Anyone who’s had the pleasure of cooking with free-range, organic eggs has probably noticed the difference in colour between eggs from healthy, free-range chickens and caged chickens from mass farming projects. (Updated July 25, 2021)
Many people have written about the darker orange colour and thicker consistency that farm-fresh, free-range egg yolks have, especially in comparison to eggs from caged chickens, which are typically thinner and a pale yellow colour.
But how does the difference in colour and texture between these different types of eggs come about? Does it represent a significant difference in nutritional value? The answer, according to nutritionists, may in fact be yes.
It’s All In The Chickens’ Diet
The darker colour in free-range egg yolks comes from carotenoids called xanthophylls(1), which are found in dark leafy greens such as kale, collards, broccoli, and spinach.
These are present in the diets of many chickens raised on small, sustainable farm operations – chickens on these farms are more likely to be omnivorous rather than vegetarian; pastured chickens diets typically include bugs, grubs, and meal worms – some particularly aggressive chickens have been known to go after small rodents as well!
Caged chickens are typically fed a vegetarian diet made up of grains, with corn incorporated to give the yolks a brighter yellow hue. But not even corn can come close to providing the same colour that a natural free-range, pastured diet can.
Greater Nutritional Value
When chickens consume a diet rich in proteins as well as grains (like flaxseed), the nutrients they consume are concentrated into the yolks of their eggs, giving them a darker orange col