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Obesity does not worsen asthma, but may reduce response to medications
Date:6/2/2009

Being overweight or obese does not make asthma worse in patients with mild and moderate forms of the disease, according to a study by National Jewish Health researchers, although it may reduce the response to medications.

"With both asthma and obesity on the rise in recent years, there has been much interest in the possible link between these two conditions," said lead author E. Rand Sutherland, Associate Professor of Medicine at National Jewish Health. "By studying a well characterized group of patients with asthma, we were able to determine that increased weight is not associated with more severe asthma. Although benefits can be obtained with weight loss in other diseases, these findings suggest that an improvement in asthma may not necessarily result from weight loss."

"The findings also suggest that patients and physicians should be aware that obese asthma patients may not respond well to corticosteroids, the most successful controller medication for asthma, which can affect dosing decisions and choices of possible alternatives to steroids."

Previous studies have suggested that obesity predisposes people to developing asthma, to suffer more severe asthma symptoms, and to respond less to medications. However, the exact mechanism for these links has been unclear, and the studies have generally relied upon patients' reports of their diagnosis and symptoms rather than using more precise tools to characterize patients.

Dr. Sutherland and his colleagues decided to examine the issue in a well characterized group of 1,256 patients who had participated in NIH-sponsored studies. They divided them into patients with a body mass index of less than 25 (lean) and greater than or equal to 25 (overweight and obese). They found that lean asthma patients had slightly greater forced expiratory volume in one second , or FEV1 (3.05 liters vs 2.91 liters), and slightly greater ratio of FEV1 to forced vital capacity (83.5% vs. 82.4%), both common
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Contact: William Allstetter
allstetterw@njc.org
303-398-1002
National Jewish Medical and Research Center
Source:Eurekalert

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