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79 percent of middle aged Americans had less than 32 ng of vitamin D – July 2010

Low vitamin D status is associated with physical inactivity, obesity and low vitamin D intake in a large US sample of healthy middle-aged men and women.

J Steroid Biochem Mol Biol. 2010 Jul;121(1-2):462-6. Epub 2010 Apr 22.
Brock K, Huang WY, Fraser DR, Ke L, Tseng M, Stolzenberg-Solomon R, Peters U, Ahn J, Purdue M, Mason RS, McCarty C, Ziegler RG, Graubard B.
Faculty of Health Sciences, University of Sydney (USyd), East Street (PO Box 170), Lidcombe, Sydney, NSW, Australia. K.Brock at usyd.edu.au

The aim of this study was to investigate modifiable predictors of vitamin D status in healthy individuals, aged 55-74, and living across the USA. Vitamin D status serum 25-hydroxyvitamin D (25(OH)D) was measured along with age and season at blood collection, demographics, anthropometry, physical activity (PA), diet, and other lifestyle factors in 1357 male and 1264 female controls selected from the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) cohort. Multivariate linear and logistic regression analyses were used to identify associations with vitamin D status. Three%, 29% and 79% of the population had serum 25(OH)D levels<25, <50 and <80 nmol/L, respectively.

The major modifiable predictors of low vitamin D status were
low vitamin D dietary and supplement intake,
body mass index (BMI) >30 kg/m2,
physical inactivity (PA) and l
ow milk and calcium supplement intake.

In men, 25(OH)D was determined more by milk intake on cereal and in women, by vitamin D and calcium supplement and menopausal hormone therapy (MHT) use. Thus targeting an increase in vigorous activity and vitamin D and calcium intake and decreasing obesity could be public health interventions independent of sun exposure to improve vitamin D status in middle-aged Americans. PMID: 20399270