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vitamin D and sun

K Virecoulon Giudici, R M Fisberg, D M Lobo Marchioni, L Araújo Martini
BACKGROUND: Considering that lifestyle and diet are key factors responsible for the increases in adiposity in youth, it is important to understand how vitamin D, adipokines and markers of glucose metabolism are related to physical activity level (PAL) during growth. The present study aimed to investigate associations between physical activity level, adiponectin/leptin ratio, vitamin D status and dietary vitamin D intake among adolescents. METHODS: A cross-sectional study was conducted with adolescents aged 14-18 years old who were living in São Paulo, Brazil...
October 25, 2016: Journal of Human Nutrition and Dietetics: the Official Journal of the British Dietetic Association
A M M Vaes, E M Brouwer-Brolsma, N L van der Zwaluw, J P van Wijngaarden, A A M Berendsen, N van Schoor, N van der Velde, A Uitterlinden, P Lips, R A M Dhonukshe-Rutten, L C P G M de Groot
Various populations are at increased risk of developing a low vitamin D status, in particular older adults. Whereas sun exposure is considered the main source of vitamin D, especially during summer, dietary contributions should not be underestimated. This study aims to identify food sources of vitamin D that associate most strongly with serum vitamin D concentration. Data of 595 Dutch adults, aged ≥65 years, were analysed. Vitamin D intake was assessed with a food frequency questionnaire and 25-hydroxyvitamin D (25(OH)D) was determined in serum...
October 21, 2016: Journal of Steroid Biochemistry and Molecular Biology
Xiaoli Wang, Xiangyun Chang, Yurong Zhu, Huan Wang, Kan Sun
BACKGROUND: Vitamin D status is related to obesity-related metabolic disorders. We investigated the risk of 25-hydroxyvitamin D [25(OH)D] deficiency among different metabolic phenotypes. METHODS: This prospective cross-sectional study evaluated 1,292 individuals who were ≥40 years old. Participants were classified as metabolically healthy and normal weight (MHNW), metabolically obese but normal weight (MONW), metabolically healthy but obese (MHO) or metabolically unhealthy and obese (MUO)...
October 2016: American Journal of the Medical Sciences
Banu Bozkurt, Hasibe Artac, Hulya Ozdemir, Ali Ünlü, Mete Kaan Bozkurt, Murat Irkec
PURPOSE: To evaluate serum 25-hydroxyvitamin D [25(OH)D3] levels of vernal keratoconjunctivitis (VKC) children. METHODS: A total of 62 non-atopic healthy children (64.5% male, mean age 10.79 ± 3.3 years) and 29 VKC children (75.9%, mean age 12.17 ± 2.7 years) were included in the study. Serum 25(OH)D3 levels measured by HPLC were compared between the two groups and a p value of <0.05 was considered as statistically significant. RESULTS: The mean serum 25(OH)D3 level of VKC group was significantly lower than in the control group (11...
October 24, 2016: Ocular Immunology and Inflammation
L A Peterson, J K Canner, L J Cheskin, G P Prokopowicz, M A Schweitzer, T H Magnuson, K E Steele
OBJECTIVE: To investigate the association between adverse surgical outcomes following bariatric surgery and proxy measures of vitamin D (VitD) status (season and latitude) in the Nationwide Inpatient Sample (NIS). BACKGROUND: Obesity is an independent risk factor for VitD deficiency (25(OH)D < 20 ng ml(-1)). VitD deficiency compounds the chronic inflammation of obesity, increasing the risk of adverse outcomes following bariatric surgery. Epidemiology has long used season and latitude as proxies for group VitD, as VitD status is largely determined by sun exposure, which is greatest during summer and at the Equator...
December 2015: Obesity Science & Practice
Pang Yao, Liang Sun, Ling Lu, Hong Ding, Xiafei Chen, Lixin Tang, Xinming Xu, Gang Liu, Yao Hu, Yiwei Ma, Feijie Wang, Qianlu Jin, He Zheng, Huiyong Yin, Rong Zeng, Yan Chen, Frank B Hu, Huaixing Li, Xu Lin
CONTEXT: Little is known how genetic and non-genetic factors modify responses of vitamin D supplementation in nonwhite populations. OBJECTIVE: To investigate factors modifying 25-hydroxyvitamin D (25[OH]D) and bioavailable 25(OH)D (25[OH]DBio) responses after vitamin D3 supplementation. Design, Setting, Participants, and Intervention: In this randomized, double-blinded, placebo-controlled trial, 448 Chinese with vitamin D deficiency (25[OH]D<50 nmol/L) received 2000 IU/d vitamin D3 or placebo for 20 weeks...
October 21, 2016: Journal of Clinical Endocrinology and Metabolism
Ying Wang, Shaoyan Si, Junli Liu, Zongye Wang, Haiying Jia, Kai Feng, Lili Sun, Shu Jun Song
AIMS: Vitamin D deficiency has been associated with some disorders including cardiovascular diseases. Dyslipidemia is a major risk factor for cardiovascular diseases. However, data about the relationships between vitamin D and lipids are inconsistent. The relationship of vitamin D and Atherogenic Index of Plasma (AIP), as an excellent predictor of level of small and dense LDL, has not been reported. The objective of this study was to investigate the effects of vitamin D status on serum lipids in Chinese adults...
2016: PloS One
Mary Norval, Anna K Coussens, Robert J Wilkinson, Liza Bornman, Robyn M Lucas, Caradee Y Wright
In this review, reports were retrieved in which vitamin D status, as assessed by serum 25-hydroxyvitamin D [25(OH)D] levels, was measured in South African population groups with varied skin colours and ethnicities. Healthy children and adults were generally vitamin D-sufficient [25(OH)D level >50 nmol/L] but the majority of those aged above 65 years were deficient. A major role for exposure to solar ultraviolet radiation (UVR) in determining 25(OH)D levels was apparent, with the dietary contribution being minor...
October 18, 2016: International Journal of Environmental Research and Public Health
Chloe A Smith, Cong Sun, Angela Pezic, Christine Rodda, Fergus Cameron, Katie Allen, Maria E Craig, John Carlin, Terry Dwyer, Robyn M Lucas, Darryl W Eyles, Andrew S Kemp, Justine A Ellis, Anne-Louise Ponsonby
BACKGROUND: Vitamin D deficiency is linked to adverse childhood health outcomes, yet data on the distribution and quantifiable determinants of neonatal 25-hydroxyvitamin D3 (25OHD) concentration, a vitamin D biomarker, are limited. OBJECTIVE: Our aim was to identify determinants of neonatal 25OHD concentration, measured using neonatal dried blood spots (DBS). METHODS: A total of 259 ethnically diverse children aged 0-16 years born in Victoria, Australia, were recruited...
October 19, 2016: Neonatology
Corwin D Nelson, John D Lippolis, Timothy A Reinhardt, Randy E Sacco, Jessi L Powell, Mary E Drewnoski, Matthew O'Neil, Donald C Beitz, William P Weiss
The need for vitamin D supplementation of dairy cattle has been known for the better part of the last century and is well appreciated by dairy producers and nutritionists. Whether current recommendations and practices for supplemental vitamin D are meeting the needs of dairy cattle, however, is not well known. The vitamin D status of animals is reliably indicated by the concentration of the 25-hydroxyvitamin D [25(OH)D] metabolite in serum or plasma, with a concentration of 30 ng/mL proposed as a lower threshold for sufficiency...
October 13, 2016: Journal of Dairy Science
Jaroslaw Krzywanski, Tomasz Mikulski, Hubert Krysztofiak, Marcel Mlynczak, Ewa Gaczynska, Andrzej Ziemba
Vitamin D does not only influence the musculoskeletal health and mineral homeostasis but it also affects cardiovascular, endocrine, nervous, immune and mental functions, thus it is of considerable importance for both physically active people and elite athletes. However, vitamin D deficiency is common worldwide and results from inadequate endogenous skin synthesis (insufficient ultraviolet B exposure) and diet. To improve the vitamin D status elite athletes often travel to lower latitude during winter. The aim of the study was to evaluate the seasonal vitamin D status in Polish elite athletes according to the sun exposure and oral supplementation...
2016: PloS One
Ola Ahmed Bakry, Shawky M El Farargy, Maathir K El Shafiee, Amira Soliman
BACKGROUND: Alopecia areata (AA) is a common, recurrent, autoimmune hair disorder. It has been found that vitamin D deficiency is associated with many autoimmune diseases. AIMS: The current study aimed to estimate serum levels of 25-hydroxy vitamin D in patients with AA. MATERIALS AND METHODS: This case-control study included 60 patients with AA and 60 age, gender, skin phototype, and body mass index-matched healthy subjects as a control group...
September 2016: Indian Dermatology Online Journal
Khalil Salameh, Najah Saleh Ali Al-Janahi, Adriana M Reedy, Adekunle Dawodu
PURPOSE: Evaluation of vitamin D (vD) status and risk factors for low vD among breastfeeding mother-infant dyads in a population at high risk for vD deficiency. SUBJECTS AND METHODS: We measured serum 25-hydroxyvitamin D (25(OH)D) and parathyroid hormone at 1 month postpartum in 60 consecutive exclusively breastfeeding Arab mother-infant dyads enrolled in a high dose vD supplementation study to prevent vD deficiency in Doha, Qatar, (latitude 25°N) during summer months...
2016: International Journal of Women's Health
Yilong Shan, Sha Tan, Lei Zhang, Jianhua Huang, Xiaobo Sun, Yuge Wang, Wei Cai, Wei Qiu, Xueqiang Hu, Zhengqi Lu
Here, we investigated the relationship between serum 25-hydroxyvitamin D3 (25[OH]D3) levels and neuromyelitis optica spectrum disorder (NMOSD). Patients with NMOSD had lower 25(OH)D3 levels than healthy people, with lower levels in patients in the acute phase than those in remission. An inverse correlation was found between 25(OH)D3 and Expanded Disability Status Scale scores of patients during attacks. Higher serum 25(OH)D3 levels were associated with greater amelioration of symptoms during corticosteroid therapy...
October 15, 2016: Journal of Neuroimmunology
Jun Wang, Louise B Thingholm, Jurgita Skiecevičienė, Philipp Rausch, Martin Kummen, Johannes R Hov, Frauke Degenhardt, Femke-Anouska Heinsen, Malte C Rühlemann, Silke Szymczak, Kristian Holm, Tönu Esko, Jun Sun, Mihaela Pricop-Jeckstadt, Samer Al-Dury, Pavol Bohov, Jörn Bethune, Felix Sommer, David Ellinghaus, Rolf K Berge, Matthias Hübenthal, Manja Koch, Karin Schwarz, Gerald Rimbach, Patricia Hübbe, Wei-Hung Pan, Raheleh Sheibani-Tezerji, Robert Häsler, Philipp Rosenstiel, Mauro D'Amato, Katja Cloppenborg-Schmidt, Sven Künzel, Matthias Laudes, Hanns-Ulrich Marschall, Wolfgang Lieb, Ute Nöthlings, Tom H Karlsen, John F Baines, Andre Franke
Human gut microbiota is an important determinant for health and disease, and recent studies emphasize the numerous factors shaping its diversity. Here we performed a genome-wide association study (GWAS) of the gut microbiota using two cohorts from northern Germany totaling 1,812 individuals. Comprehensively controlling for diet and non-genetic parameters, we identify genome-wide significant associations for overall microbial variation and individual taxa at multiple genetic loci, including the VDR gene (encoding vitamin D receptor)...
October 10, 2016: Nature Genetics
Rocío N Villar-Quiles, Jordi A Matías-Guiu, Gloria Ortega, Inés González-Suárez, Celia Oreja-Guevara, Jorge Matías-Guiu
BACKGROUND: Some studies have suggested an association between the month of birth and risk of multiple sclerosis (MS), related to environmental factors, mainly sun exposure and maternal vitamin D levels. Few studies have been conducted in Southern Europe countries. Madrid has a continental climate with considerable variation of sun hours between winter and summer, so it may be relevant to study this relationship. METHODS: MS patients, born between 1932 and 2003, 1,335 of them from our database between 2004 and 2015, were analysed...
October 8, 2016: European Neurology
Diana Malaeb, Souheil Hallit, Pascale Salameh
Vitamin D inadequacy, frequently underdiagnosed, affects people of all age groups worldwide. This prospective study aims at determining the percentage of inadequate vitamin D levels among students and evaluating the impact of pharmacist counseling on raising the awareness of the importance of sun exposure and adequate vitamin D intake. A total of 160 university students were recruited. Blood samples were taken to check the vitamin D, calcium, and phosphorous levels. Vitamin D levels ⩽30ng/mL were defined as inadequate...
October 4, 2016: Journal of Epidemiology and Global Health
Evelien Backx, Cindy van der Avoort, Michael Tieland, Kamiel Maase, Arie Kies, Luc van Loon, Lisette de Groot, Marco Mensink
Studies monitoring vitamin D status in athletes are seldom conducted for a period of 12 months or longer, thereby lacking insight into seasonal fluctuations. The objective of the cur-rent study was to identify seasonal changes in total 25-hydroxyvitamin D (25(OH)D) concen-tration throughout the year. Fifty-two, mainly Caucasian athletes with a sufficient 25(OH)D concentration (>75 nmol/L) in June were included in this study. Serum 25(OH)D concentra-tion was measured every three months (June, September, December, March, June)...
October 6, 2016: International Journal of Sport Nutrition and Exercise Metabolism
Seong Hee Kim, Jae Ho Lee, Sun Yung Ly
BACKGROUND AND OBJECTIVES: Atopic dermatitis is one of the most common pediatric chronic inflammatory skin diseases, and certain food allergens and nutrients are closely related to the development and severity of atopic dermatitis. While avoidance of the causative foods is considered the mainstay of treatment, unverified excessive restriction might induce unnecessary limitations in the food intake, consequently leading to nutritional deficiencies and poor growth. This study aimed to identify the characteristics and nutrient intake status in children with atopic dermatitis and to investigate the effects of individualized nutrition intervention...
December 2016: Asia Pacific Journal of Clinical Nutrition
Ronghua Li, Meng Qiao, Xiaoyan Wang, Xintong Zhao, Qing Sun
BACKGROUND: The treatment of vitiligo is still one of the most difficult dermatological challenges, although there are many therapeutic options. Narrow band ultraviolet B (NB-UVB) phototherapy is considered to be a very important modality for generalized vitiligo. OBJECTIVE: The aim of this study was to explore whether a combination of NB-UVB and topical agents would be superior to NB-UVB alone for treating vitiligo. METHODS: We searched the electronic databases such as PUBMED, EMBASE, Cochrane Library and Web of Science...
October 1, 2016: Photodermatology, Photoimmunology & Photomedicine
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