title: 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.
abstract: Background/Aims. Vitamin D(3) 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 D(3) 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 D(3), respectively, r = -0.42 (P = 0.02) and r = -0.52 (P = 0.003). Conclusions. A high-fat meal increased the absorption of vitamin D(3), as measured by serum 25(OH)D.
authors.affiliation: Programa de Pós-Graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2400, 90035-003 Porto Alegre, RS, Brazil.
authors.forename: Fabiana Viegas
authors.initials: FV
authors.lastname: Raimundo
authors.forename: Gustavo Adolpho Moreira
authors.initials: GA
authors.lastname: Faulhaber
authors.forename: Paula Kalinka
authors.initials: PK
authors.lastname: Menegatti
authors.forename: Leonardo da Silva
authors.initials: Lda S
authors.lastname: Marques
authors.forename: Tania Weber
authors.initials: TW
authors.lastname: Furlanetto