scholarly journals Validation of a Vitamin D Specific Questionnaire to Determine Vitamin D Status in Athletes

Nutrients ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2732 ◽  
Author(s):  
D. Enette Larson-Meyer ◽  
Corey S. Douglas ◽  
Joi J. Thomas ◽  
Evan C. Johnson ◽  
Jacqueline N. Barcal ◽  
...  
Keyword(s):  
Vitamin D ◽  
Collegiate Athletes ◽  
Sun Exposure ◽  
Ultraviolet B ◽  
Food Record ◽  
Food Diary ◽  
Study Objective ◽  
Supplement Use ◽  
Vitamin D Intake ◽  
Tanning Bed

The study objective was to validate a food frequency and lifestyle questionnaire (FFLQ) to assess vitamin D intake and lifestyle factors affecting status. Methods: Data collected previously during the fall (n = 86), winter (n = 49), and spring (n = 67) in collegiate-athletes (Study 1) and in active adults (n = 123) (Study 2) were utilized. Study 1: Vitamin D intake and ultraviolet B exposure were estimated using the FFLQ and compared to serum 25(OH)D concentrations via simple correlation and linear regression modeling. Study 2: Vitamin D intake from food was estimated using FFLQ and compared to vitamin D intake reported in 7-Day food diaries via paired t-test and Bland–Altman analysis. Results: Study 1: Serum 25(OH)D was not associated with vitamin D intake from food, food plus supplements, or sun exposure, but was associated with tanning bed use (r = 0.39) in spring, supplement use in fall (r = 0.28), and BMI (body mass index) (r = −0.32 to −0.47) across all seasons. Serum 25(OH)D concentrations were explained by BMI, tanning bed use, and sun exposure in fall, (R = 0.42), BMI in winter (R = 0.32), and BMI and tanning bed use in spring (R = 0.52). Study 2: Estimated Vitamin D intake from food was 186.4 ± 125.7 via FFLQ and 148.5 ± 228.2 IU/day via food diary. There was no association between intake estimated by the two methodologies (r = 0.12, p < 0.05). Conclusions: FFLQ-estimated vitamin D intake was not associated with serum 25(OH)D concentration or food-record-estimated vitamin D intake. Results highlight the difficulty of designing/utilizing intake methodologies for vitamin D, as its status is influenced by body size and both endogenous and exogenous (dietary) sources.

scholarly journals Main sources and parental educational level differences in intake of vitamin D in Finnish preschool children

2020 ◽  
Vol 79 (OCE2) ◽  
Author(s):  
Essi Skaffari ◽  
Liisa Korkalo ◽  
Henna Vepsäläinen ◽  
Suvi Itkonen ◽  
Kaija Nissinen ◽  
...  
Keyword(s):  
Vitamin D ◽  
Preschool Children ◽  
Educational Level ◽  
Parental Education ◽  
Education Level ◽  
Food Record ◽  
Milk Products ◽  
Supplement Use ◽  
Vitamin D Intake ◽  
Fluid Milk

AbstractIn Finland the recommendation for the use of vitamin D supplement is a daily supplement throughout the year for all children. It is also recommended that fluid milk products and fat spreads are fortified with vitamin D. The purpose of this study was to provide up-to-date data on children's dietary and supplemental intake of vitamin D. We also examined educational level differences in the intake and sources of vitamin D.A cross-sectional study on the diet in Finnish 3–6-year-old preschool children (the DAGIS Study) was carried out in 2015–2016. Children were recruited in preschools in Southern Finland and in the Southern Ostrobothnia Region (n = 864). The parents reported child's supplement use (brand name, dose, frequency of use) during the last month and their own education level. The highest parental education level (PEL) was used in analysis. Parents and preschool personnel also filled in a 3-day food record for the child. A part of the families also kept an additional 2-day food record, which we sent to capture seasonal variation in the diet. In this analysis we included children (n = 794) with data for supplement use and at least 1-day food record. We calculated dietary intake based on the Fineli food composition database and created a dietary supplement database. We used Kruskal-Wallis test for statistical analysis.Most of the children in all PELs used vitamin D supplements (low 77%, medium 85%, high 85%). Dietary supplements covered almost half of the total intake in all groups (low 42%, medium 48%, high 47%, p = 0,087). The main dietary sources of vitamin D were fortified fluid milk products, fortified fat spreads and fish dishes. A higher proportion of vitamin D was obtained from fish dishes in families with higher PEL (low 4.3%, medium 4.5%, high 6.1%, p = 0.005), but otherwise there were no differences in the proportions of the main sources. The vitamin D intake from diet and supplements was lowest in families with low PEL but the total intake of vitamin D was adequate in all groups (low 18.3, medium 20.7, high 20.7 μg/day, p = 0.001).The use of vitamin D fortified fluid milk products and fat spreads and the vitamin D supplementation seem to ensure adequate vitamin D intake in all children, regardless the level of parental education.

scholarly journals Vitamin D deficiency during pregnancy and its associated factors among third trimester Malaysian pregnant women

2019 ◽  
Author(s):  
Fui Chee Woon ◽  
Yit Siew Chin ◽  
Intan Hakimah Ismail ◽  
Marijka Batterham ◽  
Amir Hamzah Abdul Latiff ◽  
...  
Keyword(s):  
Vitamin D ◽  
Pregnant Women ◽  
Vitamin D Deficiency ◽  
Associated Factors ◽  
Sun Exposure ◽  
Food Sources ◽  
Third Trimester ◽  
Supplement Use ◽  
Vitamin D Intake ◽  
Vitamin D Levels

AbstractBackgroundDespite perennial sunshine, vitamin D deficiency is prevalent among Malaysian especially pregnant women.ObjectiveTo determine the vitamin D status and its associated factors among third trimester pregnant women attending government health clinics in Selangor and Kuala Lumpur, Malaysia.MethodsInformation on socio-demographic characteristics, obstetrical history, vitamin D intake, supplement use, and sun exposure were obtained through face-to-face interviews. Serum 25-hydroxyvitamin D concentration was measured and classified as deficient (< 30 nmol/L), insufficient (30-50 nmol/L), and sufficient (≥ 50 nmol/L).ResultsOf the 535 pregnant women recruited, 42.6% were vitamin D deficient. They consumed an average of 8.7 ± 6.7 μg of vitamin D daily. A total of 80.4% of the vitamin D were obtained from the food sources, while 19.6% were from dietary supplements. Fish and fish products showed the highest contribution to vitamin D intake (35.8%). The multivariate generalized linear mixed models, with clinic as a random effect, indicates that higher intake of vitamin D is associated with lower risk of vitamin D deficiency among pregnant women (OR = 0.96; 95% CI = 0.93-0.99). Non-Malay pregnant women had lower odds of having vitamin D deficiency (OR = 0.13; 95% CI = 0.04-0.37) compared to Malays. No associations were found between age, educational level, monthly household income, work status, gravidity, parity, pre-pregnancy body mass index, total hours of sun exposure, total percentage of body surface area, and sun exposure index per day with vitamin D deficiency.ConclusionsVitamin D deficiency is prevalent among Malaysian pregnant women. Considering the possible adverse obstetric and fetal outcomes of vitamin D deficiency during pregnancy, antenatal screening of vitamin D levels and nutrition education should be emphasised by taking into consideration ethnic differences.

scholarly journals An Inter-Method Reliability Study Comparing Interview Information on Sunlight, Tanning Beds, Food, and Supplement Exposures with Serum 25-Hydroxy Vitamin D Levels

2020 ◽  
Author(s):  
Linda S. Cook ◽  
Xichen Li ◽  
Xin Grevers ◽  
Claire R. Pestak ◽  
Nigel Brockton ◽  
...  
Keyword(s):  
Vitamin D ◽  
Sun Exposure ◽  
Reliability Study ◽  
Serum Samples ◽  
Blood Draw ◽  
Supplement Use ◽  
Vitamin D Levels ◽  
Tanning Bed ◽  
25 Hydroxy Vitamin D ◽  
Supplement Intake

Abstract Background: We developed a questionnaire designed to capture the vitamin D related exposures of sunlight, tanning bed use, dietary intake, and supplement use, and used an inter-method reliability approach to compare the study method (self-reported information on vitamin D related exposures nearest the blood draw) with serum 25-hydroxy vitamin D (25(OH)D) levels. Methods: This inter-method reliability study included 512 control women from a population-based, case-control study in Alberta, Canada. All women self-reported data on food/supplement intake (average µg/day), sun exposure (cumulative hours/year), and tanning bed exposure (cumulative hours/year) and provided fasting serum samples, measured in duplicate with a DiaSorin immunoassay for 25(OH)D levels. The correlation between participant characteristics and 25(OH)D are described. We used multivariable robust regression to estimate the percent of variation in 25(OH)D explained by our variables of interest. Results: Food intake, sun exposure, and tanning bed exposure had positive and significant correlations with 25(OH)D levels of a similar magnitude (Spearman r= 0.17 to 0.19). Supplement intake (average µg/day, Spearman r= 0.44) had the strongest positive correlation. In both crude and adjusted models (adjusted for age, body mass index, race, smoking, oral contraceptive use, and menopausal status/hormone therapy), we consistently found that food explained 3.1%, supplements 18.9%, sunlight 2.2%, and tanning bed use 3.0% of the variation in 25(OH)D levels, and all variables combined explained 27.5% - 36.0% of the total variation. Conclusions: These results suggest that our comprehensive dietary and light exposure questionnaire may be a reasonable proxy measure of vitamin D status in the recent past when either 25(OH)D measurements or serum samples are not available for study participants.

scholarly journals Determinants of vitamin D status in pregnant fair-skinned women in Sweden

2013 ◽  
Vol 110 (5) ◽  
pp. 856-864 ◽  
Author(s):  
Petra Brembeck ◽  
Anna Winkvist ◽  
Hanna Olausson
Keyword(s):  
Vitamin D ◽  
Pregnant Women ◽  
Sun Exposure ◽  
Vitamin D Status ◽  
Negative Consequences ◽  
Food Diary ◽  
Third Trimester ◽  
Supplement Use ◽  
The Third ◽  
Northern Latitudes

Low maternal vitamin D status during pregnancy may have negative consequences for both mother and child. There are few studies of vitamin D status and its determinants in pregnant women living at northern latitudes. Thus, the present study investigates vitamin D status and its determinants during the third trimester of women living in Sweden (latitudes 57–58°N). A total of ninety-five fair-skinned pregnant women had blood taken between gestational weeks 35 and 37. The study included a 4 d food diary and questionnaires on dietary intake, supplement use, sun exposure, skin type, travels to southern latitudes and measure of BMI. Serum 25-hydroxyvitamin D (25(OH)D) was analysed using the chemiluminescence immunoassay. In the third trimester of pregnancy, mean serum concentration of 25(OH)D was 47·4 (sd18·1) nmol/l (range 10–93 nmol/l). In total, 65 % of women had serum 25(OH)D < 50 nmol/l and 17 % < 30 nmol/l. During the winter, 85 % of the pregnant women had serum 25(OH)D < 50 nmol/l and 28 % < 30 nmol/l. The main determinants of vitamin D status were as follows: season; use of vitamin D supplements; travels to southern latitudes. Together, these explained 51 % of the variation in 25(OH)D. In conclusion, during the winter, the majority of fair-skinned pregnant women had serum 25(OH)D < 50 nmol/l in their third trimester and more than every fourth woman < 30 nmol/l. Higher vitamin D intake may therefore be needed during the winter for fair-skinned pregnant women at northern latitudes to avoid vitamin D deficiency.

scholarly journals Vitamin D Intake from Supplemental Sources but Not from Food Sources Has Increased in the Canadian Population Over Time

2019 ◽  
Vol 150 (3) ◽  
pp. 526-535
Author(s):  
Hassan Vatanparast ◽  
Rashmi Prakash Patil ◽  
Naorin Islam ◽  
Mojtaba Shafiee ◽  
Susan J Whiting
Keyword(s):  
Vitamin D ◽  
Food Sources ◽  
Dietary Vitamin ◽  
Powdered Milk ◽  
Percentage Contribution ◽  
Supplement Use ◽  
Vitamin D Intake ◽  
Canadian Population ◽  
Usual Intake ◽  
Vitamin D Supplement

ABSTRACT Background Evidence is lacking to determine whether there have been any changes in dietary or total usual intakes of vitamin D among Canadians, in the light of recent evidence of beneficial health effects beyond bone. Objective We aimed to examine trends in dietary and total usual intake of vitamin D among Canadians aged ≥1 y. Methods This study used nationally representative nutrition data from the Canadian Community Health Survey Cycle 2.2 (CCHS 2004) and CCHS Nutrition in 2015. Dietary intake data were collected with use of two 24-h dietary recalls and dietary supplement use was determined by questionnaire. The National Cancer Institute method was used to estimate the usual intake of vitamin D as well as the prevalence of vitamin D inadequacy among Canadians aged ≥1 y. Results From 2004 to 2015, the usual intake of vitamin D from food significantly decreased (P &lt; 0.05) by 1 μg/d only in vitamin D supplement nonusers. The contribution of Milk and Alternatives food group (i.e., fluid milk, fortified soy beverages, powdered milk, and other milk alternatives) to dietary vitamin D intake significantly decreased (P &lt; 0.05) in both supplement users (by 7.1%) and nonusers (by 5.8%). Prevalence of vitamin D supplement use and percentage contribution of vitamin D from supplemental sources significantly increased (P &lt; 0.05) by 5.0% and 14.9%, respectively, from 2004 to 2015. Total usual intake of vitamin D (food + supplement) significantly increased (P &lt; 0.05) from 15.1 ± 0.3 μg/d in 2004 to 31.5 ± 1.8 μg/d in 2015 in vitamin D supplement users. In contrast to vitamin D supplement nonusers, the prevalence of vitamin D inadequacy significantly decreased (P &lt; 0.05) from 20.6% to 14.1% among users of vitamin D supplements. Conclusions The prevalence of vitamin D supplement use and the percentage contribution of vitamin D from supplemental sources has increased in the Canadian population over an 11-y period.

scholarly journals Nutrihealth Study: Seasonal Variation in Vitamin D Status Among the Slovenian Adult and Elderly Population

Nutrients ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1838 ◽  
Author(s):  
Maša Hribar ◽  
Hristo Hristov ◽  
Matej Gregorič ◽  
Urška Blaznik ◽  
Katja Zaletel ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Vitamin D Deficiency ◽  
Elderly Population ◽  
Sun Exposure ◽  
Epidemiological Data ◽  
The Elderly ◽  
Vitamin D Insufficiency ◽  
Ultraviolet B ◽  
Vitamin D Status

Several studies conducted around the world showed substantial vitamin D insufficiency and deficiency among different population groups. Sources of vitamin D in the human body include ultraviolet B (UVB)-light-induced biosynthesis and dietary intake, but people’s diets are often poor in vitamin D. Furthermore, in many regions, sun exposure and the intensity of UVB irradiation during wintertime are not sufficient for vitamin D biosynthesis. In Slovenia, epidemiological data about vitamin D status in the population were investigated through a national Nutrihealth study—an extension to the national dietary survey SI.Menu (2017/18). The study was conducted on a representative sample of 125 adult (18–64 years) and 155 elderly (65–74 years old) subjects, enrolled in the study in different seasons. Their vitamin D status was determined by measuring the serum 25-hydroxy-vitamin D (25(OH)D) concentration. Thresholds for vitamin D deficiency and insufficiency were 25(OH)D levels below 30 and 50 nmol/L, respectively. Altogether, 24.9% of the adults and 23.5% of the elderly were found to be vitamin D deficient, while an insufficient status was found in 58.2% and 62.9%, respectively. A particularly concerning situation was observed during extended wintertime (November–April); vitamin D deficiency was found in 40.8% and 34.6%, and insufficient serum 25(OH)D levels were observed in 81.6% and 78.8%, respectively. The results of the study showed high seasonal variation in serum 25(OH)D levels in both the adult and elderly population, with deficiency being especially pronounced during wintertime. The prevalence of this deficiency in Slovenia is among the highest in Europe and poses a possible public health risk that needs to be addressed with appropriate recommendations and/or policy interventions.

scholarly journals A Narrative Review of The Role of Foods as Dietary Sources of Vitamin D of Ethnic Minority Populations with Darker Skin: The Underestimated Challenge

Nutrients ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 81 ◽  
Author(s):  
Jing Guo ◽  
Julie A. Lovegrove ◽  
David I. Givens
Keyword(s):  
Vitamin D ◽  
Ethnic Minority ◽  
Ultraviolet B ◽  
Dietary Vitamin ◽  
Minority Populations ◽  
Vitamin D Status ◽  
Vitamin D Intake ◽  
Ethnic Minority Populations ◽  
Dietary Vitamin D ◽  
Lower Vitamin

In recent years, vitamin D deficiency has attracted attention worldwide. Especially many ethnic minority populations are considered at high-risk of vitamin D deficiency, owing to a lesser ability to synthesis vitamin D from sunlight (ultraviolet B), due to the skin pigment melanin and/or reduced skin exposure due to coverage required by religious and cultural restrictions. Therefore, vitamin D intake from dietary sources has become increasingly important for many ethnic minority populations to achieve adequate vitamin D status compared with the majority of the population. The aim of the study was critically evaluate the vitamin D intake and vitamin D status of the ethnic minority populations with darker skin, and also vitamin D absorption from supplements and ultraviolet B. Pubmed, Embaase and Scopus were searched for articles published up to October 2018. The available evidence showed ethnic minority populations generally have a lower vitamin D status than the majority populations. The main contributory food sources for dietary vitamin D intake were different for ethnic minority populations and majority populations, due to vary dietary patterns. Future strategies to increase dietary vitamin D intake by food fortification or biofortification needs to be explored, not only for the majority population but more specifically for ethnic minority populations who are generally of lower vitamin D status.

Determinants of Postpartum Vitamin D Status in the Caucasian Mother-Offspring Pairs at a Latitude of 52°N: A Cross-Sectional Study

2015 ◽  
Vol 67 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Justyna Czech-Kowalska ◽  
Dariusz Gruszfeld ◽  
Maciej Jaworski ◽  
Dorota Bulsiewicz ◽  
Julita Latka-Grot ◽  
...  
Keyword(s):  
Vitamin D ◽  
Cord Blood ◽  
Sun Exposure ◽  
Maternal Blood ◽  
Cross Sectional Study ◽  
Lower Percentage ◽  
Season Of Birth ◽  
Vitamin D Status ◽  
Cross Sectional ◽  
Vitamin D Intake

Background: High prevalence of vitamin D deficiency in pregnancy is recorded. Aim: To establish determinants of postpartum 25-hydroxyvitamin D (25(OH)D) levels on mothers and offspring. Methods: 25(OH)D level was measured in cord blood and maternal blood collected ≤3 weeks postpartum. Maternal socioeconomic status, vitamin D intake, sun exposure during pregnancy and maternal and neonatal fat mass (FM; dual X-ray absorptiometry) were assessed within 3 weeks postpartum. Results: A total of 174 mother-offspring pairs were enrolled. Maternal 25(OH)D <20 ng/ml was seen in 32 (51%) of summer and 82 (74%) of winter deliveries. Women with 25(OH)D <20 ng/ml had a 2-fold lower percentage of vitamin D intake of ≥800 IU/day than women with 25(OH)D ≥20 ng/ml (p = 0.02). FM (%) was comparable between groups (p > 0.05). Multiple regression analysis revealed the delivery season, prenatal vitamin D intake ≥800 IU/day and duration of supplementation to be the determinants of maternal 25(OH)D level (R2 = 0.26, p < 0.001). Maternal 25(OH)D level, season of birth and duration of maternal supplementation explained 83% of the variance in cord blood 25(OH)D level (R2 = 0.83, p < 0.001). Conclusions: The key determinants of higher maternal vitamin D status were the summer-autumn season of delivery and prenatal use of ≥800 IU/day of vitamin D. The cord blood 25(OH)D level was mainly determined by maternal 25(OH)D level and season of birth.

scholarly journals Peranan Ultraviolet B Sinar Matahari terhadap Status Vitamin D dan Tekanan Darah pada Wanita Usia Subur

2014 ◽  
pp. 256 ◽  
Author(s):  
Betty Yosephin ◽  
Ali Khomsan ◽  
Dodik Briawan ◽  
Rimbawan Rimbawan
Keyword(s):  
Blood Pressure ◽  
Vitamin D ◽  
Serum Vitamin ◽  
Sun Exposure ◽  
Ultraviolet B ◽  
P Value ◽  
Vitamin D Status ◽  
Women Of Childbearing Age ◽  
Childbearing Age ◽  
Anthropometric Parameter

Sinar ultraviolet B adalah sumber utama vitamin D, tetapi wanita usia subur yang bekerja di dalam ruangan mempunyai vitamin D yang rendah meskipun Indonesia negara tropis. Tujuan penelitian ini untuk mengevaluasi peranan paparan sinar matahari pada wanita usia subur terhadap status vitamin D dan tekanan darah. Desain penelitian yang digunakan adalah eksperimen tanpa kelompok kontrol pada 21 wanita sehat. Penelitian ini membandingkan status vitamin D dan tekanan darah sebelum dan setelah mendapat paparan sinar matahari pada wajah dan lengan tiga kali seminggu selama 12 minggu. Analisis data menggunakan uji t-berpasangan. Paparan sinar matahari dapat meningkatkan vitamin D. Serum 25(OH)D meningkat 15,9% dari 15.7 ng/dL menjadi 18,2 ng/dL. Paparan sinar matahari menurunkan tekanan darah sistolik (nilai p = 0,004) dan diastolik (nilai p = 0,011). Ultraviolet B dari sinar matahari 30 menit tiga kali seminggu selama 12 minggu dapat memperbaiki status vitamin D dan tekanan darah.Ultraviolet B sunlight exposure is a primary source of vitamin D, but women of childbearing age who worked in room every day had low serum vitamin D despite Indonesia is a tropical country. The objective of this study was to evaluate the role of sun exposure in women of childbearing age on vitamin D status, and blood pressure. An intervention before-after study without group control was conducted on 21 healthy women. This study compared vitamin D status, and blood pressure before and after receiving ultraviolet B (UVB) from sun exposure on the face and both arms three times a week for 12 weeks. Anthropometric parameter and blood pressure were measured, were determined at baseline and after 12 weeks of sun exposure. The effect of sun exposure can improve vitamin D. Serum 25 (OH)D increase 15.9% from 15.7 ng/dL to 18.2 ng/dL. Sun exposure significantly reduced systolic blood pressure (p value = 0.004), and diastolic blood pressure (p value = 0.011). Ultraviolet B from sun exposure for 30 minutes, 3 times a week for 12 weeks improves the vitamin D status, and blood pressure.

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