Objective: The primary objective of the study was to find out the prevalence of vitamin D deficiency among overweight and obese college going adolescents in summer and winter seasons. 

Methods: Survey was conducted with a pre-tested self-administered questionnaire to find out the socio-economic background, health profile and physical activity behavior among the college students (n=750) between 17 and 19 years of age studying in Government Arts and Science Colleges in Puducherry. For the biochemical analysis of vitamin D, a subsample of 60 willing obese adolescents was selected. 

Results: Mean weight of obese girls was lower (77%) than boys (81%) whereas waist circumference of girls was higher (85cm) than that of boys (79%). Percentage of bone mass was higher in males (3%) than in females (2%). Only 10% of girls and 40% of boys had normal level of vitamin D in summer. In winter season both obese girls and boys were categorized in the groups if either deficiency (87%) or insufficiency (77%). Sunlight exposure, regular exercise and physical activity were found to be very low in vitamin D deficient adolescent girls than in boys. 

Conclusion: Unhealthy food habits, physical inactivity, inadequate sunlight exposure were the primary factors which contributed to vitamin D deficiency in obese adolescents more in