Info on egg whites courtesy of loren cordain:
Lysozyme from Egg Whites by Loren Cordain
In all three of my books, I have advocated egg consumption, particularly eggs that are produced with high omega 3 fatty acid contents. Chicken eggs
are generally a nutritious food and are a good source of selenium, vitamin A, vitamin D and the B vitamins, some minerals and lutein as Barbara
indicated. Additionally, numerous recent experimental and epidemiological studies (reviewed in references 1, 2) indicate that regular egg consumption
(7 per week) does not increase the risk for coronary heart disease (CHD). As I have previously noted, although eggs are one of the most concentrated
sources of dietary cholesterol (212 mg per egg), dietary cholesterol has a minimal effect upon blood cholesterol concentrations in most people1, 3.
Further, high cholesterol egg diets cause an increase in blood HDL particles1 and reduce the highly atherogenic small dense LDL particles while
simultaneously increasing the less atherogenic large, "fluffy" LDL particles4, 5.
So, 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.
If we follow up on the clue from the evolutionary template and examine eggs more closely, they maintain certain nutritional shortcomings that may be
problematic, particularly for people suffering from autoimmune diseases and allergies. Although eggs are classified as animal food sources and are
lumped together with meats in the USDA My Pyramid, eggs are uniquely different from meats in that they represent the reproductive endpoints of adult
birds which exist outside their mother’s body in a semipermeable, warm compartment. As such, all eggs are particularly vulnerable to invasion,
attack and destruction by microorganisms such as fungi, bacteria and viruses present in their nesting environment.
The innermost yolk of a chicken egg represents the growing embryo which is anchored to the albumen or egg white by structures called chalazae. Outward
from the egg white are the inner and outer membranes and then the shell, all of which provide physical barriers to infection from pathogens and
microorganisms. The egg white makes up about 58% of the total egg volume and contains about 50% of the total egg protein and is composed of 88.5%
water, 10.5% protein and 0.5% carbohydrate6. The function of the egg white is threefold: 1) storage of nutrients for the growing embryo (yolk), 2)
protection of the egg from microbial attack, and 3) transport of nutrients into the growing embryo.
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. Table 1 lists the major proteins in egg whites and their likely
functions.
[edit on 13-8-2010 by Sourdough4life]


