Sunlight and dietary contributions to the seasonal vitamin D status of cohorts of healthy postmenopausal women living at northerly latitudes: a major cause for concern?

Macdonald, Helen; Mavroeidi, Alexandra; Fraser, William D.; Darling, A. L.; Black, Alison; Aucott, Lorna; O’Neill, Fiona; Hart, K.; Berry, Jacqueline; Lanham-New, Susan A; Reid, David M.

doi:10.1007/s00198-010-1467-z

Cited by 158 publications

(170 citation statements)

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“…Such an assumption can be drawn from the results of the study by Webb, Kline and Holick (1988) in which sunlight exposure was insufficient for vitamin D synthesis both in Boston (42.2°N) and Edmonton (52°N) from October to April [20]. On the other hand, in another study, a six degree latitude difference (Scotland, 51° and 57°) was associated with significant 25(OH)D concentration differences both in winter and summer [25].…”

Section: Prace Oryginalnementioning

confidence: 99%

Niedobór witaminy D w przeważająco miejskiej populacji dorosłych z Województwa Pomorskiego w miesiącach zimowych

Kmieć¹,

Żmijewski²,

Waszak³

et al. 2014

Endokrynologia Polska

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Introduction: Vitamin D is vital in the regulation of the calcium-phosphate metabolism, has a direct impact on the musculoskeletal system, and also affects numerous other systems. Widespread vitamin D deficiency and its detrimental effect on health have been reported globally. Data concerning vitamin D status in Polish adult population is scarce. Material and methods: Ambulatory patients of an outpatient clinic in Gdańsk were included in the study. Serum concentrations of 25(OH) D, parathyroid hormone (PTH), alkaline phosphatase (ALP), calcium and phosphorus were determined. In a questionnaire declared UVB exposure, dietary vitamin D and calcium intake, and health status of the subjects were assessed. Non-and parametric tests, logistic regression and population attributable risk were applied in data analysis. Results: 448 adults were examined from February to mid-April 2012, 305 women and 143 men, aged 19 to 86 (mean 46.3 ± 14.9 years). Mean 25-hydroxyvitamin D concentration was 14.3 ± 6.6 ng/mL. 84.4% of subjects were vitamin D deficient (25(OH)D < 20 ng/mL); 13.2% presented insufficient (20-30 ng/mL), and 2.5% (or 11 subjects) sufficient 25(OH)D concentrations. Significantly higher 25(OH)D concentrations were found in subjects who reported more UVB exposure, supplemented vitamin D orally and those who declared more physical activity. 21% of subjects had elevated serum PTH concentration (i.e. > 62 pg/mL); mean parathormone was 48.6 ± 25.2 pg/mL.

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Section: Prace Oryginalnementioning

confidence: 99%

Niedobór witaminy D w przeważająco miejskiej populacji dorosłych z Województwa Pomorskiego w miesiącach zimowych

Kmieć¹,

Żmijewski²,

Waszak³

et al. 2014

Endokrynologia Polska

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“…39 The Azorean Archipelago is located in the middle of the Northern Hemisphere of the Atlantic Ocean and extends along a west-northwest to east-southeast orientation (between 36.5-43° N and 24.5-31.5° W); therefore, the amount of ultraviolet-B radiation might be insufficient for synthesizing vitamin D. Nevertheless, it has been argued that in fall and winter, diet provided proportionally more vitamin D because of the lack of ultraviolet-B radiation. 40 In addition, limited exposure to sunlight due to cultural and lifestyle practice may also play a part in etiology of vitamin D deficiency. It is reported that in healthy Caucasian adolescent boys aged 16-18 years, there was a significant association between sports-related sun exposure and vitamin D status.…”

Section: Discussionmentioning

confidence: 99%

Vitamin D Intake and Cardiometabolic Risk Factors in Adolescents

Moreira

Abreu

et al. 2014

Metabolic Syndrome and Related Disorders

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Background: A growing body of research suggests that vitamin D might play an important role in overall health. No data exist on vitamin D intake for the Azorean adolescent population. The purpose of this study was to assess vitamin D intake and investigate a possible association between vitamin D intake and cardiometabolic risk factors in Azorean adolescents. Methods: A cross-sectional school-based study was conducted on 496 adolescents (288 girls) aged 15-18 years from the Azorean Islands, Portugal. Anthropometric measurements (waist circumference and height), blood pressure (systolic), and plasma biomarkers [fasting glucose, insulin, total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and triglycerides (TGs)] were measured to assess metabolic risk. Homeostasis model assessment (HOMA), TC-to-HDL-C ratio, and waist-to-height ratio were calculated. For each of these variables, a Z-score was computed by age and sex. A metabolic risk score was constructed by summing the Zscores of all individual risk factors. High risk was considered when the individual had ‡ 1 standard deviation (SD) of this score. Vitamin D intake was assessed with a semiquantitative food frequency questionnaire. Participants were classified into quartiles of vitamin D intake. Logistic regression was used to determine odds ratios for high cardiometabolic risk scores after adjusting for total energy intake, pubertal stage, fat mass percentage, and cardiorespiratory fitness. Results: Mean (SD) vitamin D intake was 5.8 (6.5) mg/day, and 9.1% of Azorean adolescents achieved the estimated average requirement of vitamin D (10 mg/day or 400 IU). Logistic regression showed that the odds ratio for a high cardiometabolic risk score was 3.35 [95% confidence interval (CI) 1.28-8.75] for adolescents in the lowest vitamin D intake quartile in comparison with those in the highest vitamin D intake quartile, even after adjustment for confounders. Conclusion: A lower level of vitamin D intake was associated with worse metabolic profile among Azorean adolescents.

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“…Biochemical Measurements: Fasting blood samples were collected and serum Vitamin D was measured by ELISA method 13 . Plasma glucose was measured by using Glucose oxidasePeroxidase (GOD-POD) method 14 , (Auto analyzerolympus AU-200), Insulin concentration was measured by using Fluorescent Enzyme Immuno Assay( FEIA) and Insulin resistance was calculated by using HOMA-IR (insulin(μg) glucose(mg) 15 .…”

Section: Bmi= Weight In Kg ------------------Height In Mmentioning

confidence: 99%

Untitled

2016

IJPSR

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Aim: To study the relationship between serum Vitamin D levels and insulin resistance in obese and non obese adolescents. Introduction: Vitamin D deficiency in obese adolescent is strongly associated with increased risk for diabetes, hyper tension and metabolic syndrome. Vitamin D insufficiency is a risk factor for developing impaired glucose in childhood obesity and is associated with insulin resistance in obese adolescents. In our study, we examined the relationship between Vitamin D and insulin resistance in obese adolescents. Materials and Methods: The study group included 50 obese adolescent aged (17-19 years) and compared with 50 age and gender matched healthy controls. Anthropometric data were collected and fasting plasma glucose was estimated by (GOD-POD) method, serum Insulin was estimated by (FEIA) method and insulin resistance was calculated by using (HOMA-IR) and serum Vitamin D was measured by using ELISA method. Results:The Vitamin D levels in obese adolescents is slightly lower than the controls. The insulin levels in obese adolescents is slightly higher than controls. Insulin resistance was significantly higher in subjects with higher BMI. We found by correlation analysis that HOMA-IR was dependent on degree of obesity and independent of Vitamin D level. Conclusion: The study concludes that in obese adolescents insulin resistance was affected more from BMI than Vitamin D levels. Lower concentration of Vitamin D is also a risk factor for developing insulin resistance independent of adiposity.

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Sunlight and dietary contributions to the seasonal vitamin D status of cohorts of healthy postmenopausal women living at northerly latitudes: a major cause for concern?

Abstract: These longitudinal data show significant regional and ethnic differences in UVB exposure and vitamin D status for postmenopausal women at northerly latitudes. The numbers of women who are vitamin D deficient is a major concern and public health problem.

Cited by 158 publications

References 46 publications

Niedobór witaminy D w przeważająco miejskiej populacji dorosłych z Województwa Pomorskiego w miesiącach zimowych

Niedobór witaminy D w przeważająco miejskiej populacji dorosłych z Województwa Pomorskiego w miesiącach zimowych

Vitamin D Intake and Cardiometabolic Risk Factors in Adolescents

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