I could understand issues with dairy and wheat, they are to some extent, neolithic, so some people aren't adapted to handle them, but eggs have been in our evolutionary history for a long time, at least I think they have, yet many people can't handle them. I imagine we should be largely adapted to handling eggs and the antinutrients in egg whites by now. Does it all come down to an unhealthy gut? Did the eggs cause the damage or are they innocent?
From "Lysozyme from Egg Whites" by Loren Cordain..
"Should everybody include eggs in their diet on a daily basis? Not necessarily, particularly if we examine the evolutionary template. Without question our preagricultural ancestors would have collected and consumed eggs from birds’ nests whenever possible. However, in the wild, bird eggs only appear seasonally. Hence, pre-agricultural humans could have never consumed two eggs for breakfast every morning of the year similar to some westernized people, but rather only occasionally for a few brief weeks or months."
"As I have previously mentioned, a chicken egg is the reproductive endpoint for adult birds and survives by living outside its mother’s body in a semi permeable compartment that is essentially immovable. Accordingly, it has no means of protecting itself from microorganisms or predation by physical escape or avoidance. For this reason, the evolutionary strategy eggs have taken to protect themselves from microbial invaders is to select for toxic substances in the egg white; mainly in the form of antimicrobial proteins."
So, while the nutritional content of an egg can be influenced by the diet of the bird (chicken or otherwise) and individual tolerance can vary for genetic or digestive reasons, the bottom line is that an egg is not designed to be food for anything but the developing bird embryo.
If one is inclined to eat eggs everyday, it seems like issues of intolerance or allergy could be bypassed by eating only egg yolks as the egg white seems to be the specific medium where the problematic substances are located. Or, eggs consumption could be eaten in a sporadic, seasonal manner which would align more optimally with our ancestral intake patterns.
There may certainly be a gut health angle here, and there probably is, but I think what we're feeding our chickens who lay the eggs is far more important. Bugs and grass shoots have been replaced by soy and cracked corn. Even the free range eggs often say "vegetarian fed" and while I'm glad the chickens aren't eating animal by-products that weren't fit for pet food, that is not what I want to see on a label.
Primitive people undoubtedly collected a whole variety of species eggs, probably a very small percentage of them from the chicken family. Our modern reliance on chickens invites alergies and sensitivities to develop.
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