The color of the egg's shell has nothing to do with its nutrient content.
An egg's shell color is just that, a color, meaning nothing but that a breed of chicken that lays that color egg happened to lay that egg.
This isn't a rumor that is just confined to brown eggs either; there are lots of people who don't believe the rumors about brown eggs but still claim green or blue eggs have lower cholesterol.
The only difference in nutritional content might arise because of how the hens that laid the eggs were raised.
Hens who eat a more natural diet lay eggs that are healthier for us to eat, and often we only get brown, blue, green, and other than white colored eggs from non-commercial egg sources, which means they might have had a more natural diet and the eggs will be healthier.
But that does not mean the eggs are healthier simply for having a different color shell.
Industrial chicken is distinct in that it lacks taste. PPL tend to prefer white meat, and as a result, chickens destined for the table are bred to rapidly grow large breasts. These chickens are slaughtered often after fewer than 2 months of life. The animals don't live long enough to develop the complex flavors that a wild animal might gain through a long life and varied diet. Therefore, industrial chicken tastes of very little without added flavor.
The reason "everything" tastes like chicken is because pork and beef have been industrialized in much the same way as chicken has. Mass-produced pork in particular lacks many of the flavor compounds that a wild pig would possess. Fish have not been bred the same way as land animals have, but they are farmed, and the majority of ppl seem to prefer more sedately flavored seafood like catfish, cod, or tilapia, over more interesting catches.
Though “which came first the chicken or the egg” is a philosophical question more than a real one, we do know which came first.
Chickens have been genetically traced back to Jungle Fowl or Gallus gallus, a type of bird that lives in Asia and is classified as a pheasant but can still interbreed with some chickens, similar to how a dog and wolf are.
At some point, a genetic mutation occurred inside a Jungle Fowl hen when the rooster's genes and the hen's genes mixed. When the hen laid the fertilized egg, instead of a Jungle Fowl, the egg produced a chicken.
There is still debate over which Jungle Fowl variety chickens actually came from. Most believe it to be the Red type of Jungle Fowl, but there are several varieties, and all are closely related.
The jury is still out on WHY the chicken crossed the road. But new research reveals an inbuilt magnetic compass guides domestic chickens when they do venture across the asphalt and other surfaces.
Many animals have an innate sense of direction, finding their way along migration routes that extend thousands of miles. Often, they detect Earth’s magnetic field and use that for orientation.
Anyone who refuses a double-dog dare is liable to be labeled a chicken. How dogs found their way into dare culture remains a bit of a mystery—but the reason cowards are called “chickens” is slightly clearer.
According to the Oxford English Dictionary, the earliest written instance of the word chicken in the craven sense comes from William Shakespeare’s Cymbeline, circa 1616. "Forthwith they fly, Chickens,” he wrote, describing soldiers fleeing a battlefield.
But as Grammarphobia reports, domestic fowl had been associated with an absence of bravery long before the 17th century. One play from around 1450 described a coward as a “henne-harte,” and poet John Skelton likened some spineless courtiers to “hen-hearted cuckolds” in his poem Why Come Ye Nat to Courte circa 1529.