Dataset Information

Vitamin D status and intake of lactating Inuit women living in the Canadian Arctic.

ABSTRACT:

Objective

To determine the prevalence and correlates of healthy vitamin D status in lactating Inuit women living in remote regions of the Arctic.

Design

Cross-sectional.

Setting

Households were selected randomly in thirty-six communities of Nunavut, Nunatsiavut and Inuvialuit Settlement Region. Dietary intake was assessed using a 24 h recall and an FFQ. Anthropometric measurements, household living conditions, supplement use and health status were assessed. In fasting samples, serum 25-hydroxyvitaimn D (25(OH)D) was measured using a chemiluminescent assay (LIAISON; Diasorin Inc.).

Subjects

Lactating Inuit women participating in the 2007-2008 International Polar Year Inuit Health Survey conducted in the months of August to October.

Results

Among participants (n 34), 8·8, 26·5 and 50·0 % had 25(OH)D concentrations at or above 75, 50 and 40 nmol/l, respectively. More than one-third of participants did not consume traditional foods during the previous day and only 11·3 % of total energy intake was derived from traditional foods. Only 14·7 % of the sample consumed the daily number of milk servings recommended by Canada's Food Guide (two servings) for First Nations, Inuit and Métis. Using multivariable logistic regression to examine 25(OH)D≥40 nmol/l, only higher body fat was inversely correlated with 25(OH)D concentration.

Conclusions

The present study is the first to assess simultaneously vitamin D status and other known factors that affect it among lactating Inuit women living in remote communities in the Arctic. Healthy maternal vitamin D status was observed in 25 % of participants during the late summer and early autumn. This requires further assessment in a larger sample spanning more seasons.

SUBMITTER: El Hayek Fares J

PROVIDER: S-EPMC10261098 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Vitamin D status and intake of lactating Inuit women living in the Canadian Arctic.

El Hayek Fares Jessy J Weiler Hope A HA

Public health nutrition 20180213 11

<h4>Objective</h4>To determine the prevalence and correlates of healthy vitamin D status in lactating Inuit women living in remote regions of the Arctic.<h4>Design</h4>Cross-sectional.<h4>Setting</h4>Households were selected randomly in thirty-six communities of Nunavut, Nunatsiavut and Inuvialuit Settlement Region. Dietary intake was assessed using a 24 h recall and an FFQ. Anthropometric measurements, household living conditions, supplement use and health status were assessed. In fasting sampl ...[more]

PMID: 29433587

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Project description:Existing research shows an association between physical activity levels and vitamin D status in the elderly, men, women, children, and adolescent populations. This association has not yet been investigated in postpartum women. We hypothesized that based on the relationship between vitamin D and physical activity found in other populations, greater physical activity levels in postpartum women will be associated with higher serum 25(OH)D levels. A post hoc analysis of 286 postpartum women with self reported physical activity data from the America on the Move survey, and measured circulating serum 25(OH)D (measured by RIA) as an indicator of vitamin D status, was gathered at baseline (4-6 weeks postpartum), 4 months, and 7 months postpartum. The data were analyzed using SAS 9.4 (Cary, NC). 39.9% of women at visit 1 (baseline), 52.8% of women at visit 4 (month 4), and 55.9% of women at visit 7 (month 7) were meeting the NIH recommendation of 150min of moderate intensity (3-6 METs) physical activity per week. Significant differences were seen in physical activity by race (p=0.007). Caucasians were more likely to meet the standard recommendation than African Americans or Hispanics. Using multiple regression models to examine associations between duration of physical activity and 25(OH)D concentration, controlling for race, BMI, feeding type, and METs, it was found that at visit 1, an increase in physical activity was associated with an increase in 25(OH)D of 1.3nmol/L (p=0.03) and achieving at least 2.5h/wk of physical activity had a trending association with an increase in 25(OH)D of 7.23nmol/L (p=.05). At visit 4 (also controlling for treatment group and sun exposure) achieving at least 1.5h/wk of physical activity was associated with an increase in 25(OH)D of 11.73nmol/L (p=.04). By visit 7, no association between physical activity and maternal 25(OH)D was observed. In a repeated measures, mixed model analysis predicting maternal 25(OH)D during the study, achieving at least the recommended 150min per week of physical activity (>2.5h) was not significantly associated with vitamin D status (pNS). While no definitive conclusions can be drawn regarding precise levels of physical activity influencing 25(OH)D levels in postpartum women, the data suggest that increased activity during the first 4 months after birth is associated with improved vitamin D status. Additional research is needed because of the inconsistency seen at visit 7.

Project description:Few detailed data are available on the wide range of determinants of vitamin D status among postmenopausal women, and it is also unclear whether there may be undiscovered determinants. The objective of this study was to comprehensively evaluate determinants of serum 25-hydroxyvitamin D [25(OH)D] concentrations in a large cohort of postmenopausal women. Data from a subset of the Women's Health Initiative Observational Study were analyzed (50-79 y; n = 3345). Information on diet, lifestyle behaviors, secondhand smoke, use of dietary supplements and medication, chronic diseases, and anthropometry was collected at baseline (1993-1998) and on sun exposure at year 4 follow-up. Linear regression was performed to estimate regression coefficients (?). Significant determinants were total vitamin D intake (food plus supplements per 100 IU/d, ? = 2.08), years of supplemental vitamin D use (? = 0.15), total fat intake (grams per day, ? = -0.03), smoking status (? = -2.64, current vs. never), regional solar irradiance (? = 6.26, 475-500 vs. 300-325 Langleys), daylight time spent outdoors in summer (? = 5.15, >2 h vs. <30 min/d), recreational physical activity (metabolic equivalent task per hour per week, ? = 0.13), waist circumference (centimeters, ? = -0.26), and race/ethnicity (? = -11.94, black vs. white). Total vitamin D intake (partial R(2) = 0.09) explained the most variance in serum 25(OH)D concentrations (total R(2) = 0.29). The association between total vitamin D intake and serum 25(OH)D concentrations was stronger among participants who spent less rather than more daylight time outdoors in summer (P-interaction = 0.026). History and medications for hypertension, hyperlipidemia, and type 2 diabetes and secondhand smoke exposure were not associated with serum 25(OH)D. In conclusion, dietary factors and sun exposure remain important determinants of vitamin D status in postmenopausal women. Vitamin D intake should be emphasized for those with limited sun exposure.

Dataset Information

Vitamin D status and intake of lactating Inuit women living in the Canadian Arctic.

Objective

Design

Setting

Subjects

Results

Conclusions

Publications

Vitamin D status and intake of lactating Inuit women living in the Canadian Arctic.

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