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 .
Cardiorespiratory fitness, adiposity, and serum 25-dihydroxyvitamin D levels in women: the Cooper Center Longitudinal Study.
PURPOSE We examined the cross-sectional associations among cardiorespiratory fitness ( CRF ) , different measures of adiposity , and serum vitamin D levels in women . METHODS Between 2007 and 2010 , 1320 women completed a health examination . Measures included body mass index ( BMI ) , waist circumference ( WC ) , waist/hip ratio , percent body fat , CRF based on a maximal treadmill exercise test , and measurement of serum vitamin D.  Participants were classified by CRF as unfit ( lowest 20 % ) and fit ( remaining 80 % ) based on age , as well as by clinical cutoff points for adiposity measures , and by categories of serum vitamin D. We examined trends of CRF and adiposity exposures across serum vitamin D categories . We calculated odds ratios ( OR ) of serum vitamin D insufficiency or deficiency across levels of adiposity exposures before and after adjustment for CRF . RESULTS We observed a significant positive trend for CRF across incremental serum vitamin D categories ( p<0.001 ) . When compared to ORs for normal weight women , ORs for serum vitamin D insufficiency or deficiency were significantly higher for overweight women within each adiposity exposure ( p<0.05 ) . When grouped into categories of fit and unfit ( upper 80 % and lower 20 % of CRF distribution , respectively ) ,  serum vitamin D  was significantly lower in unfit than in fit women within each stratum of WC and waist/hip ratio and within the normal weight BMI stratum . CONCLUSIONS Serum vitamin D levels are positively associated with CRF and negatively associated with different measures of adiposity in women . Higher CRF attenuates the relationship between adiposity level and serum vitamin D. Future prospect i ve studies are warranted
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 .