The eggs situation is more simple than you could ever imagine. Brown eggs are given by brown and dark chickens, and white eggs come from white chickens. So the million dollar question is - what is the difference between those chickens? The darker chickens are usually bigger in size, hence they need to eat more, bringing higher costs to the manufacturer. This difference is minimal, but the manufacturers like to use the popular misconception that brown eggs are for some reason healthier than white eggs, and earn some additional cash. In reality, the contents of the eggs are exactly the same, and they have all the same nutritional values.