Eggshell color is unrelated to nutrition
Some people prefer red-shelled eggs, while others like blue-shelled ones, believing they are more nutritious. In fact, the nutritional value of an egg is not necessarily linked to its shell color, but depends on the nutritional composition of the feed and the chicken's feeding conditions. Generally, shell color is darkest at the beginning of the laying cycle and gradually fades. Chickens with high egg production lay eggs with lighter-colored shells. Additionally, shell color cannot be used to determine if an egg is a "free-range" egg.
Small eggs are not all free-range eggs
Egg weight is greatly influenced by genetics; different breeds of chickens lay eggs of different weights. The physiological stage of the chicken also affects egg weight, and nutritional factors and feed management also have a certain impact.
"Red-yolk" eggs may be due to artificial coloring
When buying eggs, many people prefer free-range eggs and believe that a golden yellow or reddish-brown yolk indicates a free-range egg. In fact, this standard of judgment is not scientific.
Ordinary egg yolks are light yellow. To make eggs have a "red yolk," pigments must be added to the feed. Therefore, the "red-yolk" eggs we pay extra for are very likely to have been artificially colored.