OBJECTIVES: Obesity is reported to be underlying cause of metabolic syndrome and associated with hypertension and diabetes .A BMI (body mass index) of more than 30 places individuals in obese category. Majority of urban Indian population is categorized being overweight (BMI greater than 25). A sedentary lifestyle and lack of exercise in Indian cities causes belly fat accumulation which is reported to be a risk factor for metabolic diseases.METHODS:  In this study, we have categorized middle class Indian population (test subjects >500) residing in metropolitan Delhi area into different age groups (11-20, 21-30, 31-40, 41-50, 51-60 and 60 and above) and recorded BMI and degree of belly fat present (no excess belly fat, small, medium and high). Our data shows that age groups 11-20 and 21-30 show normal BMI and lower cases of accumulated belly fat whereas there is a significant increase (50%) in BMI and presence of belly fat in age group 31-40 and above. We also recorded presence of obesity related metabolic disorders such as diabetes and hypertension in the above mentioned age groups.RESULTS: Test subjects in all age groups with BMI >25 (over-weight and obese) recorded presence of related disorders (39.40% in over-weight and 67.34% in obese classes). Most prevalent diseases with higher BMI were hypertension, diabetes, and joint pain in decreasing order.CONCLUSIONS:  The sudden increase in obesity related factors is a matter of concern in the age group of 30 and above. We conclude that decrease in physical activity and sedentary lifestyle is the cause of belly fat accumulation and onset of obesity which results in metabolic diseases such as hypertension and diabetes. This information is most relevant for social awareness about obesity in middle class Indian population and through this study, it has been possible to alert the test subjects about risk of associated disorders.