There are some who eat nothing but ribeye and salt. They look very healthy but it seems a bit boring to me. Some people have egg allergies and obviously they shouldn't eat them. But nothing is healthier than an egg yolk in my opinion. Even Shawn Baker includes eggs. I think egg yolk is a delicious sauce and elevates the nutrition of things like chicken breasts and ground beef. It is generally wise to cook those items to well done and as such you will lose some nutrition; the eggs yolks will replace them; free range but not necessarily organic are the best choice if you can afford them. They sometimes will over feed the chicken with cheap grains to cost cost on organic, lessening the nutrition found in the yolk.