One of the UK’s biggest supermarket chains is gradually phasing out brown eggs from its own brand range and replacing them with white eggs. Sainsbury’s decision is not related to the appearance of the eggs, but to the environmental impact of production.
According to the portal, and according to the company, an assessment of the products’ life cycle concluded that the white eggs present in its supply chain in 2024 had a 12.7% lower carbon footprint, per kilogram, than that of brown eggs.
More efficient chickens
The difference is in chickens that normally lay white eggs. These birds tend to consume less feed to produce the same amount of eggs and can remain productive for longer.
While these differences may seem small, they can have an impact when applied to a large supply chain. Less feed and more production time mean a reduction in emissions associated with the process.
According to ZME Science, white eggs were once common in Britain, but lost shelf space after consumers switched to brown eggs in the 1970s and 1980s.
White eggs were far from the shelves
For many years, white eggs were mostly used in catering and the food industry, while brown eggs dominated domestic consumption. Consumer preferences ended up shaping what supermarkets offered for sale.
Now, Sainsbury’s wants to reposition egg whites as an alternative with a lower carbon footprint. The chain hopes consumers will gradually accept the change, despite the deep-rooted habit of associating brown eggs with a more traditional choice.
The color of the shell, however, does not alone determine the nutritional quality of the egg. What changes is mainly the breed or lineage of the chicken and the efficiency of production.
Association also talks about costs
The British Free-Range Egg Producers Association considers that the decision should not be seen solely as a climate measure. According to the entity, the greater efficiency of these birds can also reduce production costs.
This means that economic factors may also have weighed on the supermarket’s decision. For now, it is unclear whether white eggs will reach consumers at lower prices or whether the change will allow the chain to increase margins.
There are also possible differences in terms of animal welfare. Some commercial strains of white-feathered chickens have a lower risk of feather pecking and aggressive behavior.
Change may require adaptation
Replacing brown eggs with white ones may seem simple, but eating habits are difficult to change. Many consumers always buy the same products and may find change in such a basic category strange.
Still, the decision shows how seemingly small choices can have an environmental impact when applied on a large scale. The case of eggs adds to other changes in agriculture and food motivated by reducing emissions.
An example cited is rice. In traditional rice fields, the fields are flooded during much of the growing cycle, creating conditions that favor the production of methane, a gas with a strong greenhouse effect.
Food and climate footprint
New rice varieties and direct seeding methods seek to reduce some of this impact by using less water and reducing emissions. However, these changes require adaptation from producers, new equipment and changes in markets.
The same happens with animal breeds or agricultural crops with a lower carbon footprint. The transition can bring environmental benefits, but it is not always simple or immediate.
In the case of eggs, the focus on white eggs shows that even common everyday products can enter the climate discussion. For consumers, the difference may just be in the color of the shell; for producers and supermarkets, it can represent a relevant change in the way they reduce emissions.
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