Fertilized and Unfertilized Egg Biology
The differences biologically between fertilized and unfertilized eggs are due to a tiny germinal disc (with sperm) that could theoretically develop into an embryo if incubated.
If the fertilized egg is not kept warm either via an incubator or broody hen, it is virtually identical to an unfertilized egg, as there is no meaningful development of the embryo.
The sperm contribution to egg nutrition is negligible. The total protein content of infertile eggs shows no significant difference from that of unfertilized eggs. (1)
One peer-reviewed study identified minor molecular/proteomic differences in fresh fertilized vs. unfertilized eggs, but nothing that would notably impact overall nutrition. (2)
Another study noted structural changes in ovalbumin, the primary protein in egg whites, post-fertilization, and referenced potentially altered antioxidant properties in that specific protein. (3)
However, this research relates to the egg’s role in supporting embryo development if incubated—they do not translate to greater nutritional value, bioactivity, or health benefits when the egg is eaten as food.
In short, no studies measure or claim improvements in human-digestible nutrients, overall antioxidant capacity of the whole egg, or superior health outcomes from eating fertilized, non-incubated eggs.
Fertilized Eggs in Traditional Diets
Despite science insisting that there is no difference between fertilized and unfertilized eggs, traditional Asian cultures consider fertilized eggs as a beneficial dietary supplement. (4)
The big difference is that the egg is incubated for 2-3 weeks, which develops the embryo considerably, adding nutrient value.
Philippines
For example, in the Philippines, balut, fertilized duck eggs, is a beloved street food and cultural staple.
The fertilized duck egg required to make balut is incubated for about 14–21 days and then boiled and eaten whole, including the partially formed duck embryo.
Total incubation time for a duck egg is 28 days (fertilization to hatching), so balut essentially involves the consumption of a half to two-thirds fully formed duckling.
Balut is traditionally seen as a potent source of energy, protein, and overall nourishment. Many believe it boosts vitality, acts as an aphrodisiac (especially for men, enhancing virility and strength), supports postpartum recovery for women, and serves as a “superfood” for brain health and general well-being.
For Complete Cooking STEPS Please Head On Over To Next Page Or Open button (>) and don’t forget to SHARE with your Facebook friends.
