Why is it that you discard the egg yolk?
I think that 4-6 yolks would be too much choline http://www.whfoods.com/genpage.php?tname=nutrient&dbid=50
see egg info athttp://www.whfoods.com/genpage.php?tname=foodspice&dbid=92
Two large eggs provide 252 milligrams of choline (all in yolk), a little less than half the recommended daily supply, and and also contain 630 milligrams (yes, milligrams not micrograms) of phosphatidylcholine
I know that I definately get the rest from beef, chicken, and I always throw a couple tablespoons of wheat germ and flax seed in my oatmeal. I eat alot of egg whites because I just figure that 4-6 will get me up to the same amount of protein as a serving of lean animal protien. Just seems like alot of eggs sometimes when I think about it.