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Tessa J Parsons a Department of
Paediatric Epidemiology and Biostatistics, Institute of Child Health,
London WC1N 1EH, b School of Public Health
and Community Medicine, Hebrew University, Jerusalem 91120, Israel
Correspondence to:
T Parsons t.parsons{at}ich.ucl.ac.uk
Objectives:
To determine the influence of birth
weight on body mass index at different stages of later life; whether this relation persists after accounting for potential confounding factors; and the role of indicators of fetal growth (birth weight relative to parental size) and childhood growth.
What is already known on this topic
What this study adds
Design:
Longitudinal study of the 1958 British
birth cohort.
Setting:
England, Scotland, and Wales.
Participants:
All singletons born 3-9 March 1958 (10 683 participants with data available at age 33).
Main outcome measures:
Body mass index at ages 7, 11, 16, 23, and 33 years.
Results:
The relation between birth weight and
body mass index was positive and weak, becoming more J shaped with increasing age. When adjustments were made for maternal weight, there
was no relation between birth weight and body mass index at age 33. Indicators of poor fetal growth based on the mother's body size were
not predictive, but the risk of adult obesity was higher among
participants who had grown to a greater proportion of their eventual
adult height by age 7. In men only, the effect of childhood growth was
strongest in those with lower birth weights and, to a lesser extent,
those born to lighter mothers.
Conclusions:
Maternal weight (or body mass index)
largely explains the association between birth weight and adult body
mass index, and it may be a more important risk factor for obesity in
the child than birth weight. Birth weight and maternal weight seem to
modify the effect of childhood linear growth on adult obesity in men.
Intergenerational associations between the mother's and her
offspring's body mass index seem to underlie the well documented
association between birth weight and body mass index. Other measures of
fetal growth are needed for a fuller understanding of the role of the
intrauterine environment in the development of obesity.
Birth weight has been shown to be positively related to subsequent
fatness
The relation between birth weight and adult body mass index was largely
accounted for by mother's weight
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