Nick NorwitzMD PhD, Oxford-Harvard | Metabolic Health Educator | “Stay Curious”

Egg Color Is a Scam... Size Matters More

11 Jan 2026 · 1 min

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1:04

In this short video, the speaker debunks the common myth that eggshell color indicates nutritional quality. He explains that shell color is determined genetically: all eggs start white, brown results from the pigment protoporphyrin, blue from oocyanin, and a mix yields green. Hen diet does not affect shell color, though it can influence yolk color, which isn’t visible. The speaker points out that marketers exploit shell color perception, leading to higher prices for blue and brown eggs despite no nutritional advantage. He advises consumers to ignore shell color and instead look for production labels such as pasture‑raised or omega‑3 enriched when seeking higher‑quality eggs, concluding that the interior matters more than the exterior.

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Here's a common egg myth that could save you money. The color of an eggshell tells you nothing about its nutritional value. The size does— this is from an ostrich— but anyway, shell color is almost entirely genetic. All eggs start as white during development, and if no pigment is added, they stay white. If a hen produces a pigment called protoporphyrin, the shell turns brown. If it produces another pigment called oocyanin, it becomes blue, and a mix of these two pigments can create a green-tinted egg. But a hen's diet doesn't usually affect shell color. It can influence yolk color, but you can't actually see that. Still, because shell color is visible, it's easy to associate with quality at the grocery store. Different colors tend to come with different price tags. It's just supply and demand. It's marketing. Blue eggs are often more expensive than brown, and brown are more expensive than white due to perception alone. So if you're looking for high-quality eggs, focus on labels like pasture-raised or omega-3 enriched. But next time you're at the store, remember It's on the inside that counts. Unless you're dating a chicken, then maybe looks matter a little bit.