Although low vitamin D status resulting from night work is a suspected cause of various health disorders, few studies have investigated the association between night-shift work and vitamin D status. Here, we examined serum 25-hydroxyvitamin D (25OHD) levels in 19 Japanese indoor workers, including night-shift workers, in blood samples collected at the annual medical checkup (late July) in a met...

BACKGROUND A large number of observational studies have reported harmful effects of low 25-hydroxyvitamin D (25OHD) levels on non-skeletal outcomes. We performed a systematic quantitative review on characteristics of randomized clinical trials (RCTs) included in meta-analyses (MAs) on non-skeletal effects of vitamin D supplementation. METHODS AND FINDINGS We identified systematic reviews (SR)...

OBJECTIVE Vitamin D deficiency in pregnancy is associated with an increased risk of gestational diabetes mellitus (GDM) and neonatal vitamin D deficiency. We conducted a double-blind, randomized controlled trial of low-dose (LD) versus high-dose (HD) vitamin D supplementation to investigate the effects of vitamin D supplementation on glucose metabolism during pregnancy. RESEARCH DESIGN AND ME...

Background Vitamin D status in groups of northern indigenous people of Russia leading close to traditional (seminomadic reindeer herding), post-traditional (in settlements) or "modernized" (in towns) way of life was analysed. Design The survey study groups consisted of 178 Nenets and Komi aged 18-60 living in the Arctic (66-67°N). Urban Komi, Udmurts and Komi-Permiaks (n=150) living in a non-Ar...

AIMS To determine the prevalence of hypovitaminosis D among healthy adolescent schoolgirls attending an inner city multiethnic girls' school. METHODS Fifty one (28%) of 182 girls (14 white, 37 non-white; median age 15.3 years, range 14.7-16.6) took part in the study. Biochemical parameters, dietary vitamin D intake, muscle function parameters, duration of daily sunlight exposure (SE), and per...

Calcium absorption by the intestine is necessary for bone mineralization. Much has been learned about this process and the role of vitamin D metabolites in gene transcription from animal studies, but the molecular mechanisms in humans are less well understood. We have used samples of normal human duodenal mucosa, obtained at endoscopy, to investigate the effects of the vitamin D metabolites, 1a...

BACKGROUND Although vitamin D deficiency has been documented as a frequent problem in studies of young adults, elderly persons, and children in other countries, there are limited data on the prevalence of this nutritional deficiency among healthy US teenagers. OBJECTIVE To determine the prevalence of vitamin D deficiency in healthy adolescents presenting for primary care. DESIGN A cross-sec...

BACKGROUND Little is known of vitamin D concentration in cerebrospinal fluid (CSF) in Alzheimer's disease (AD) and its relation with CSF acetylcholinesterase (AChE) activity, a marker of cholinergic function. METHODS A cross-sectional study of 52 consecutive patients under primary evaluation of cognitive impairment and 17 healthy controls. The patients had AD dementia or mild cognitive impair...

Abstract Evaluation of digital ELISA using a high-resolution computational optical system for measurement total 25-hydroxyvitamin D Background Biomarkers such as vitamin occur at very low concentrations in blood, and sensitive detection methods are required order to measure them. It is difficult accurately low-concentration biomarkers conventional enzyme-linked immunosorbent assays (ELISA) with...

OBJECTIVE To assess the serum level of 25 hydroxyvitamin D 25OHD among healthy Saudi Arabian women living in the eastern province. METHODS A cross-sectional randomized study was conducted between February 1st 2008 and May 31st 2008 at the King Fahd University Hospital, Al-Khobar, Kingdom of Saudi Arabia in 200 Saudi women between 25-35 years group 1 and women of > or =50 years group 2. Clinic...