Exposure to Phthalates Is Associated with Overweight or Obesity in 4-Year-Old Children

Presentation Number: FRI 109
Date of Presentation: April 1st, 2016

Young Ah Lee*1, Hae Woon Jung1, Hwa Young Kim2, Gyung Min Lee3, So Youn Kim1, Kyung A Jeong1, Keun Hee Choi1, Youn-Hee Lim4, Sanghyuk Bae4, Yun-Chul Hong4, Choong Ho Shin1 and Sei Won Yang1
1Seoul National University Children's Hospital, Seoul, Korea, Republic of (South), 2Kangwon National University Hospital, Chuncheon-si, Korea, Republic of (South), 3Konyang University Hospital, Daejeon, Korea, Republic of (South), 4Seoul National University College of Medicine, Seoul, Korea, Republic of (South)

Abstract

Objective: To investigate associations between urinary phthalate metabolite concentrations and overweight or obese status in 4-year-old children

Methods: Forty-hundred thirteen children born as term, appropriate-for-gestational-age infants (226 males) were included in this study. Body mass index (BMI) was calculated based on height and weight at the visit. Children were classified into lean (n = 366) and overweight or obese (n = 47, ≥85th BMI percentile). Birth weight, parental BMI, breastfeeding, daily calorie intake, and weekly exercise hours were investigated. Urinary mono-(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP), mono-(2-ethyl-t-oxohexyl) phthalate (MEOHP), and mono-n-butyl phthalate (MnBP) were measured at ages 4. Urinary phthalate metabolites were ln-transformed (ln-MEHHP, ln-MEOHP, and ln-MnBP) for statistical analysis.

Results: The proportion of overweight or obese children was higher in girls than boys (15.5% vs. 8.0%, p <0.05). Overweight or obese children showed lower hours of weekly exercise (p=0.03), and higher concentrations of MEHHP (mean 78.0 vs. 62.7, p=0.034) and MEOHP (mean 58.8 vs. 48.3, p=0.044) than lean children, respectively. No significant differences in birth weight, paternal obesity, exclusive-breastfeeding, daily calorie intake, and levels of ln-MnBP were found between the two groups. No interaction of sex on the relationship between urinary phthalates and overweight or obesity was found. In multivariable models after adjusting for sex, birth weight, weekly exercise hours (including significant covariates in univariate analysis), each ln unit increase in MEHHP and MEOHP was associated with increased odds of overweight or obesity (OR=1.95 for MEHHP and 2.04 for MEOHP, p <0.05 for both). After additional adjustment for exclusive breastfeeding, parental obesity, parental college graduate, and daily calorie intake (including all previously well-known covariates), each ln unit increase in MEHHP and MEOHP was significantly associated with increased odds of overweight or obesity (p < 0.05 for both).

Conclusions: This study suggests positive relationships between urinary concentrations of MEHHP and MEOHP and overweight or obese status in 4-year-old children, even after adjusting for genetic and environmental confounders

 

Nothing to Disclose: YAL, HWJ, HYK, GML, SYK, KAJ, KHC, YHL, SB, YCH, CHS, SWY