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Why are poorer children at higher risk of obesity and overweight? A UK cohort study

Goisis, A., Sacker, A. and Kelly, Y. (2016) Why are poorer children at higher risk of obesity and overweight? A UK cohort study. European Journal of Public Health, 26 (1). pp. 7-13. ISSN 1101-1262

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Identification Number: 10.1093/eurpub/ckv219


There is limited evidence on which risk factors attenuate income inequalities in child overweight and obesity; whether and why these inequalities widen as children age. Method: Eleven thousand nine hundred and sixty five singletons had complete data at age 5 and 9384 at age 11 from the Millennium Cohort Study (UK). Overweight (age 5 : 15%; age 11 : 20%) and obesity (age 5 : 5%; age 11 : 6%) were defined using the International Obesity Taskforce body mass index cut-points. To measure socioeconomic inequalities, we used quintiles of family income and as risk factors, we considered markers of maternal health behaviours and of children’s physical activity, sedentary behaviours and diet. Binary and multinomial logistic regression models were used. Results: The unadjusted analyses revealed stark income inequalities in the risk of obesity at age 5 and 11. At age 5, children in the bottom income quintile had 2.0 (95% CI: 1.4–2.8) increased relative risk of being obese whilst at age 11 they had 3.0 (95% CI: 2.0–4.5) increased risk compared to children in the top income quintile. Similar income inequalities in the risk of overweight emerged by age 11. Physical activity and diet were particularly important in explaining inequalities. Income inequalities in obesity and overweight widened significantly between age 5 and 11 and a similar set of risk factors protected against upward and promoted downward movements across weight categories. Conclusions: To reduce income inequalities in overweight and obesity and their widening across childhood the results support the need of early interventions which take account of multiple risk factors.

Item Type: Article
Official URL:
Additional Information: © 2015 The Author. Published by Oxford University Press on behalf of the European Public Health Association.
Divisions: Social Policy
Subjects: H Social Sciences > HN Social history and conditions. Social problems. Social reform
R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RJ Pediatrics > RJ101 Child Health. Child health services
Date Deposited: 02 Nov 2015 14:22
Last Modified: 20 Oct 2021 03:21
Projects: ES/J019119/1
Funders: Economic and Social Research Council

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