Prenatal exposure to a natural disaster increases risk for obesity in 5½-year-old children

Area of Science:

• Environmental Health
• Developmental Psychology
• Pediatric Endocrinology

Background:

• Prenatal maternal stress (PNMS) is linked to adverse birth outcomes like low birth weight.
• Low birth weight increases the risk of later cardiometabolic diseases, including hypertension and obesity.
• The independent effect of PNMS on childhood obesity risk, separate from birth characteristics, remains unclear in humans.

Purpose of the Study:

• To investigate if prenatal maternal stress (PNMS) from a natural disaster independently influences the risk of childhood obesity.
• To determine the association between objective PNMS exposure and childhood obesity status.
• To control for various confounding factors including birth characteristics and socioeconomic status.

Main Methods:

• A cohort of 111 mother-child pairs was studied, focusing on pregnancies around the 1998 Québec Ice Storm.
• Objective and subjective PNMS were assessed and correlated with childhood obesity at age 5½.
• Statistical models controlled for birth weight, breastfeeding, socioeconomic status, maternal health, and lifestyle factors.

Main Results:

• Children with high objective PNMS exposure had a significantly higher prevalence of obesity (14.5%) compared to those with low exposure (1.8%).
• Objective PNMS was found to increase the risk of childhood obesity (OR = 1.37) after accounting for other risk factors.
• The association remained significant even after controlling for birth characteristics and other potential confounders.

Conclusions:

• Prenatal maternal stress (PNMS) may serve as an independent risk factor for the development of childhood obesity.
• These findings highlight the long-term health implications of environmental exposures during pregnancy.
• Further research is warranted to elucidate the mechanisms linking PNMS to obesity.