Serum vitamin D metabolites and intestinal calcium absorption efficiency in women
نویسندگان
چکیده
منابع مشابه
Serum vitamin D metabolites and intestinal calcium absorption efficiency in women.
BACKGROUND Vitamin D sufficiency may be determined by the serum concentration of 25-hydroxyvitamin D [25(OH)D] that results in maximal intestinal calcium absorption efficiency. However, some investigators questioned whether 25(OH)D concentrations above the concentrations associated with rickets or osteomalacia influence calcium absorption. OBJECTIVE We determined whether calcium absorption ef...
متن کاملEffects of vitamin D metabolites on intestinal calcium absorption and bone turnover in elderly women.
BACKGROUND The relative importance of vitamin D metabolites in the regulation of gut calcium absorption has not been well studied in elderly women living in an environment with abundant sunlight. OBJECTIVE The objective was to examine the determinants of active gut calcium absorption ( +/- SD: 42 +/- 11%) after an overnight fast with the use of a low (10 mg) calcium load. DESIGN One hundred...
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Intestinal calcium absorption assessed by a double-isotope method, decreased significantly with aging in 94 normal subjects (r = -0.22, P < 0.025). In 52 untreated patients with postmenopausal osteoporosis, calcium absorption was significantly lower than normal when either age or habitual calcium intake was used as a covariable (P < 0.001). Serum 25-hydroxyvitamin D (25-OH-D) and 1,25-dihydroxy...
متن کاملSerum vitamin D metabolites and calcium absorption in normal young and elderly free-living women and in women living in nursing homes.
Vitamin D deficiency, which causes osteomalacia, may also be important in the pathogenesis of age-related osteoporosis. We studied serum vitamin D metabolites in 52 young women (mean age: 30 +/- 3 y; range: 25-35 y), 64 elderly free-living women (mean age: 71 +/- 4 y; range: 65-82 y), and 60 elderly women living in nursing homes (mean age: 84 +/- 9 y; range: 61-102 y). Mean serum 25-hydroxyvita...
متن کاملEvolution of the Calcium Paradigm: The Relation between Vitamin D, Serum Calcium and Calcium Absorption
Osteoporosis is the index disease for calcium deficiency, just as rickets/osteomalacia is the index disease for vitamin D deficiency, but there is considerable overlap between them. The common explanation for this overlap is that hypovitaminosis D causes malabsorption of calcium which then causes secondary hyperparathyroidism and is effectively the same thing as calcium deficiency. This paradig...
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ژورنال
عنوان ژورنال: The American Journal of Clinical Nutrition
سال: 2010
ISSN: 0002-9165,1938-3207
DOI: 10.3945/ajcn.2010.29553