Abstract
Previous results have shown that one-year daily consumption of a lutein-enriched egg yolk containing dairy drink did not significantly affect fasting serum lipid and lipoprotein concentrations in adults with early signs of macular degeneration. The current study further substantiates these findings with parameters reflecting endothelial function. Additionally, we extend our observations from the fasting to the postprandial situation. Subjects participated in a 1-y randomized placebo-controlled dietary intervention trial. 52 subjects were included in the active (Egg) group and 49 in the control (Con) group. Changes in postprandial biochemistry (triacylglycerol (TAG), glucose and non-esterified fatty acids (NEFA)) following a mixed meal and flow-mediated dilation (FMD) analyses were evaluated at the start and after one year intervention. Postprandial glycemic and lipemic responses before the intervention as well as the differences in postprandial responses after one-year intervention were comparable between the Egg and the Con group. Fasting FMD was comparable between the groups before the intervention started and at the end of intervention. Additionally, the change in FMD following a mixed meal was comparable between the groups. To conclude, one-year consumption of a lutein-enriched egg yolk incorporated in a dairy drink has no effect on postprandial lipid and glucose metabolism or endothelial function.
Highlights
Previous results have shown that one-year daily consumption of a lutein-enriched egg yolk containing dairy drink did not significantly affect fasting serum lipid and lipoprotein concentrations in adults with early signs of macular degeneration
This study shows that during a period of one year, daily consumption of a dairy drink containing 1.5 lutein-enriched egg-yolks, does not affect postprandial glycemic and lipemic responses and endothelial function as measured by flow-mediated dilation
With average serum LDL cholesterol concentrations of 3 mmol/l, this means an increase in serum LDL cholesterol of approximately 5%
Summary
Previous results have shown that one-year daily consumption of a lutein-enriched egg yolk containing dairy drink did not significantly affect fasting serum lipid and lipoprotein concentrations in adults with early signs of macular degeneration. One-year consumption of a lutein-enriched egg yolk incorporated in a dairy drink has no effect on postprandial lipid and glucose metabolism or endothelial function. Lutein is a xanthophyll that is concentrated in the human retina where it plays an important role in maintaining visual function It is not synthesized in the human body and intake depends on dietary sources such as eggs and green leafy vegetables. Traditionally prepared buttermilk prevents the anticipated increase in serum cholesterol concentrations when consuming 1.5 egg yolks daily. This hypothesis has been tested and was reported in a separate study[12]
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