In conclusion , the deficiency of vitamin D is associated with an increased level of BMI in the studies of both diabetic and non-diabetic subjects .
The deficiency of vitamin D is prevalent all over the world .
Studies have shown that vitamin D may play an important role in the development of obesity .
The current study was conducted to quantitatively evaluate the association between serum 25-(OH ) vitamin D levels  and the risk of obesity in both diabetic and non-diabetic subjects .
Impact of dietary and lifestyle on vitamin D in healthy student girls aged 11-15 years.
OBJECTIVE To study daily intake of calcium , phosphorus and vitamin D , to determine the biochemical findings of rickets and the effect of sunlight exposure and vitamin D supplementation in school girls with hypovitaminosis D. METHODS A cross-sectional study was conducted on school girls aged 11 - 15 years selected r and omly from various areas of Tehran , Iran .  Dietary information and amount of sunlight exposure were estimated by a 7 day recalling method using self-reported question naire . Hypovitaminosis D defined as low serum 25-hydroxyvitamin D concentration with two or more others abnormal biochemical findings . Girls with hypovitaminoses D were r and omly divided into two groups . The faces and h and s of girls in group 1 were exposed to sunlight for one hour per day for twenty days , while those in group 2 were administered vitamin D capsules , 50,000 IU per day for the same period . RESULTS four-hundred fourteen girls evaluated , mean daily calcium intake , sunlight exposure and vitamin D acquirement were 360 mg , 10 minutes and 119 IU , respectively . Mean serum 25-hydroxyvitamin D concentration was 30 ng/ml among all girls whereas in 15 ( 3.63 % ) of 414 girls was 7.8 ng/ml . Abnormal biochemical findings in these girls included hypocalcemia ( n=4 ) , hypophosphatemia ( n=5 ) , raised serum alkaline phosphatase ( n=13 ) , and parathyroid hormone ( n=15 ) . After intervention , mean serum 25-hydroxyvitamin D concentration  in sunlight exposure ( n=8 ) and vitamin D ( n=7 ) supplementation increased to 14.4+/-4 ng/ml and 23+/-4 ng/ml respectively . There was a significant difference between the two groups ( p<0.05 ) . CONCLUSION Vitamin D deficiency developed in rapid growth period of girls without clear clinical rickets in sunny temperate climate city in Iran which vitamin D supplementation improved biochemical findings better than sunlight exposure
In conclusion , the deficiency of vitamin D is associated with an increased level of BMI in the studies of both diabetic and non-diabetic subjects .
The deficiency of vitamin D is prevalent all over the world .
Studies have shown that vitamin D may play an important role in the development of obesity .
The current study was conducted to quantitatively evaluate the association between serum 25-(OH ) vitamin D levels  and the risk of obesity in both diabetic and non-diabetic subjects .