Poster Topical Area: Community and Public Health Nutrition
Poster Board Number: 46
Objective: Low vitamin D concentrations are reported throughout populations in the United States. Food insecurity has been linked to lower intake of nutrients critical to optimal health. This analysis evaluated serum vitamin D concentrations and associations with food security (FS) in adults.
Methods: Data from NHANES 2011-2012 were used. Participants under age 18 years and those with missing FS status or vitamin D concentrations were excluded. Household FS (previous 12 months) was assessed using the U.S. Food Security Survey Module, classified as full, marginal, low, or very low FS. Low and very low FS were combined to "low FS" in analyses. Serum total 25OHD (25OHD2+25OHD3) was measured by ultra-high performance liquid chromatography-tandem mass spectrometry. 25OHD was examined continuously and by status: deficient (>30ng/mL), insufficient (20-30ng/mL), or sufficient (>30ng/mL). Mean 25OHD and prevalence of 25OHD and FS status were assessed. Multivariate linear regression assessed differences in mean 25OHD by FS status with Bonferroni corrections, adjusted for age, gender, race/ethnicity, annual income, body mass index, dietary vitamin D intake including supplements, and calorie intake (p<0.05). Analyses included NHANES sample weights and sampling units, conducted using SAS 9.4 survey procedures.
Results: 9,756 individuals were included (unweighted). Mean age was 59.7, 57.5% were female, and the majority were Non-Hispanic Whites (81.2%). Prevalence of low FS was 8.6%; marginal FS was 6.7%. Insufficient or deficient 25OHD concentrations were found in 27.4%. Those with 25OHD insufficiency or deficiency had a higher prevalence of low FS (25%) compared to 25OHD sufficient individuals (6.5%). Mean 25OHD in individuals with marginal FS (30.7ng/mL) and low FS (32.8ng/mL) was significantly lower than full FS (38.1ng/mL;p<0.0001). 25OHD was significantly lower in moderate compared to full FS only with adjustments (p=0.003).
Conclusions: NHANES participants had a high prevalence of food insecurity and relatively low prevalence of 25OHD insufficiency. Those classified with marginal FS had the lowest serum 25OHD. In addition to those with low FS, marginally FS individuals should be screened for low 25OHD and interventions may aim to ensure sufficient 25OHD concentrations in this population.
Funding Source: None
University of New Mexico
Albuquerque, New Mexico