I was reading something that said there's no way to change the color of your eggshells via the egg-layer's diet. Yolks, yes. Shells, no. It occurred to me that I get deep green eggs at the beginning of my EE's egg-laying cycle, and the eggs get both less brown and less blue as the year progresses. I read somewhere else that the reason for this is that she's running out of pigment. Makes sense. But if she's running out of pigment, doesn't she have to replenish it somehow? And wouldn't the pigment have to come from her diet somehow? Some Wiki research later, I found that biliverdin (goes into eggshells to make them blue) is a byproduct of heme digestion. Heme is in iron-based blood. So my question is this: Could a diet high in animal products make eggs hells bluer?