Background: In some epidemiological studies, blood lipids are determined at non-fasting state, which may impact cardiovascular risk estimation. The aim of this study was to evaluate postprandial LDL-C changes in men with newly diagnosed metabolic syndrome (MetSy). Methods: 36 male patients were examined: 12 men with and 24 men without MetSy. The fat tolerance test was performed before and after a three-month hypolipidemic treatment. Serum lipids were measured using routine methods, lipid peroxides (LPO) colorimetrically, apoli- poproteins A-I, B, and hsCRP immunoturbidimetrically. Results: The postprandial increase in triglycerides was associated with a decrease in LDL-C and a small decrease in apo B. In men with MetSy, the mean change in LDL-C (-19.5 ± 2.3 mg/dl) was greater than in healthy men (-5.7 ± 3.8 mg/dl). All lipid changes (ΔTG, ΔLDL-C and ΔLPO) were linearly dependent on the postprandial non-LDL-choles- terol. After three months of hypolipidemic treatment, in all men with MetSy, the apoB/apoA-I ratio remained the same as before the therapy. Conclusion: In men diagnosed with MetSy, postprandial decreases in LDL-cholesterol may cause underestimation of cardiovascular risk. After three months of hypolipidemic treatment, there was only a partial reduction in this risk, as the apoB/apoA-I ratio remained the same.
 Alberti KG, Eckel RH, Grundy SM, Zimmet PZ, Cleeman JI,
Donato KA, et al. Harmonizing the metabolic syndrome: a joint
interim statement of the International Diabetes Federation
Task Force on Epidemiology and Prevention; National Heart,
Lung, and Blood Institute; American Heart Association; World
Heart Federation; International Atherosclerosis Society; and
International Association for the Study of Obesity. Circulation.
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