Obesity has emerged as an important risk factor for chronic respiratory diseases such as chronic obstructive pulmonary disease (COPD), asthma, obstructive sleep apnea and obesity hypoventilation syndrome. It has emerged as an important risk factor for these respiratory diseases, and in many instances weight loss is associated with important symptomatic improvement. All subjects were explained about the procedures to be undertaken and written informed consent was obtained from them. A brief history, general physical examination and clinical examination of all the systems were done to exclude medical problems and to prevent confounding of results. The mean PEFR in obese male subjects was 5.89±0.85 (75.00±6.53% of percentage predicted). There was statistically significant decrease in the value of PEFR in obese male subjects compared to non-obese male controls (p< 0.001).