FMD at 0, 4, and 24 h administration of PN containing soybean oil-based lipid emulsion, olive oil-based lipid emulsion, lipid free PN, and normal saline in healthy subjects. Values are mean ± sem. *, P < 0.05 vs. baseline; †, P = 0.02 vs. olive oil-based PN after 24 h of infusion.