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Antibiotic use in early childhood and risk of obesity: longitudinal analysis of a national cohort

  • Dervla KellyEmail author
  • Alan Kelly
  • Tom O’Dowd
  • Catherine B. Hayes
Original Article

Abstract

Background

Taking oral antibiotics during childhood has been linked with an increased risk of childhood obesity. This study assessed any potential association in number of courses of antibiotics taken between 2–3 and 4–5 years of age and body mass trajectory up to age 5.

Methods

The study was a secondary analysis of 8186 children and their parents from the infant cohort of the Irish National Longitudinal Study of Children. Antibiotic use was measured by parental recall between ages 2–3 and 4–5. Longitudinal models described the relationship between antibiotic exposure and body mass index (BMI) standard deviation scores and binary outcomes, and examined interactions between covariates, which included socioeconomic status, diet assessed by food frequency questionnaires and maternal BMI.

Results

Any antibiotic usage between 2 and 3 years did not predict risk of overweight or obesity at age 5. Four or more courses of antibiotics between 2 and 3 years were independently associated with obesity at age 5 (odds ratio 1.6, 95% confidence interval 1.11–2.31). Effect size was modest (coefficient + 0.09 body mass SD units, standard error 0.04, P = 0.037). Maternal BMI modified the relationship: ≥ 4 courses of antibiotics between 2 and 3 years were associated with a + 0.12 body mass SD units increase in weight at age 5 among children of normal-weight mothers (P = 0.035), but not in children of overweight mothers.

Conclusions

Number of antibiotic courses, rather than antibiotic use, may be an important factor in any link between early antibiotic exposure and subsequent childhood obesity. Research is needed to confirm differential effects on babies of normal versus overweight/obese mothers independent of socioeconomic factors.

Keywords

Antibiotics Body mass index Early childhood Infants Obesity 

Notes

Author contributions

DK contributed to study design, data analysis, and manuscript writing and review. AK contributed to study design and data analysis. TOD contributed to study design, manuscript writing, and manuscript review. CH contributed to study design, data analysis, and manuscript writing and review. All authors approved the final version of the manuscript.

Funding

The National Study Longitudinal of Childhood—Growing Up in Ireland is funded by the Department of Children and Youth Affairs in Ireland. DK was funded by a stipend from Trinity College Dublin.

Compliance with ethical standards

Ethical approval

This study was approved by a specially-convened Research Ethics Committee of The National Study Longitudinal of Childhood—Growing Up in Ireland.

Conflict of interest

No financial or nonfinancial benefits have been received or will be received from any party related directly or indirectly to the subject of this article.

Supplementary material

12519_2018_223_MOESM1_ESM.docx (26 kb)
Supplementary material 1 (DOCX 26 kb)

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Copyright information

© Children's Hospital, Zhejiang University School of Medicine 2019

Authors and Affiliations

  1. 1.Department of Public Health and Primary CareTrinity College Dublin, Russell CenterDublin 24Ireland

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