scholarly journals Dietary vitamin D intake among university students and their habits concerning daily sunlight exposure – a cross-sectional study

2021 ◽  
Vol 57 (4) ◽  
pp. 396-406
Author(s):  
Gordana Kenđel Jovanović ◽  
Greta Krešić ◽  
Sandra Pavičić Žeželj
Keyword(s):  
Vitamin D ◽  
University Students ◽  
Diet Quality ◽  
Sunlight Exposure ◽  
Food Sources ◽  
Dietary Vitamin ◽  
Physically Active ◽  
Vitamin D Intake ◽  
Anti Inflammatory ◽  
Dietary Vitamin D

Aim: To evaluate students’ dietary vitamin D intake according to characteristics and habits concerning daily sunlight exposure. Methods: The study included 403 students of the University of Rijeka, Croatia that fulfilled questionnaire about their characteristics, habits, physical activity, supplement use, diet, and their daily sunlight exposure. For assessing diet quality, the Dietary inflammatory index (DII®) was used. Results: Average dietary vitamin D intake was 2.76 μg/day, statistically highest among men (p<0.01), medical sciences universities’ students (p<0.01), students with obesity (p=0.03), highly physically active (p=0.02) and smokers (p=0.01). Major dietary vitamin D sources were fish (42%, p<0.01) and meat and meat products (31%). Students that more frequently expose themselves to the sunlight were mostly men, overweight, moderately physically active, dietary supplements users, and had a diet with more anti-inflammatory potential, higher dietary vitamin D intake and its major dietary sources. Those who rarely and never used a sunscreen had a more anti-inflammatory diet and higher vitamin D and its major food sources intakes. Diet with more pro-inflammatory potential had students that rarely or never directly expose themselves to the sunlight, likewise the students that frequently used sunscreen. Those subgroups also had the lowest dietary vitamin D intake. Conclusions: The average dietary vitamin D intake by investigated university students satisfied only the fifth of the recommended daily vitamin D intake. Students with habits that can influence the lower synthesis of vitamin D may increase the risk of diseases related to bone health, immunity and inflammation in their future life. Provided results about students’ habits of their exposure to the sunlight might be useful for public health messages toward sufficient sunlight exposure, diet quality with more anti-inflammatory potential, vitamin D supplements use, and vitamin D deficiency prevention.

scholarly journals Vitamin D Intake among Premenopausal Women Living in Jeddah: Food Sources and Relationship to Demographic Factors and Bone Health

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Tahani A. Zareef ◽  
Robert T. Jackson ◽  
Abdulkareem A. Alkahtani
Keyword(s):  
Vitamin D ◽  
Lumbar Spine ◽  
Dairy Products ◽  
Premenopausal Women ◽  
Food Sources ◽  
Dietary Vitamin ◽  
Saudi Women ◽  
Vitamin D Intake ◽  
Femur Neck ◽  
Dietary Vitamin D

Background. Saudi women depend on food sources to maintain their serum 25(OH) D concentrations because covering by traditional clothing and time spent indoors limit their sun exposure. Little is known about vitamin D intake and its main food sources in Saudi Arabia. In addition, the association between vitamin D and calcium intake and bone mineral density (BMD) in young women is not well researched.Objectives. To assess the adequacy of vitamin D intake among Saudi women as compared to the estimated average requirements (EARs), to identify dietary vitamin D sources, to examine potential determinants of vitamin D intake, and to assess bone health and the association of calcium and vitamin D intake with BMD.Methods. This cross-sectional study was conducted in 257 premenopausal women aged 20–50 years in Jeddah, Saudi Arabia. Dietary vitamin D and calcium were assessed by the Semiquantitative Food Frequency Questionnaire. BMD was measured using dual-energy X-ray absorptiometry (DXA) in a subset of womenn=102at the lumbar spine and femur neck.Results. Sixty-five percent of women were below the EAR for vitamin D, and 61% fell below the EAR for calcium. Dairy products, supplements, and fish contributed most to vitamin D intake. Increased age was an independent determinant of sufficient vitamin D intakep<0.001. The prevalence of osteopenia was 33% in the lumbar spine and 30% in the femur neck. There was a significant positive association between calcium intake and BMD at the lumbar spinep=0.043after controlling for body mass index and energy intake. Vitamin D intake was not significantly different between women with low and normal bone mass.Conclusion. Premenopausal women in Jeddah have insufficient vitamin D and calcium intakes. Public health strategies to improve nutrition in young women are needed, and expanding fortification programs to include all dairy products would be useful.

scholarly journals Vitamin D status and dietary intake in young university students in the UK

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Honglin Dong ◽  
Viktorija Asmolovaite ◽  
Nareen Marseal ◽  
Maryam Mearbon
Keyword(s):  
Vitamin D ◽  
University Students ◽  
Dietary Intake ◽  
Vitamin D Deficiency ◽  
Dietary Vitamin ◽  
Small Scale ◽  
Vitamin D Status ◽  
Content Type ◽  
Vitamin D Intake ◽  
Dietary Vitamin D

Purpose Vitamin D deficiency is prevalent worldwide. This paper aims to investigate the vitamin D status and dietary intake in young university students. Design/methodology/approach Forty-one healthy students aged 18–29 years from Coventry University UK were recruited during January-February 2019, including white Caucasians (n = 18), African-Caribbeans (n = 14) and Asians (n = 9). Plasma 25(OH)D concentrations were measured and dietary vitamin D intake was determined. Chi-square and simple linear regression were used to analyse the data. Findings The plasma 25(OH)D concentrations were (36.0 ± 22.2) nmol/L in all subjects, (46.5 ± 25.3) nmol/L in white Caucasians, (22.6 ± 7.4) nmol/L in African-Caribbeans and (37.4 ± 21.7 nmol/L) in Asians. The majority (85.7%) of African-Caribbeans were vitamin D deficient compared with 22.2% of white Caucasians and 33.3% of Asians (p = 0.001). Overweight/obese subjects showed a significant higher proportion of vitamin D deficiency (65%) than normal weight subjects (28.6%) (p = 0.04). The average dietary vitamin D intake in all subjects was (4.6 ± 3.9) µg/day. Only 12.1% of the subjects met the recommended dietary vitamin D intake of 10 µg/day. Dietary vitamin D intake (p = 0.04) and ethnicity (p = 0.01) were significant predictors of 25(OH)D levels and accounted for 13% and 18.5% of 25(OH)D variance, respectively. Research limitations/implications This small-scale study showed an alarmingly high prevalence of vitamin D deficiency among subjects from African-Caribbean origin during wintertime. Education programs and campaigns are urgently needed to fight the vitamin D deficiency in this population. Originality/value The targeted population were in a critical period of transition from adolescence toward adulthood involving in changes in behaviours and nutrition.

scholarly journals Dietary vitamin D intake and food sources of US and Canadian population

2010 ◽  
Vol 24 (S1) ◽  
Author(s):  
Satya S Jonnalagadda ◽  
Ann M. Albertson ◽  
Nandan Joshi ◽  
Kathy Moore ◽  
Bhavna Sharma ◽  
...  
Keyword(s):  
Vitamin D ◽  
Food Sources ◽  
Dietary Vitamin ◽  
Vitamin D Intake ◽  
Canadian Population ◽  
Dietary Vitamin D

scholarly journals Knowledge, Attitude and Practice Related to Vitamin D and Its Relationship with Vitamin D Status among Malay Female Office Workers

2019 ◽  
Vol 16 (23) ◽  
pp. 4735 ◽  
Author(s):  
Nor Aini Jamil ◽  
Nurul Nadiah Shahudin ◽  
Nur Surfina Abdul Aziz ◽  
Chew Jia Qi ◽  
Wan Az Aleesa Wan Aminuddin ◽  
...  
Keyword(s):  
Vitamin D ◽  
Sunlight Exposure ◽  
Office Workers ◽  
Dietary Vitamin ◽  
Vitamin D Status ◽  
Serum 25Ohd ◽  
Vitamin D Intake ◽  
Attitude And Practice ◽  
Dietary Vitamin D ◽  
Knowledge Attitude And Practice

This study assessed knowledge, attitude and practice (KAP) related to vitamin D and its relationship with vitamin D status among Malay female office workers. A total of 147 women aged between 20 and 55 years were recruited from a university in Kuala Lumpur. They answered questionnaires related to KAP on vitamin D, sun exposure, dietary vitamin D intake and physical activity. Serum 25-hydroxyvitamin D (25OHD) was analysed using an enzyme-linked immunoassay. Nearly half (45%) of the subjects had good knowledge but moderate attitude (76%) and practice (84%) towards sunlight exposure and dietary vitamin D intake. Median serum 25OHD was 34.1 nmol/L with the majority (91%) had vitamin D insufficiency (25OHD < 50 nmol/L). Knowledge was weakly associated with attitude (r = 0.29, p < 0.001) but no association was found between knowledge and practice (r = 0.08, p = 0.355) nor attitude and practice (r = −0.001, p = 0.994). Serum 25OHD was positively associated with sunlight exposure (r = 0.22, p = 0.008) and dietary vitamin D intake (r = 0.37, p < 0.001). It can be implied that this group is at increased risk of low bone health status, which highlights the needs of public health campaigns to improve their vitamin D status.

scholarly journals Relationship between dietary vitamin D and serum 25-hydroxyvitamin D levels in Portuguese adolescents

2017 ◽  
Vol 21 (2) ◽  
pp. 325-332
Author(s):  
Maria Cabral ◽  
Joana Araújo ◽  
Carla Lopes ◽  
Henrique Barros ◽  
João Tiago Guimarães ◽  
...  
Keyword(s):  
Vitamin D ◽  
Food Sources ◽  
Dietary Vitamin ◽  
Cross Sectional ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
Significant Difference ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D ◽  
Portuguese Adolescents

AbstractObjectiveTo understand the relationship between vitamin D intake and serum 25-hydroxyvitamin D (25(OH)D) levels in a sample of Portuguese adolescents.DesignCross-sectional evaluation carried out in the 2003/2004 school year. Vitamin D intake was assessed by an FFQ and 25(OH)D was measured in a fasting blood sample.SettingPublic and private schools in Porto, Portugal.SubjectsAdolescents aged 13 years (n 521) enrolled at school (EPITeen cohort).ResultsBoth mean (sd) intake and serum 25(OH)D level were far below the recommended, 4·47 (2·49) µg/d and 16·5 (5·7) ng/ml, respectively. A significant difference in serum level was found according to season, with lower values in winter than summer (14·8 (4·6) v. 17·3 (5·9) ng/ml, P<0·001). Vitamin D intake was weakly correlated with serum 25(OH)D (r=0·056, P=0·203).ConclusionsDietary vitamin D and serum 25(OH)D levels were positively but weakly correlated and the error was higher among those with higher serum 25(OH)D concentration. Our results support the need for strategies that promote increase of the most important food sources of vitamin D to reduce the high prevalence of low vitamin D status.

Association of vitamin D with incident glaucoma: findings from the Women’s Health Initiative

2021 ◽  
pp. jim-2020-001645
Author(s):  
Laura D Carbone ◽  
Karen Johnson ◽  
Joseph C Larson ◽  
Fridtjof Thomas ◽  
Jean Wactawski-Wende ◽  
...  
Keyword(s):  
Vitamin D ◽  
Women's Health ◽  
Postmenopausal Women ◽  
Serum Levels ◽  
Dietary Vitamin ◽  
Health Initiative ◽  
Vitamin D Intake ◽  
Vitamin D Supplements ◽  
Dietary Vitamin D ◽  
The Women’S Health Initiative

The relationship between vitamin D and glaucoma is controversial. The objective of this study was to examine women from the Women’s Health Initiative (WHI) to determine if there is an association between vitamin D and incident glaucoma in postmenopausal women. We examined the association between dietary vitamin D intake, vitamin D supplements and serum 25 hydroxyvitamin D (25(OH)D) levels and the risk of developing glaucoma. 143,389 postmenopausal women from the WHI including a subset with serum 25(OH) D measurements were examined to determine the association of dietary, supplemental and serum levels of vitamin D to the development of glaucoma. Dietary intakes of vitamin D, use of vitamin D supplements and serum levels of 25(OH) D were predictors examined for the main outcome of incident glaucoma. In multivariable models adjusted for demographic, clinical variables and medication use, dietary vitamin D, vitamin D supplements, total vitamin D intake (diet plus supplements) and serum 25 (OH) D measurements were not significantly associated with incident glaucoma. In the CaD placebo-controlled intervention clinical trial, there was also no association in the active intervention arm with glaucoma. We conclude that dietary vitamin D intake, supplements and serum levels are not significantly related to the risk of developing glaucoma in postmenopausal women.

scholarly journals High Prevalence of Vitamin D Inadequacy During Late Postpartum in Canadian Mothers

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 790-790
Author(s):  
Sarah Montgomery ◽  
Angella Lee ◽  
Nasime Sarbar ◽  
Deborah Zibrik ◽  
Yvonne Lamers
Keyword(s):  
Vitamin D ◽  
British Columbia ◽  
Dietary Intake ◽  
Dietary Vitamin ◽  
Nutrient Deficiencies ◽  
Cross Sectional ◽  
Convenience Sample ◽  
Vitamin D Intake ◽  
Pregnancy And Postpartum ◽  
Dietary Vitamin D

Abstract Objectives To assess maternal dietary intake and adequacy at postpartum and to determine whether lifestyle characteristics and breastfeeding status are related to nutrient intakes. Methods We analyzed cross-sectional data from a convenience sample of 129 mothers at 18-mo postpartum, whose families were enrolled into a randomized toddler intervention trial, in the Lower Mainland, British Columbia, Canada. The Canadian Diet History Questionnaire II (C-DHQ II) was used to estimate usual dietary intake in the mothers during the preceding 12 months (i.e., between 6- to 18-mo postpartum). Implausible energy intakes were defined as &lt;600 kcal/day or &gt;3500 kcals/day, and excluded from analysis. Demographic and lifestyle characteristic data about the pregnancy and postpartum time period were collected using a questionnaire. Results Maternal mean (SD) age at birth was 33.5 (4.0) years and most women were of European (46%) or Asian (38%) ethnicity, and had Bachelor's degree or higher education (70%). About 75%, 88%, and 89% did not meet their dietary requirements (i.e., intake below the EAR) for fiber, potassium, and vitamin D intakes, from food only, respectively. Considering total dietary intake from food and supplements, the prevalence of dietary vitamin D inadequacy was 25%. Women of European ethnicity had higher vitamin D intake (median (IQR) in mg/1000kcal/day: 19.5 (7.26,101)) compared to Asian women (10.8 (3.87, 21.1); P &lt; 0.05). Dietary vitamin D intake was higher in breastfeeding (i.e., providing breastmilk as primary milk source, i.e., ³2 times/day, to their 18-mo old toddlers) compared to non- or occasionally breastfeeding mothers (20.0 (10.5, 61.1) versus 14.9 (4.28, 26.7) mg/1000kcal/day; P &lt; 0.05). Conclusions While most Canadian mothers in this sample met the EARs for most nutrients, the prevalence of dietary inadequacy was very high for vitamin D, potassium, and fiber. Some population groups may be especially at risk of developing nutrient deficiencies in this period of life characterized by postpartum recovery and transition; targeted public health strategies may be needed to address these deficiencies. Funding Sources This study is supported by The University of British Columbia, and the British Columbia Children's Hospital Research Institute, Canada, and is funded by Société des Produits Nestlé S.A.

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