Vitamin D status of older adults of diverse ancestry living in the greater Toronto area

BMC Geriatrics

Esteban J Parra⁵  Susan Whiting⁴  Heather Hanwell¹  Agnes Gozdzik²  S Krithika⁵  Jaime K Ginter³ 

[1] Department of Neurosciences and Mental Health, Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada;Centre for Research on Inner City Health, The Keenan Research Centre in the Li Ka Shing Knowledge Institute of St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada;Trent University Archaeological Research Centre (TUARC), Trent University Peterborough, Peterborough, ON K9J 7B8, Canada;College of Pharmacy and Nutrition, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada;Department of Anthropology, University of Toronto at Mississauga, 3359 Mississauga Road North, Mississauga, ON L5L 1C6, Canada

关键词: Community-dwelling;    Canada;    Diverse ancestry;    Older adults;    Serum 25(OH)D concentration;    Vitamin D;   

Others  :  857581
DOI  :  10.1186/1471-2318-13-66

 received in 2013-03-25, accepted in 2013-06-12,  发布年份 2013

【 摘 要 】

Background

Physiological and lifestyle factors put older adults at an increased risk of vitamin D insufficiency and resulting negative health outcomes. Here we explore the vitamin D status in a sample of community dwelling older adults of diverse ancestry living in the Greater Toronto area (GTA).

Methods

Two hundred and twenty-four (224) adults over 60 years of age were recruited from the Square One Older Adult Centre, in Mississauga, Ontario. Circulating 25-hydroxyvitamin D (25(OH)D) concentrations were measured from dried blood spot cards. Dietary and supplemental intakes of vitamin D were assessed via questionnaires. Skin pigmentation was assessed quantitatively by measuring melanin levels using a reflectometer.

Results

The mean 25(OH)D concentration in the total sample was 82.4 nmol/L. There were no statistically significant differences in serum 25(OH)D concentrations, supplemental or dietary vitamin D intakes between the three major ancestral groups (East Asians, Europeans and South Asians). Females had significantly higher 25(OH)D concentrations than males (84.5 nmol/L vs. 72.2 nmol/L, p = 0.012). The proportion of participants with 25(OH)D concentrations below 50 nmol/L and 75 nmol/L were 12.1%, and 38.8%, respectively. The mean daily supplemental intake of vitamin D was 917 IU/day. Vitamin D intake from supplements was the major factor determining 25(OH)D concentrations (p < 0.001).

Conclusions

Mean concentration of 25(OH)D in a sample of older adults of diverse ancestry living in the GTA exceeded 80 nmol/L, and there were no significant differences in 25(OH)D levels between ancestral groups. These results sharply contrast with our recent study focused on young adults of diverse ancestry living in the same geographic area, in which we found substantially lower 25(OH)D concentrations (mean 39.5 nmol/L), low supplemental vitamin D intake (114 IU/day), and significant differences in 25(OH)D levels between ancestral groups. High daily intake of supplemental vitamin D in this sample of older adults likely accounts for such disparate findings with respect to the young adult sample.

【 授权许可】

   
2013 Ginter et al.; licensee BioMed Central Ltd.

【 图 表 】

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