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Are overweight women at increased risk of obesity following pregnancy?

Published online by Cambridge University Press:  09 March 2007

H. E. Harris*
Affiliation:
Communicable Disease Surveillance Centre, Public Health Laboratory Service, LondonNW9 5EQ, UK Maternal and Child Health Research Programme, School of Chemical and Life Sciences, University of Greenwich, London SE18 6PF, UK
G. T. H. Ellison
Affiliation:
Maternal and Child Health Research Programme, School of Chemical and Life Sciences, University of Greenwich, London SE18 6PF, UK Institute of Urban Primary Health Care, Alexandra Health Centre, Johannesburg, South Africa
L. M. Richter
Affiliation:
Centre for Epidemiological Research in Southern Africa, Medical Research Council, Pretoria, South Africa
T. De Wet
Affiliation:
Birth to Ten, Urbanisation and Health Programme, Medical Research Council, University of the Witwatersrand Medical School, Johannesburg, South Africa
J. Levin
Affiliation:
Centre for Epidemiological Research in Southern Africa, Medical Research Council, Pretoria, South Africa
*
*Corresponding author:Dr Helen E. Harris, fax +44 (0) 181 200 7868, email [email protected][email protected]
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Abstract

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Longitudinal studies suggest that women who already have a high BMI are at greater risk of maternal obesity than their lighter counterparts. The aim of the present study was to investigate this possibility by examining the relationship between reproductive history and maternal BMI in a community of 627 women from South Africa with a high prevalence of obesity. Standardized questionnaires were used to obtain detailed sociodemographic and behavioural information, while maternal weight and height were both measured at the time of the interview. Analysis of covariance (ANCOVA) showed that maternal age (r2 0·015, P = 0·001), smoking status (r2 0·012, P = 0·036), and social support (r2 0·011, P = 0·006) were all independently associated with maternal BMI. If overweight women were at increased risk of maternal obesity, then the positive relationship between reproductive history and maternal BMI should be enhanced in this relatively obese community, yet the ANCOVA models showed no independent association between gravidity and maternal BMI after controlling for the effects of confounding factors. Although previous longitudinal studies have found a positive association between prepregnant weight and long-term weight gain, this relationship might arise because overweight women gain more weight over a fixed period of time than normal weight women, and therefore they may appear to be at greater risk of pregnancy-related weight gains. Overweight women are at greater risk of weight gain generally, but there is little unequivocal evidence to suggest that they are at any increased risk of maternal obesity, when compared with women of lower BMI.

Type
Human and Clinical Nutrition
Copyright
Copyright © The Nutrition Society 1998

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