prior gestational diabetes were receiving insulin, versus 5.2% of those without it. Fasting C-peptide levels were also lower, potentially indicating less endogenous insulin production. However, BMI, A1c, fasting glucose, and calculated measures of insulin production and sensitivity were similar between groups.

Nephropathy, neuropathy, and cardiovascular disease rates were comparable. Retinopathy prevalence differed statistically, but the number of cases was too small to determine clinical relevance. The authors said the overall pattern may represent a distinct, potentially more severe type 2 diabetes phenotype, although greater complication burden was not established.

“These findings underscore the importance of enhanced monitoring and follow-up strategies for women with a prior GDM diagnosis,” the authors concluded.

Source: Petersen MH, et al. European Association for the Study of Diabetes 2026 Abstract 173. Clinical characteristics of women with newly diagnosed type 2 diabetes with or without a history of gestational diabetes