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| |  Obesity Does Not Worsen Asthma, But May Effect Response to Medications DENVER, Colo -- June 3, 2009 -- Being overweight or obese does not make asthma worse in patients with mild and moderate forms of the disease, although it may reduce the response to medications, according to a study published in the June issue of the Journal of Allergy and Clinical Immunology. "With both asthma and obesity on the rise in recent years, there has been much interest in the possible link between these 2 conditions," said lead author E. Rand Sutherland, MD, National Jewish Health, Denver, Colorado. "By studying a well characterised 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," he said. "[This] 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 characterise patients. Dr. Sutherland and colleagues decided to examine the issue in a well characterised group of 1,256 patients who had participated in previous studies from the National Institutes of Health. They divided them into patients with a body mass index (BMI) less than 25 and greater than or equal to 25. They found that lean asthma patients had slightly greater forced expiratory volume in one second (FEV1; 3.05 liters vs 2.91 liters), and slightly greater ratio of FEV1 to forced vital capacity (83.5% vs 82.4%). They also found slightly greater use of rescue inhalers among overweight patients (1.2 puffs per day vs 1.1 puffs per day) and slightly higher scores asthma-relate quality of life questionnaires (5.77 vs 5.59). "These differences were small and are unlikely to be of any real clinical significance," said Dr. Sutherland. Response to medications, however, did show an effect of increased weight. Among a subgroup of 183 people, lean patients taking inhaled corticosteroids alone showed a 55% greater reduction in exhaled nitric oxide. Lean patients taking a combination inhaled steroid and long-acting beta agonist increased their FEV1 by 80 more milliliters. There were no differences, however, between these patients in the number of asthma exacerbations. The data suggest overweight and obese people respond less well to controller medications for asthma than do their lean counterparts," said Dr. Sutherland. "These data come from already-completed studies designed to answer other questions, however, and ongoing studies are being conducted to more definitively determine the effect of increased weight on treatment response in asthma." SOURCE: National Jewish Medical and Research Center
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