Like spinach and other leafy greens, egg yolks are also a good source of lutein and zeaxanthin. In one study, researchers found that lutein levels increased by 26%, while zeaxanthin levels increased by 38% when subjects ate one egg per day. They also found that eating an egg-a-day did not impact LDL or HDL cholesterol or triglycerides. Specialty eggs are also available that have significantly more lutein per egg, due to simply feeding hens more carotenoid-rich feed. Egg yolks are also a natural source of vitamin D, which may reduce the risk for ARMD.
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