Valladares T, et al. - Via this cross-sectional study involving 680 women (35 to 74 years of age), the possible association between 25-hydroxyvitamin D (25[OH]D) sufficiency and glycemia was investigated. The mean fasting blood glucose level of 105 mg/dL (range 26-401 mg/dL) was reported. Fasting serum levels of 25(OH)D in 65.4% of the participants were <30 ng/mL and in 25.6% were <20 ng/mL. Observations revealed a positive correlation of a serum 25(OH)D level <30 ng/mL, as well as of a serum 25(OH)D level <20 ng/mL, with a blood glucose level ≥100 mg/dL. Findings thereby support an association of lower serum 25(OH)D concentrations with high blood glucose levels.