The science of supermarket eggs - and why you've been buying the wrong ones all along

Science of supermarket eggs shows consumer beliefs about color and welfare may be misguided. Sainsbury's plans to stop selling brown eggs under its own-brand and switch to white-shell eggs after research suggested white eggs have lower environmental impact. White hens are smaller and require less feed for the same output, yielding an estimated 12.7% reduction in carbon emissions compared with brown hens. The shift rekindles a long debate over shell color, welfare and taste, noting that Britain has long favored brown eggs, while the US predominantly sells white eggs. The piece traces historical perceptions and market preferences shaping British shelves.