You're standing in front of the egg case, holding a carton of white eggs in one hand and a carton of brown ones in the other. The brown ones cost more, they look more like something from a farm, and the price feels like proof that they're better for you. Into the cart they go.
This is not your fault. Brown shells have been sold as the wholesome choice for years, and the price difference makes it look true. But the color of the shell says almost nothing about what you'll find when you crack it.
The color comes from the hen
According to the USDA's Food Safety and Inspection Service, the breed of the hen determines the color of the shell, and nutrient levels are not significantly different in white and brown eggs.
Cornell University's College of Agriculture and Life Sciences gives a simple rule of thumb: hens with white feathers and white earlobes tend to lay white eggs, while hens with red or brown feathers and red earlobes tend to lay brown ones. The pigment is usually added to the outer shell during the last few hours before the egg is laid, and shell color doesn't change the yolk's color or taste.
So why the higher price? Cornell explains that brown-egg hens tend to be larger and cost more to feed and raise. You're paying for the hen, not for a more nutritious egg.
What actually changes the egg inside
If shell color doesn't matter, these things do:
- The hen's feed. The FSIS notes that yolk color varies with the hen's diet: feed with yellow-orange plant pigments makes a darker yolk. Cornell adds that feed can affect nutritional content too.
- Omega-3 claims. University of Florida Extension explains that adding ingredients such as kelp to a hen's diet can raise the omega-3 content of her eggs. That's why "omega-3" eggs carry the claim on the carton, whatever their color.
- Freshness and storage. The FSIS says raw eggs in the shell keep 3 to 5 weeks in a refrigerator set at 40°F or below. U.S. eggs are washed before they reach the store, which is why they need the fridge once you bring them home.
- Size. A large egg holds more than a medium one, whatever the shell looks like, so compare cartons of the same size.
Plan B if you still prefer brown eggs: buy them for the look or the farm you're supporting, not for the nutrition, and read the carton for the claims that actually describe the hen's diet.
Where the shell-color answer gets fuzzy
The rule isn't perfectly black and white. Cornell notes that brown eggs may contain slightly more omega-3 fatty acids, but the difference is small. The earlobe rule is a general guide, not a law of nature: some breeds, such as the Ameraucana, lay blue eggs.
Specialty eggs also vary from farm to farm, depending on how the hens are fed. And an egg allergy applies to every color of shell.
Whatever you buy, food safety stays the same: keep eggs refrigerated, and cook egg dishes until they reach 160°F, according to USDA guidelines. If you're watching cholesterol or have a heart condition, ask your doctor or a registered dietitian how eggs fit your diet.
Pick the carton by its date, its size and its label, not its color. That's the trick.
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