© 2005 BMJ Publishing Group Ltd & British Thoracic Society
EDITORIAL
Asthma and obesity
Concurrent trends in asthma and obesity
Correspondence to:
Correspondence to:
Professor S Chinn
Department of Public Health Sciences, King’s College London, London SE1 3QD, UK; sue.chinn@kcl.ac.uk
Is the concurrent rise in the prevalence of asthma and obesity a red herring?
Keywords: asthma; obesity; children
| The first 150 words of the full text of this article appear below. |
Studies that have reported an association between asthma and obesity have mostly been single cross sectional studies, although an increased incidence of asthma in participants who were overweight at baseline has been reported in several longitudinal studies. The latter have contributed to the debate about the nature of the association, showing that the reverse causality explanation—that decreased physical activity as a result of asthma leads to increased weight—is not plausible. Cohort studies have the potential to determine whether increased symptoms of asthma are an immediate consequence of weight gain or, if not, to establish the lag, but frequent follow up would be required. However, pure cohort studies cannot answer the question of how much of the increase in the prevalence of asthma in a population can be explained by an increase in obesity, as age and period are completely confounded. Repeated cross sectional studies in the same
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