Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Body fat and cholecalciferol supplementation in elderly homebound individuals

Full text
Author(s):
M.H.S. Canto-Costa [1] ; I. Kunii [2] ; O.M. Hauache [3]
Total Authors: 3
Affiliation:
[1] Universidade Federal de São Paulo. Escola Paulista de Medicina. Disciplina de Endocrinologia - Brasil
[2] Universidade Federal de São Paulo. Escola Paulista de Medicina. Disciplina de Endocrinologia - Brasil
[3] Universidade Federal de São Paulo. Escola Paulista de Medicina. Disciplina de Endocrinologia - Brasil
Total Affiliations: 3
Document type: Journal article
Source: Brazilian Journal of Medical and Biological Research; v. 39, n. 1, p. 91-98, 2006-01-00.
Abstract

Vitamin D deficiency, observed mainly in the geriatric population, is responsible for loss of bone mass and increased risk of bone fractures. Currently, recommended doses of cholecalciferol are advised, but since there are few studies evaluating the factors that influence the serum levels of 25-hydroxyvitamin D (25(OH)D) following supplementation, we analyzed the relationship between the increase in serum 25(OH)D after supplementation and body fat. We studied a group of 42 homebound elderly subjects over 65 years old (31 women) in order to assess whether there is a need for adjustment of the doses of cholecalciferol administered to this group according to their adipose mass. Baseline measurements of 25(OH)D, intact parathyroid hormone and bone remodeling markers (osteocalcin and carboxy-terminal fraction of type 1 collagen) were performed. Percent body fat was measured by dual-energy X-ray absorptiometry. The patients were divided into three groups according to their percent body fat index and were treated with cholecalciferol, 7,000 IU a week, for 12 weeks. The increases in serum levels of 25(OH)D were similar for all groups, averaging 7.46 ng/mL (P < 0.05). It is noteworthy that this increase only shifted these patients from the insufficiency category to hypovitaminosis. Peak levels of 25(OH)D were attained after only 6 weeks of treatment. This study demonstrated that adipose tissue mass does not influence the elevation of 25(OH)D levels following vitamin D supplementation, suggesting that there is no need to adjust vitamin D dose according to body fat in elderly homebound individuals. (AU)