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This review summarizes evidence on the impact of preconception overweight and obesity on maternal and fetal health.

The impact of obesity and overweight on maternal and fetal health with conservative preconception interventions: a structured narrative review

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Structured narrative review summarizes effects of preconception interventions on maternal obesity outcomes, suggesting possible benefits.

This review summarizes evidence on the impact of preconception overweight and obesity on maternal and fetal health.
Conducted a structured narrative review using PubMed and Embase.
Included studies from January 2019 to December 2023 with a focus on preconception interventions.
Synthesized findings narratively due to study design heterogeneity.
Thirteen studies were included, showing that higher preconception BMI correlates with adverse pregnancy outcomes.
Conservative interventions produced mixed results on weight loss and pregnancy-related health outcomes.
Some evidence indicated that significant weight loss before pregnancy can improve fertility and reduce the risk of gestational diabetes mellitus.

Mateusz et al. (2026) studied this question.

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