To evaluate if dietary vitamin D intake is adequate for sufficient vitamin D status during early winter in children living in Sweden, irrespective of latitude or skin color.
As part of a prospective, comparative, 2-center intervention study in northern (63°N) and southern (55°N) Sweden, dietary intake, serum 25-hydroxyvitamin D (S-25(OH) D), associated laboratory variables, and sociodemographic data were studied in 5 to 7-year-old children with fair and dark skin in November and December.
Two hundred six children with fair/dark skin were included, 44/41 and 64/57 children in northern and southern Sweden, respectively. Dietary vitamin D intake was higher in northern than southern Sweden (P?=?0.001), irrespective of skin color, partly due to higher consumption of fortified foods, but only met 50-70% of national recommendations (10 µg/day). S-25(OH) D was higher in northern than southern Sweden, in children with fair (67 vs 59 nmol/L; P?
Serum vitamin D has recently been inversely associated with risk for type 2 diabetes. Recent literature suggests that many more individuals than generally thought suffer from vitamin D deficiency. Southeast Alaskan Natives are at an increased risk due to limited sunlight exposure and possible inadequate vitamin D intake. Therefore, the relationship between vitamin D and glucose should be investigated specifically in the southeast Alaska Native population. A review of lab records yielded 83 charts of patients found to have a serum 25-hydroxyvitamin D during a 2-year period. Upon review of these charts, only nine of 83 vitamin D levels were found to exceed the 32 ng/mL (80 nmol/L) threshold. Age and vitamin D levels were associated in a positive linear relationship (r=0.354, P=0.028). The patients in the lowest vitamin D quartile were younger in age compared to the highest quartile (14.6 years, 95% confidence interval: 4.9, 24.29; P=0.004). The high rate of deficiency noted in this sample suggests this population should be further assessed for vitamin D deficiency. Future studies are needed to confirm the association between a vitamin D deficiency and diabetes incidence in this population.
Low vitamin D levels have been associated with obesity and living in areas that lack sunshine, such as northern Europe. The aim of this study was to investigate the vitamin D status of a group of obese children in Sweden and to investigate the associations between vitamin D status and markers of glucose metabolism and metabolic risk markers.
This was a prospective cross-sectional study of 202 obese children between 4.5 and 17.9 years of age who had been referred to the National Childhood Obesity Centre at Karolinska University Hospital, Stockholm. We examined age, gender, 25-hydroxyvitamin D (25(OH)D), f-glucose, f-insulin and metabolic risk markers. Vitamin D deficiency was defined as less than 30 25(OH)D nmol/L. Children with and without a vitamin D deficiency were compared.
Just over a third (33.2%) of our study population had vitamin D levels
Cites: Int J Obes (Lond). 2012 Mar;36(3):387-9621694701
Cites: N Engl J Med. 2007 Jul 19;357(3):266-8117634462
OBJECTIVE: To assess vitamin D status and the impact of three fish meals consisting of cod liver and fresh cod-liver oil on the plasma level of vitamin D metabolites in an area with high consumption of cod liver and cod-liver oil. DESIGN: Experimental field study. METHODS: Thirty-two volunteers from the Skjervøy (70 degrees N) municipality in northern Norway were recruited to consume three traditional mølje meals, consisting of cod, cod liver, fresh cod-liver oil and hard roe, in one week. The liver and fresh cod-liver oil consumed by the participants were weighed and recorded. Blood samples were collected before the first meal, and subsequently 12 h and 4 days after the last meal. The blood samples were analysed for the vitamin D metabolites 25-hydroxyvitamin D (25(OH)D) and 1,25-dihydroxyvitamin D (1,25(OH)2D). All participants answered a semi-quantitative food-frequency questionnaire, which was used to estimate usual daily nutrient intake. The study was carried out in the last part of March 2001. RESULTS: The median daily vitamin D intake estimated from the questionnaire was 9.9 microg. The proportion of subjects with baseline 25(OH)D level below 50 nmol l(-1) was 15.4% and none were below 37.5 nmol l(-1). Only "mølje consumption" and "time spent in daylight" were significantly associated with baseline log 25(OH)D. The mean total intake of vitamin D in the three servings was 272 microg (standard deviation 94 microg), ranging from 142 to 434 microg. Relative to baseline plasma concentration, the mean level of 25(OH)D decreased slightly in both post-consumption samples (P
Vitamin D deficiency and insufficiency are prevalent worldwide, but relatively few studies have examined vitamin D status in working populations.
To assess the prevalence of vitamin D deficiency and insufficiency in Canadian workers and investigate risk factors in this population.
A cross-sectional study using data from a health programme enrolling workers mostly from Northern Alberta, Canada. As part of the programme, volunteers were invited to complete a lifestyle questionnaire. Blood was taken to determine plasma 25-hydroxyvitamin D (25(OH)D) levels. Logistic and linear regressions were used to investigate the relationships between individual characteristics and vitamin D status.
Between October 2007 and December 2012, 6101 eligible workers enrolled in the health programme. The prevalence of vitamin D deficiency (plasma 25(OH)D, levels