As a result of the rapidly growing rate of obesity worldwide, clinicians are struggling to provide the best strategies for treating obese patients with concomitant pulmonary conditions. Obesity does not simply change the epidemiology of pulmonary disease; obesity has a profound impact on the pathophysiology of common pulmonary diseases. Obesity affects the severity of asthma, response to treatment, and is likely a major modifier of the phenotype of asthma. Obesity also appears to affect response to pathogens, and as such has a major influence on response to pneumonia, and has a significant...