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Updated: Dec 13, 2025

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Gestational Weight Gain-Re-Examining the Current Paradigm.

Jennie Louise1, Andrea R Deussen1, Jodie M Dodd1,2

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Current gestational weight gain (GWG) guidelines may be flawed. Research suggests diet and exercise have minimal impact on GWG, and current recommendations may not accurately reflect risks for all pregnant individuals.

Keywords:
causalgestational weight gainobesitypregnancy dietary and lifestyle intervention

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Area of Science:

  • Maternal-fetal medicine
  • Obstetrics and Gynecology
  • Public Health Nutrition

Background:

  • Current gestational weight gain (GWG) recommendations are based on assumptions regarding modifiability and associations with adverse pregnancy outcomes.
  • Pre-pregnancy body mass index (BMI) categories are used to define optimal GWG ranges.
  • The causal nature of the relationship between GWG and adverse outcomes requires further investigation.

Purpose of the Study:

  • To critically evaluate the assumptions underpinning the current GWG paradigm.
  • To examine the influence of diet and physical activity on GWG.
  • To assess the relationship between pre-pregnancy BMI, GWG, and birth weight z-scores.
  • To determine the causality of the association between GWG and adverse pregnancy outcomes.

Main Methods:

  • Analysis of data from three large, harmonized randomized controlled trials (RCTs) focused on GWG interventions.
  • Application of appropriate regression models to investigate key relationships.
  • Examination of the link between lifestyle factors (diet, physical activity) and GWG.
  • Evaluation of the causal evidence between GWG and pregnancy outcomes.

Main Results:

  • Limited evidence was found supporting the modifiability of GWG through diet and physical activity during pregnancy.
  • The observed associations between GWG and adverse pregnancy outcomes appear to be causal.
  • While optimal GWG may be lower for higher BMI categories, current BMI-defined ranges do not precisely reflect adverse outcome risks.
  • Findings challenge the efficacy of current GWG advice, especially for overweight and obese individuals.

Conclusions:

  • The current paradigm for gestational weight gain requires re-evaluation.
  • Diet and physical activity interventions show limited impact on GWG.
  • Existing GWG recommendations, particularly those based on BMI categories, may not be universally applicable or optimal for all pregnant individuals.
  • A shift in focus for GWG guidance is recommended, especially for women with higher pre-pregnancy BMI.