Sainsbury's has announced it will no longer sell brown eggs, switching exclusively to white eggs. The decision has prompted many British consumers to question whether there is any nutritional difference between the two varieties, and whether the move should affect their shopping habits.
Why Sainsbury's Is Switching to White Eggs
The supermarket chain's choice is based on its own research, which found that white eggs have a 12.7% lower carbon footprint compared to brown eggs. Hens that produce white eggs consume less feed while laying the same number of eggs, reducing resources across the supply chain. Feed production accounts for 50-60% of the environmental impact of egg farming.
Britain consumes approximately 14.5 billion eggs annually, generating an estimated 4.35 million tonnes of carbon dioxide emissions. If the entire sector achieved the same 12.7% reduction, emissions could drop by over 550,000 tonnes of CO2 each year, according to The Independent. That is roughly equivalent to taking nearly 300,000 cars off British roads, reports the Express.
Nutritional and Quality Differences: Minimal
For most of the 20th century, white eggs were standard in the UK. In the 1970s, brown eggs became associated with middle-class quality and dominated the market. Today, many consumers believe darker shells and more vibrant yolks indicate superior quality, but experts say the differences are minimal.
Influencer Sunna Van Kampen, known as @tonichealth, explained in a TikTok video that vivid orange yolks result from the chickens' diet rather than quality. She said: "The reason why your yolks are so dark and orange... is because they feed [the hens] marigold and paprika." A 2024 study published by the National Library of Medicine supports this, stating: "We found that paprika improved the color of the egg yolks and affected the hens' blood cholesterol levels in different ways."
The shade of a yolk is mainly determined by carotenoids found in maize, marigold, peppers, and carrots. The eggshell colour depends on the breed of hen: white hens lay white eggs, brown hens lay brown eggs.
What Really Matters: The Stamp on the Shell
According to British Lion Eggs, there is no nutritional difference between white and brown shelled eggs. What is far more significant is the code stamped on the shell. Organic eggs carry a 0, free-range eggs a 1, barn eggs a 2, and eggs from caged hens a 3 — although all major supermarkets no longer stock caged hen eggs.
Ultimately, neither shell colour nor yolk shade reveals anything about the hen's welfare or the egg's quality. The switch to white eggs is more cost-effective for supermarkets like Sainsbury's and may also be more environmentally friendly.
