Introduction: Obesity is a disorder of energy balance contributing foraltered respiratory functions. Method: A total of 30 non obese and 30 obese medical students in age group of 18-25 years who have satisfied inclusion and exclusion criteria and have consented to participate in study were enrolled. Each enrolled subjects height, weight and baseline blood pressure (BP) was recorded and evaluation of ventilatory function was done using Wright__ampersandsignrsquo;s peak flow meter. Result: There was significant decline in ventilatory functions in obese normotensive as compare to non obese students. In long term we can conclude that obesity adversely affects lung functions and which is controlled adequately if active interventions are taken. (Weight reduction, life style changes and physical exercise) to prevent obesity related respiratory sequelae in future.