View clinical trials related to Avitaminosis.
Filter by:Three hundred thirty (330) overweight, pre-hypertensive/controlled hypertensive, African-American participants will be enrolled in a 8 week study to assess the effect of two administrations of Vitamin D3 on Vitamin D serum responsiveness as a function of clinical, biologic and genetic factors. The investigators anticipate that at least 300 participants will complete this study. Written, signed and dated informed consent to participate in the study will be given by the participant or a legally acceptable representative, in accordance with the International Conference on Harmonization (ICH) Good Clinical Practice (GCP) Guideline E6 and applicable regulations, before completing any study-related activities/procedures. The original signed and dated consent will be kept in the subject's research file and a copy given to the subject. A copy will also be placed in their medical record.
The primary aim of the current study was to investigate whether the consumption of vitamin D3 enriched, reduced-fat yellow cheese can counterbalance the expected decrease in serum 25-hydroxyvitamin D concentration during winter in postmenopausal women in Greece, and in what degree it can contribute as a potential food-based strategy for the prevention of vitamin D deficiency. A secondary aim was also to investigate any potential effect of the intervention in several quality of life (QoL) indices in the population of postmenopausal women under study.
The purpose of this study is to determine if there is correlation between Vitamin D deficiency and spinal disease/spinal fusion surgery.
Documented roles for vitamin D in calcium homeostasis, cardiovascular and respiratory health, inflammation, innate immunity, and neuromuscular function have led to the hypothesis that deficiency might represent a modifiable risk factor for outcomes in critical illness. In recent years, dozens of adult studies have reported both high deficiency rates, and associations between lower vitamin D levels and organ dysfunction, health resource utilization, and mortality in the intensive care unit (ICU). More recently, similar observations have been made in critically ill pediatric populations. The cumulative body of basic science and clinical literature demonstrates that deficiency is common in critical illness and rapid normalization of vitamin D status could improve clinical outcomes and/or reduce health care costs. However, before conducting a phase III trial to determine whether restoration of vitamin D status improves outcomes in the PICU, the appropriate dosing regimen must be identified. Consequently, the investigators propose a phase II, double blind randomized controlled trial to determine a loading therapy dosing regimen that can safely and rapidly normalize vitamin D status in critically ill children.
The optimal vitamin D replacement dose during pregnancy remains undefined. Therefore, the aim of this study is to test the hypothesis that a daily equivalent dose of vitamin D of 3,000 IU/day is needed for Middle Eastern women, to optimize maternal vitamin D level and neonatal musculoskeletal parameters, specifically knee-heel length at birth and bone mineral content at one month of age.
This study investigates the effect of vitamin D deficiency on drug metabolism and transport in patients with chronic kidney disease (CKD) and in healthy controls. The central hypothesis is that vitamin D concentrations independently affect metabolism and transport function in CKD patients. An over-arching goal of this proposal is to make drug therapies safer and more effective to reduce the significant morbidity and mortality in patients with CKD.
This randomized, placebo-controlled trial in Thai pregnancy is conducted. The study aims to determine whether vitamin D3 1,800 IU/d supplementation in lactating mother improves vitamin D status of breastfed infant.
The purpose of this study is to evaluate the most effective treatment for patients who underwent a Roux-en-Y gastric bypass and developed postoperatively a vitamin B12 deficiency.
The incidence of type 2 diabetes mellitus and obesity is increasing at an alarming rate both nationally and worldwide. Accumulating evidence suggests that serum cholecalciferol levels may be inversely related to the prevalence of diabetes, insulin resistance and metabolic syndrome. However, to demonstrate a causal relation between vitamin D and glucose metabolism, evidence from randomized and adequately powered placebo-controlled intervention trials is needed.The trials available on the effect of Vitamin D supplementation are not conclusive. Hence, the purpose of this study was to conduct a double-blind randomized trial in Vitamin D deficient obese type 2 diabetic Emirati population to clarify the effect of vitamin D supplementation on glycemic control and obesity parameters.
The goal of this investigator-initiated study is to determine whether the fortification of orange juice with vitamin D, vitamin A, and vitamin E will enhance the vitamin D, vitamin A, and vitamin E status children ages 6-10 that are seen at the Division of Pediatrics at Boston University Medical Center. Circulating concentrations of 25-hydroxyvitamin D [25(OH)D], vitamin A, and vitamin E before, will be measured at mid-intervention (week 6), and after a period of twelve weeks. This study plans to recruit 180 male and female subjects between the ages of 6 and 10. An informed consent will be explained and discussed with the subjects and their parents/guardians willing to participate in the study. The study will be twelve weeks. Blood will be drawn during the initial visit, mid-intervention (week 6), and week 12. Dietary intake will be assessed at baseline and at the conclusion of the 12-week intervention using a 3-day food record. The subjects will be randomized in a double-blinded manner via an electronically shuffled listed. Subjects will be randomized to receive one of three beverages: (1) calcium plus vitamin D fortified orange juice (intervention A), (2) calcium plus vitamins D, A, and E fortified orange juice (intervention B) or (3) calcium-only fortified orange juice (controls). Subjects in all groups will drink two 8-oz. glasses of juice at least six hours apart (morning and afternoon) per day for a period of 12 weeks. Subjects randomized to intervention A will receive 200 IU vitamin D and 700 mg of calcium per day in 2 glasses of juice, intervention B will receive 200 IU vitamin D, 12 IU vitamin E, 2000 IU vitamin A as beta carotene, and 700 mg of calcium per day in 2 glasses of juice, while controls will receive 700 mg of calcium per day in 2 glasses of juice. A blood sample will be obtained before the subjects begin drinking the orange juice and at week 12 to determine levels of 25(OH)D which is a measure of vitamin D status. Blood will also be used for determining osteocalcin, parathyroid hormone (PTH), alkaline phosphatase, phosphorus, calcium, C-telopeptide (CTX), albumin, vitamin A, and vitamin E. A blood sample will also be obtained at week 6 for 25(OH)D and PTH.