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International Journal of Endocrinology
Volume 2011 (2011), Article ID 809069, 5 pages
Clinical Study

Effect of High- versus Low-Fat Meal on Serum 25-Hydroxyvitamin D Levels after a Single Oral Dose of Vitamin D: A Single-Blind, Parallel, Randomized Trial

1Programa de Pós-Graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2400, 90035-003 Porto Alegre, RS, Brazil
2Serviço de Medicina Interna, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350/700, 90035-903 Porto Alegre, RS, Brazil

Received 10 July 2011; Revised 15 September 2011; Accepted 16 September 2011

Academic Editor: Ajai Kumar Srivastav

Copyright © 2011 Fabiana Viegas Raimundo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background/Aims. Vitamin D3 is liposoluble, so dietary fat could increase its oral absorption. Our aim was to compare serum 25-hydroxyvitamin D [25(OH)D] after the oral intake of cholecalciferol with a high- or low-fat meal. Methods. In a single-blind, parallel clinical trial, 32 healthy physicians were divided into two groups. In the same day, they ingested 50,000 IU (1.25 mg) of vitamin D3 with food: group 1 (G1): lipids: 25.6 g and group 2 (G2) lipids: 1.7 g. Serum 25(OH)D (0, 7, and 14 days), and parathyroid hormone (PTH), and calcium (0 and 14 days) were measured. Results. Baseline mean serum 25(OH)D levels were 42.7±19.0 nmol/L in G1 and 36.4±19.0 nmol/L in G2 (P=0.38). After cholecalciferol, mean serum 25(OH)D was higher in G1 (P<0.001): 7 days: G1 = 46.2 (38.4–53.9) nmol/L and G2 = 33.7 (25.4–40.1) nmol/L; 14 days: G1 = 53.7 (45.2–62.1) nmol/L and G2 = 33.7 (25.2–42.2) nmol/L. Serum PTH and 25(OH)D were negatively correlated before and after the intake of vitamin D3, respectively, r=-0.42 (P=0.02) and r=-0.52 (P=0.003). Conclusions. A high-fat meal increased the absorption of vitamin D3, as measured by serum 25(OH)D.