Objectives: The aim of the present study was to investigate the relationship between nutrition and sunlight exposure on BMD levels in different age group between 30 to 75 years old subjects and to assess the relationship between age, sex and BMD in general population. Design: An observational cross sectional study of randomly selected in kanchipuram district aged from 30–75 years. Materials and methods: The study was conducted in the department of biochemistry, Meenakshi Medical College Hospital and Research Institute, Kanchipuram .Under this cross-sectional comparative study. 80 subjects of both sexes were subjected to the study. And subjects are divided into group 1(Age Group between 30-45), group 2 (Age Group between 46-60), and group 3 (Age Group between 61-75). Nutrition status and exposure to sunlight was collected by questionaries. Results: 80 adults between 30 to 75 years of both sexes were subjected to this study. People in the age group of 30-45 years were found to be more osteopenic particularly very high in females (males -0.97±1.2 and females -1.3±1.45) and people in the age group 61 to 75 years, were found to be osteoporotic (males -1.43±1.3 and females -2.08±0.95). Based on nutrition, 15 people of both sexes were selected who are vegetarian (-0.96 ± 0.6), 22 people were selected who take non-veg three times in a week (1.29 ± 0.92), and 28 people were selected who take non veg more than 3 times in a week (1.3 ± 0.77) and 15 people were selected who take both veg and non-veg in a week (1.38 ± 0.77). The results indicate that vegetarian taking people were got low BMD levels when compared to other groups. BMD level significantly increased in people exposed to sunlight for more than 10 minutes when compared to less exposed to sunlight. Conclusion: This study confirms that people of younger age group (30-45 years) are found to be more osteopenic when compared to the older age group (46-60 years) due to of less exposure in sunlight and low intake of vitamin D and calcium diets. Highlight of this study is “Osteopenia is more prevalent in the younger age group which necessitates earlier intervention”