Vitamin D plays an important role in over-all health. Few data exist on vitamin D deficiency related with intake for a Canadian population. The purpose of this study is to assess vitamin D intake and status in healthy young adults of diverse ancestry during the wintertime.<p>
One hundred and seven young healthy adults living in Southern Ontario were recruited during the late winter of 2007. Their serum 25-hydroxyvitamin D [25(OH)D], skin melanin and anthropometric measures were determined. They completed a food frequency questionnaire (FFQ) (twice) and a 7-day food diary. Correlation analyses and t-test were used to validate the FFQ against the 7-day diary and 25(OH)D; one way ANOVA was used to determine ethnic group differences in vitamin D intake and status.<p>
The results indicated that the FFQ used in this study was valid. Vitamin D deficiency [25(OH)D<50 nmol/L] was widespread and more apparent in the East and South Asian groups than in the European group (P<0.05). The dairy products were the greatest food source of vitamin D for each of the three groups and the European group exhibited higher total vitamin D intake (P<0.05). There was a trend for the European group to have higher consumption of dairy products, especially cow¡¯s milk (0.05<P<0.10). Combining subjects in the three ethnic groups, vitamin D intake but not BMI was closely related with serum 25(OH)D concentrations (r= 0.520, P<0.001; r=-0.018, P>0.05, respectively). The 25(OH)D levels were inversely related with parathyroid hormone (PTH) levels (r= -0.273, P= 0.009). With adequate calcium intake (¡Ý1000 mg/d), PTH levels were significantly lower when vitamin D was not deficient (P<0.05).<p>
This study provides evidence that vitamin D deficiency is prevalent in healthy young adults living in Canada during wintertime, and non-European groups have a higher prevalence of this deficiency. Vitamin D intake varies with ethnicity, and dietary intake plays an important role in maintenance of serum vitamin D in wintertime. Compared with calcium intake, serum vitamin D levels may be a more important factor suppressing PTH levels.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:SSU.etd-12212008-165244 |
| Date | 12 January 2009 |
| Creators | Wu, Hongyu |
| Contributors | Paterson, Phyllis G., Zello, Gordon A., Whiting, Susan J., Dahl, Wendy |
| Publisher | University of Saskatchewan |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://library.usask.ca/theses/available/etd-12212008-165244/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Saskatchewan or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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