Original Article

International Journal of Obesity (2006) 30, 1422–1432. doi:10.1038/sj.ijo.0803279; published online 7 March 2006

Childhood IQ in relation to obesity and weight gain in adult life: the National Child Development (1958) Study

T Chandola1, I J Deary2, D Blane3 and G D Batty2,4

  1. 1Department of Epidemiology and Public Health, University College London, London, UK
  2. 2Department of Psychology, University of Edinburgh, Edinburgh, UK
  3. 3Department of Primary Care and Social Medicine, Imperial College London, London, UK
  4. 4MRC Social and Public Health Sciences Unit, University of Glasgow, Glasgow, UK

Correspondence: Dr GD Batty, MRC Social and Public Health Sciences Unit, University of Glasgow, 4 Lilybank Gardens, Glasgow G12 8RZ, UK. E-mail: david-b@msoc.mrc.gla.ac.uk

Received 28 July 2005; Revised 12 December 2005; Accepted 31 December 2005; Published online 7 March 2006.

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Abstract

Objective:

 

To examine the relation of childhood intelligence (IQ) test results with obesity in middle age and weight gain across the life course.

Methods:

 

We analysed data from the National Child Development (1958) Study, a prospective cohort study of 17 414 births to parents residing in Great Britain in the late 1950s. Childhood IQ was measured at age 11 years and body mass index (BMI), an indicator of adiposity, was assessed at 16, 23, 33 and 42 years of age. Logistic regression (in which BMI was categorised into obese and non-obese) and structural equation growth curve models (in which BMI was retained as a continuous variable) were used to estimate the relation between childhood IQ and adult obesity, and childhood IQ and weight gain, respectively.

Results:

 

In unadjusted analyses, lower childhood IQ scores were associated with an increased prevalence of adult obesity at age 42 years. This relation was somewhat stronger in women (ORper SD decrease in IQ score [95% CI]: 1.38 [1.26, 1.50]) than men (1.26 [1.15, 1.38]). This association remains statistically significant after adjusting for childhood characteristics, including socio-economic factors, but was heavily attenuated following control for adult characteristics, particularly education (women: 1.11 [0.99, 1.25]; men: 1.10 [0.98, 1.23]). When weight gain between age 16 and 42 years was the outcome of interest, structural equation modelling revealed that education and dietary characteristics in adult life mediated the association with childhood IQ.

Conclusions:

 

A lower IQ score in childhood is associated with obesity and weight gain in adulthood. In the present study, this relation appears to be largely mediated via educational attainment and the adoption of healthy diets in later life.

Keywords:

child, IQ

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