Wang MC, Shah NS, Petito LC, et al. - In the past decade, there has been a large increase in the population-attributable fractions for gestational diabetes mellitus associated with obesity. This highlights the relevance of optimizing weight before pregnancy.

• Researchers used US population-based birth data files maintained by the National Center for Health Statistics between 2011 and 2019 to perform this serial, cross-sectional study of live singleton births to nulliparous women aged 15–44 years.

• Included were 11,950,881 women.

• From 2011 to 2019, there were stable or decreased population-attributable fractions for gestational diabetes mellitus associated with overweight; stable for Hispanic: 12.0%–11.3%, non-Hispanic Asian: 12.1%–11.6%; and decreased for non-Hispanic White: 10.8%–9.4%, non-Hispanic Black: 12.3%–9.2%.

• Stable or increased population-attributable fractions for gestational diabetes mellitus associated with obesity were recorded; stable for non-Hispanic Black: 36.3%–37.9%; and increased for non-Hispanic White: 30.9%–33.3%, Hispanic: 27.2%–33.3%, non-Hispanic Asian 12.2%–15.4%.