association of serum 25-hydroxyvitamin d levels and vitamin d dietary intake with metabolic syndrome: a case control study

background: association between the vitamin d deficiency and metabolic syndrome (mets) has previously been noted and reported to be controversial. the aim of this study was to determine the association of serum 25 (oh) d level and vitamin d dietary intake with mets among iranian population . methods: this analytical study was conducted on 122 patients with mets based on the atpiii criteria and 128 subjects without mets as control from september 2010 to april 2011 . serum levels of calcium, phosphorus and 25(oh) d were compared between the two groups. a food frequency questionnaire (ffq) was used to calculate dietary intake. data were analyzed using chi- square test, t -test, mann-whitney u test and l ogistic regression analysis. results: serum concentrations of 25 (oh) d, calcium and phosphorus and calcium intake were significantly lower in subjects with mets compared to the subjects without mets . 98.4% of subjects with mets and 88.3% without mets had vit. d deficiency and this difference was statistically significant ( p =0.005). in regression analysis, lower concentration of serum 25 (oh) d, calcium and phosphorus and lower calcium and diary intake were predictors of mets . conclusions: serum 25 (oh) d level, calcium and phosphorus and calcium intake are associated with metabolic syndrome . however, the mechanism of this association requires further studies.