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Vitamin D is a fat soluble vitamin that has important effects on calcium (including absorption of calcium from the diet) and bone metabolism. Vitamin D is known to be stored in fat tissue, and it is also present in the circulation. The purpose of this study is to investigate the relationship between levels of vitamin D in fat tissue and in blood.
Although vitamin D is known to be stored in fat tissue, researchers are not sure about the role that fat tissue plays in vitamin D metabolism. This study will help develop the methodology necessary to further investigate the role of fat tissue in vitamin D metabolism and will assess the relationship between levels of vitamin D in fat tissue and in blood. 50 subjects who are referred for gastric bypass surgery will be enrolled in this study. Subjects will complete questionnaires about their medical history, travel history and food intake. Prior to or during surgery, subjects will be asked to provide a blood sample for selected chemistries related to vitamin D metabolism. During gastric bypass surgery, the surgeon will collect small pieces of fat tissue from the fat under the skin and within the abdomen by surgical biopsy. These samples will be used to refine the methodology for determining the levels of vitamin D in blood and fat tissue and for comparing levels of vitamin D in various tissues.
Observational Model: Case-Only, Time Perspective: Cross-Sectional
Tufts-New England Medical Center
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Published on BioPortfolio: 2014-08-27T03:56:13-0400
Oxidative stress has a role in uremic neuropathy and may be involved in RLS of ESRD patients.Vitamin E &Vitamin C are potential antioxidant supplement that are used in hemodialysis patient...
Vitamin D is available in two forms, vitamin D2 and vitamin D3. It has previously been assumed that these two forms maintain blood vitamin D equally. However, this may not be the case. ...
The investigators want to make sure that people get the right dose of Vitamin D treatment. They will therefore investigate how skin colour, body mass index, ethnicity, vitamin D binding pr...
The purpose of this study is to answer the following questions: Does vitamin D increase calcium absorption, bone mass and muscle mass and function in women past menopause who have mildly l...
Vitamin D is important to maintain good health. Although it is found in foods and vitamins, many people still have low vitamin D levels. One purpose of this study is to describe vitamin ...
Vitamin Bdeficiency is common, and the incidence increases with age. Most people with vitamin Bdeficiency are treated in primary care with intramuscular (IM) vitamin B. Doctors may not be prescribing ...
Vitamin D Deficiency (VDD) is responsible for a wide spectrum of clinical diseases and vitamin D deficiency prevalence is frightening in most parts of the world including Pakistan. Therefore, suppleme...
Vitamin K is necessary for the synthesis of coagulation factors. Term infants, especially those who are exclusively breast fed, are deficient in vitamin K and consequently may have vitamin K deficienc...
Aim Vitamin C and vitamin E supplementations and their beneficial effects on type 2 diabetes mellitus (T2DM) have been subjected to countless controversial data. Hence, our aim is to investigate the h...
To evaluate the efficacy of vitamin D supplementation on the prevention of postoperative vitamin D deficiency.
A lipid cofactor that is required for normal blood clotting. Several forms of vitamin K have been identified: VITAMIN K 1 (phytomenadione) derived from plants, VITAMIN K 2 (menaquinone) from bacteria, and synthetic naphthoquinone provitamins, VITAMIN K 3 (menadione). Vitamin K 3 provitamins, after being alkylated in vivo, exhibit the antifibrinolytic activity of vitamin K. Green leafy vegetables, liver, cheese, butter, and egg yolk are good sources of vitamin K.
A nutritional condition produced by a deficiency of VITAMIN D in the diet, insufficient production of vitamin D in the skin, inadequate absorption of vitamin D from the diet, or abnormal conversion of vitamin D to its bioactive metabolites. It is manifested clinically as RICKETS in children and OSTEOMALACIA in adults. (From Cecil Textbook of Medicine, 19th ed, p1406)
OXIDOREDUCTASES which mediate vitamin K metabolism by converting inactive vitamin K 2,3-epoxide to active vitamin K.
A family of phylloquinones that contains a ring of 2-methyl-1,4-naphthoquinone and an isoprenoid side chain. Members of this group of vitamin K 1 have only one double bond on the proximal isoprene unit. Rich sources of vitamin K 1 include green plants, algae, and photosynthetic bacteria. Vitamin K1 has antihemorrhagic and prothrombogenic activity.
A nutritional condition produced by a deficiency of VITAMIN E in the diet, characterized by posterior column and spinocerebellar tract abnormalities, areflexia, ophthalmoplegia, and disturbances of gait, proprioception, and vibration. In premature infants vitamin E deficiency is associated with hemolytic anemia, thrombocytosis, edema, intraventricular hemorrhage, and increasing risk of retrolental fibroplasia and bronchopulmonary dysplasia. An apparent inborn error of vitamin E metabolism, named familial isolated vitamin E deficiency, has recently been identified. (Cecil Textbook of Medicine, 19th ed, p1181)
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Osteoporosis is a disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse. Follow and track&n...