This systematic review and meta-analysis examined the effects of nutritional interventions during pregnancy on maternal and neonatal outcomes. The authors aimed to synthesize randomized controlled trial evidence to determine whether targeted dietary measures, counseling, or food-supply programs delivered in pregnancy influence birth outcomes and maternal complications.
The review adhered to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidance and was registered in PROSPERO (CRD42024528918). The authors conducted systematic searches for randomized controlled trials published from 2014 through 2024. Searches were completed between May and July 2024. Methodological quality of included trials was assessed using the Revised Cochrane Risk of Bias tool, version 2. The certainty of evidence across outcomes was rated with the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach. Pooled estimates were calculated using a random-effects model.
Twenty-three randomized controlled trials met inclusion criteria and were pooled in the meta-analysis, encompassing a total of 9,389 participants. Trials spanned the 2014–2024 publication window specified by the review. The source reports aggregated findings across these trials; individual trial-level details and exact intervention protocols are presented in the original article.
Pooled results indicated several statistically significant benefits associated with antenatal nutritional interventions. Specifically, interventions were associated with a modest increase in birth weight within healthy limits. They were also linked to reduced risks of low birth weight, small for gestational age (SGA), preterm birth, and gestational diabetes mellitus (GDM). These findings support the potential role of structured nutritional strategies during pregnancy in lowering important adverse outcomes for both mother and infant.
For a range of other maternal and neonatal endpoints, the meta-analysis did not find statistically significant effects. No clear benefit was observed for macrosomia or large for gestational age infants. Measures of neonatal size such as birth length and head circumference were not significantly altered by the interventions. Maternal outcomes including gestational hypertension, preeclampsia, and anemia showed no significant differences between intervention and control groups. Mode of birth (cesarean delivery) and neonatal intensive care unit (NICU) admission rates were also not significantly affected in pooled analyses.
The review included subgroup analyses to explore which program features were associated with larger effects. Greater benefits were reported for interventions that incorporated personalized counseling, for programs that consisted of four or more counseling sessions, and for those that included an element of food supply. These subgroup findings suggest that intensity, personalization, and access to food resources may enhance the effectiveness of antenatal nutritional interventions.
Trial-level methodological quality was evaluated with the Revised Cochrane Risk of Bias tool (version 2). The authors used GRADE to rate the certainty of evidence for outcomes. The abstract summarizes significant and non-significant pooled results but does not provide detailed GRADE ratings or the numerical effect estimates in the abstract text. For full details on risk-of-bias judgements, certainty ratings, and quantitative effect sizes, readers should consult the full article.
The authors conclude that nutritional interventions during pregnancy can play a crucial role in reducing adverse outcomes such as gestational diabetes mellitus and preterm birth, and in lowering the incidence of low birth weight and SGA. They suggest that integrating structured nutritional counseling and support into routine antenatal care may contribute to improved maternal and child health at the population level. Subgroup results highlight that more intensive, personalized programs and those that provide food have stronger associations with benefit.
The abstract provides a concise summary of methods and principal findings but does not report detailed numerical effect sizes, confidence intervals, or the specific GRADE certainty ratings for each outcome. Individual trial characteristics, intervention components, and context-specific considerations are included in the full text and referenced materials of the source article. These elements are necessary for implementation planning and for tailoring interventions to specific practice settings.
Based on pooled randomized trial evidence summarized in this review, antenatal nutritional interventions—particularly personalized, multi-session counseling and programs that include food provision—are associated with improvements in several key maternal and neonatal outcomes and may be a valuable component of comprehensive antenatal care.