The status of biochemical parameters in varying degrees of vitamin D deficiency.
ABSTRACT Vitamin D (Vit D) is an essential element for the regulation of serum calcium, phosphate, and alkaline phosphatase (Alk Ph). Because the Vit D serum level is not usually measured directly, Vit D deficiency is diagnosed indirectly by changes in serum calcium, phosphate, and Alk Ph leves. The current study assessed the status of these biochemical parameters in subjects with different degrees of Vit D deficiency. We selected 1,210 subjects, between 20 and 69 years old, randomly from the Tehran population. Subjects with diseases or medications that modified bone metabolism were excluded from the study. Serum 25(OH) D, calcium, phosphate, Alk Ph, and parathyroid hormone (PTH) levels were measured and the status of these biochemical parameters was compared in subjects with different degrees of Vit D deficiency. Vit D deficiency was diagnosed in 79.6% of the subjects. Different degrees of Vit D deficiency were classified as follows: group 1, severe; group 2, moderate; and group 3, mild. Serum PTH levels in the Vit D-deficient groups were significantly higher than that in group 4 (normal Vit D). Serum calcium and phosphate levels in groups 1 and 2 were significantly lower than those in groups 3 and 4. No significant difference was seen in serum Alk Ph in the groups with different degrees of Vit D deficiency. The sensivity for at least one biochemical variable (calcium, phosphorus, or Alk Ph) for the detection of severe, moderate, and mild Vit D deficiency was 24.2%, 13.8%, and 6%, respectively. When the serum 25(OH) D level was reduced to less than 25 nmol/l (groups 1 and 2), the effects of Vit D deficiency on calcium and phosphate levels were obvious. Therefore, the usual biochemical parameters (calcium, phosphate, Alk Ph) alone do not have sufficient sensitivity to detect mild deficiency of Vit D.
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ABSTRACT: Background and the purpose of the study: There are increasing evidences about relationship between vitamin D metabolism and occurrence of diabetes mellitus. Vitamin D has a role in secretion and possibly the action of insulin and modulates lipolysis and might therefore contribute to the development of the metabolism. The aim of this study was to investigate the nature and strength of the association between vitamin D concentration and the metabolic syndrome (MS) in Iranian population. Methods: A cross-sectional study was conducted on 646 healthy population who had no history of diabetes. The MS was defined according to WHO criteria. The concentrations of vitamin D, and parathyroid hormone (PTH) were also measured. Results and major conclusion: Of the total 646 participants, the unadjusted prevalence of the MS was 18.3% (29% in men and 14.6% in women). The total prevalence of vitamin D deficiency was 72.3%. Amongst the men with vitamin D deficiency the prevalence of the MS was higher than those with normal vitamin D (p=0.03). In the logistic regression model, after age and sex adjustment, vitamin D deficiency predicted independently the metabolic syndrome (p=0.001). Vitamin D deficiency and the MS have a high prevalence among Iranian adult population. The finding of this investigation revealed that vitamin D deficiency may have an important role in metabolic syndrome and its components.
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ABSTRACT: Because of increase in elderly population, osteoporosis appears to become as a major public health issue in developing countries as in Iran. In order to obtain a clearer picture of osteoporosis in Iran, studies on different aspect of osteoporosis especially national projects about epidemiology and burden of disease, are required. Coordinating research programs is pos- sible only by establishing a research network, so the national osteoporosis research network was suggested by Endocrinol- ogy and Metabolism Research of Tehran University of Medical Sciences. Iranian Osteoporosis Research Network (IORN) was established in 2002 by approval of Deputy for Research and the National Advisory Committee on Non-communicable Diseases of Ministry of Health and Medical Education of Iran. At first, five centers of Medical Sciences Universities and Research Centers in addition to the EMRC, participated in this project. Gradually more centers joined to the network and the numbers of IORN members are now 41 persons from 21 universities and research centers. IORN has had several activi- ties: 1) Research projects, from among them are Iranian Multi-center Osteoporosis Study (IMOS) and Hip Fracture Registry Project (HFRP) in Iran 2) Educational activities with the aim of preventing osteoporosis and its related fractures 3) Establishment of osteoporosis clinic. In summery osteoporosis is an important public health issue especially in developing countries be- cause of increasing in elderly population. Close relationship between academic and research centers through the IORN mem- bership provided possibility of designing and applying national research projects on epidemiology and burden of osteoporosis.
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ABSTRACT: This study aimed to investigate dietary supplement use among Iranian adults in northern Iran. A cross-sectional study was undertaken on randomly selected men and women in Guilan province, northern Iran. The study population was parents of children and adolescents studying in schools. Totally, 1,425 women and 676 men were studied and data on age, body weight, height, educational level, and supplement use was gathered using a self-administrated questionnaire. These data showed that supplement use was related to sex, body mass index, and educational levels in both sexes. Most common supplements used in this population were Iron, calcium, multivitamin/multiminerals and fish oils. These results showed that 13.3, 3.4, 2.2, and 1.1 % of the study men used iron, calcium, multivitamin/multimineral, and fish oil, respectively. In women, 27.1, 10.7, 5.1, and 5.5 % used Iron, calcium, multivitamin/multimineral, and fish oil, respectively. More educated men and women and those with more healthy weight were more likely to use any dietary supplement than the less educated and overweight/obese men and women. This study showed that iron was the most common dietary supplement in this study middle aged Iranians. Using the other supplements was mostly related to age, educational level, and body weight status in this population. These data indicated that dietary supplement use was inversely related to some health-related behaviors and socioeconomic factors.Mediterranean Journal of Nutrition and Metabolism 01/2013; 6(1). DOI:10.1007/s12349-012-0111-1