title: Vitamin D supplement consumption is required to achieve a minimal target 25-hydroxyvitamin D concentration of > or = 75 nmol/L in older people.
abstract: Population level data on how older individuals living at high latitudes achieve optimal vitamin D status are not fully explored. Our objective was to examine the intake of vitamin D among healthy older individuals with 25-hydroxyvitamin D [25(OH)D] concentrations > or =75 nmol/L and to describe current sources of dietary vitamin D. We conducted a population-based, cross-sectional study of 404 healthy men and women aged 69 to 83 y randomly selected from the NuAge longitudinal study in Québec, Canada. Dietary intakes were assessed by 6 24-h recalls. We examined the contribution of foods and vitamin/mineral supplements to vitamin D intake. Serum 25(OH)D was assessed by RIA. We assessed smoking status, season of 25(OH)D measurement, physical activity, and anthropometric and sociodemographic variables. Vitamin D status was distributed as follows: 7% (<37.5 nmol/L), 48% (37.5-74.9 nmol/L), and 45% (> or = 75 nmol/L). Vitamin D intake from supplements varied across the 3 vitamin D status groups: 0.5, 4.1, and 8.9 microg/d, respectively (P < 0.0001). Adding food sources, these total intakes were 4.6, 8.7, and 14.1 microg/d, respectively. In multivariate analysis, vitamin D from foods and supplements and by season was associated with vitamin D status. These healthy, community-dwelling older men and women with 25(OH)D concentrations >75 nmol/L had mean intakes of 14.1 microg/d from food and supplements. Supplement use is an important contributor to achieve a minimal target of 25(OH)D concentration > or = 75 nmol/L.
authors.affiliation: School of Dietetics and Human Nutrition, McGill University, Montreal, Québec, Canada H9X 3V9.
authors.forename: Roula
authors.initials: R
authors.lastname: Baraké
authors.forename: Hope
authors.initials: H
authors.lastname: Weiler
authors.forename: Hélène
authors.initials: H
authors.lastname: Payette
authors.forename: Katherine
authors.initials: K
authors.lastname: Gray-Donald
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D015930:Diet Records; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D008297:Male; D009751:Nutritional Requirements; D011792:Quebec; D014807:Vitamin D / Q000008:administration & dosage* / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D