Effects of lifestyle interventions in pregnancy on gestational diabetes: individual participant data and network meta-analysis
This research study, published in 2026, found that lifestyle interventions during pregnancy are generally effective at preventing gestational diabetes. By analyzing data from over 35,000 women, researchers determined that physical activity-based interventions are the most effective strategy, ranking higher than diet-alone or mixed approaches. These exercise programs not only helped prevent diabetes but were also linked to a lower risk of cesarean sections and reduced the likelihood of babies being born significantly over or under a healthy weight. While dietary changes alone also showed benefits—particularly in reducing the risk of preterm birth—mixed interventions that combined diet and exercise often yielded inconsistent results, perhaps due to the difficulty of maintaining multiple lifestyle changes simultaneously.
The study highlighted that these health benefits apply broadly across different groups, as factors like maternal age, initial body mass index (BMI), and ethnicity did not change how well the interventions worked. However, a significant "equity gap" was identified: while women of all education levels benefited, those with lower education levels saw smaller improvements. This suggests that social and structural barriers, such as the cost of healthy food or limited access to safe exercise spaces, may impact how effectively some women can engage with these programs. Additionally, the researchers found that programs were more successful when delivered in group formats rather than individually, and when led by newly trained providers.
Ultimately, the findings suggest that lifestyle support should be a routine, integrated part of prenatal care rather than an optional addition. Researchers emphasize that any increase in activity is better than none, and women should be actively reassured that physical activity is safe during pregnancy. To maximize public health impact, future policies must focus on making these interventions accessible and culturally relevant to ensure that the benefits reach all mothers, regardless of their socioeconomic background.