Pregnancy lifestyle interventions incorporating walking, swimming, and strength training significantly reduce the risk of gestational diabetes, according to a major international study published in The BMJ, though researchers note that participants from lower educational backgrounds benefit less from these structured programs.
Global Collaboration Examines Over 100 Randomized Trials
Gestational diabetes remains a pressing health concern characterized by high blood sugar during pregnancy, carrying elevated risks of preterm birth, pre-eclampsia, and stillbirth, alongside longer-term risks of cardiovascular disease and type 2 diabetes for both mother and child. To address climbing global rates without standardized preventive guidance, researchers from the UK, Europe, Australia, North America, and Asia brought together data from more than 100 randomised trials involving nearly 36,000 pregnant women.
King’s contributed data from the UPBEAT study, led by Professor Lucilla Poston, which evaluated dietary and physical activity interventions across 1,500 pregnant women with obesity in inner-city UK settings. Funded by the National Institute for Health and Care Research, the international analysis identified that physical activity-based programs—including walking, aerobic exercise, strength training, and swimming—delivered the strongest preventative results without observed adverse effects.
“By combining a large number of trials with detailed individual-level data, we were able to identify not just whether lifestyle interventions work, but which elements make them most effective. As gestational diabetes continues to rise globally, this kind of evidence is crucial for designing interventions that work for all women.”
Professor John Allotey, University of Liverpool, via KCL
Identifying Delivery Formats and Socioeconomic Disparities
The findings point to specific structural factors that maximize the success of prenatal health programs. Group delivery formats and sessions led by newly trained facilitators achieved significantly greater benefits for participants.
However, the analysis uncovered an equity gap in how different populations respond to lifestyle initiatives. Women with lower educational attainment benefitted less from the evaluated lifestyle programs, pointing to underlying barriers in engagement and accessibility.
“However, we observed that women with lower educational attainment benefitted less from these programmes. This highlights the need for tailored approaches that address barriers to engagement and ensure equitable access to support.”
Professor Shakila Thangaratinam, University of Liverpool, via KCL
The study authors emphasize that because the research relied primarily on data from high-income nations, future work must explore culturally adapted and technology-enabled interventions to reach diverse demographic groups effectively.
Clinical Exercise Protocols and Feasibility Trials
Complementing large-scale epidemiological reviews, localized feasibility trials provide insight into how structured physical activity alters insulin resistance and body composition during pregnancy.
The study administered an eight-week physical activity intervention paired with a validated educational booklet detailing condition management and exercise precautions. The regimen featured in-person sessions every two weeks, progressive activity adjustments, weekly motivational phone calls, and exercise diaries.
Dispelling Misconceptions Around Pregnancy and Resistance Training
Clinical guidelines continue to evolve regarding safe exertion levels during gestation. Medical experts recommend that expecting mothers aim to exercise on most days of the week for at least 30 minutes at a moderate intensity.
Integrating Preventive Care into Routine Antenatal Services
“Lifestyle interventions in pregnancy are an achievable, evidence-based approach to improving maternal and offspring health and should be supported through policy and practice.”
Professor Shakila Thangaratinam, University of Liverpool, via Kcl
