Effects of Combined Diet and Physical Activity on Gestational Weight Gain in Low-Risk Pregnant Women Based on the TIDieR Checklist: A Systematic Review and Meta-Analysis

BACKGROUND: While combined diet and physical activity interventions are recommended, evidence specific to low-risk pregnant women remains limited. As responses to combined interventions may vary by pre-pregnancy BMI, maternal health status and pregnancy outcomes, targeted evaluation in low-risk pregnant women is needed. Inconsistencies across studies, along with the lack of a comprehensive synthesis of both effects and intervention components, further limit their implementation. OBJECTIVE: Our aims were to assess the effects of combined diet and physical activity interventions on gestational weight gain among low-risk women and to systematically characterize the intervention components. DESIGN: guidelines and PRISMA 2020. METHODS: Eight databases and trial registries were searched from inception to 16 March 2026. Two reviewers independently conducted study selection, data extraction and risk of bias assessment. Intervention components were coded using the TIDieR checklist. The quality of included studies was assessed using the updated Cochrane risk of bias 2.0 tool. Meta-analyses were performed using Review Manager 5.4, and certainty of evidence was assessed using the GRADEpro online tool. RESULTS: = 0.0004). CONCLUSIONS: Combined diet and physical activity interventions were associated with reduced total GWG and lower EGWG risk in low-risk pregnant women. Intervention characteristics, such as individual delivery formats, combined face-to-face and remote formats, moderate frequency and implementation in healthcare facilities, may be related to intervention effectiveness. REGISTRATION NUMBER: CRD420251013116 (PROSPERO).