a1 Lipid and Atherosclerosis Unit, Internal Medicine Service, Reina Sofía University Hospital, Avenida Menéndez Pidal s/n, Córdoba 14004, Spain
a2 Ciber Fisiopatología Obesidad y Nutrición (CB06/03) del Instituto de Salud Carlos III, Spain
a3 Biochemistry Service, Reina Sofía University Hospital, Córdoba, Spain
Traditional cardiovascular risk factors are associated with endothelial dysfunction. The vascular endothelium plays a key role in local vascular tone regulation and can be modulated by dietary fat. We propose to determine the chronic effect of three diets with different fat compositions on postprandial endothelial function and inflammatory biomarkers. Twenty healthy men followed three 4-week diets in a randomised cross-over design: a Western diet, rich in saturated fat (22 % SFA, 12 % MUFA and 0·4 % α-linolenic acid (ALA), all fractions are % of energy); a Mediterranean diet, rich in MUFA ( < 10 % SFA, 24 % MUFA and 0·4 % ALA); a low-fat diet enriched in ALA ( < 10 % SFA, 12 % MUFA and 2 % ALA). At the end of each dietary period all subjects underwent a postprandial study. Plasma concentrations of lipid parameters, soluble intercellular cell-adhesion molecule-1, soluble vascular cell-adhesion molecule-1 (sVCAM-1), nitrates and nitrites (NOx) and endothelial function studied by laser Doppler were examined at 0, 2, 4, 6 and 8 h. The endothelium-dependent vasodilatory response was greater 4 h after the ingestion of the MUFA-rich diet than after the SFA or ALA low-fat diets (P = 0·031). The 4 h postprandial plasma sVCAM-1 levels were lower after the MUFA meals than after the ALA low-fat diet (P = 0·043). The bioavailability of NOx was higher following the MUFA diet than after the SFA and ALA low-fat diets (P = 0·027). We found no differences in the other parameters measured. Chronic ingestion of a Mediterranean diet avoids the postprandial deterioration of endothelial function associated with Westernised diets in healthy individuals.
(Received May 16 2007)
(Revised November 05 2007)
(Accepted November 06 2007)
(Online publication February 14 2008)
Abbreviations: ALA, α-linolenic acid; IRH, ischaemic reactive hyperaemia; NOx, nitrates and nitrites; sICAM-1, soluble intercellular cell-adhesion molecule-1; sVCAM-1, soluble vascular cell-adhesion molecule-1.