From Pig Feed to Pantry Staple: The Surprising History of Skimmed Milk

Food & Drink · Published 3 October 2026 Swipe more like this →

In short: Once dismissed as mere fodder for fattening pigs, skimmed milk has undergone a remarkable transformation in our modern diet. Today, this low-fat liquid is a global staple, but its identity—and even its packaging color—varies wildly depending on whether you are shopping in a British supermarket or an American grocery store.

At its core, skimmed milk is simply whole milk that has been stripped of its fat content. The process is mechanical rather than chemical; most producers use a centrifuge to spin whole milk at high speeds, forcing the fat droplets to separate from the liquid. The result is a product that typically contains between 0.1% and 0.3% fat, a stark contrast to the 3% to 4% fat found in whole milk.

Historically, this byproduct was not intended for human consumption. In the past, it was highly valued as a supplement for growing pigs, praised for providing complete protein and making feed more palatable. The shift toward human consumption led to standardized marketing, though the systems used to identify these products are far from universal. In the United Kingdom, a color-coding system for plastic bottles was proposed in 1998 by John Morris of the British Retail Consortium, drawing inspiration from cream packaging. Under this system, red is the standard color for skimmed milk, while blue denotes whole milk and green signifies semi-skimmed varieties.

The experience of buying milk differs significantly across the Atlantic. In the United States, milk is marketed primarily by its fat percentage, with 0% non-fat milk being the equivalent of the UK's skimmed variety. Unlike the relatively consistent British system, American color-coding for milk caps and packaging is inconsistent. While red often denotes whole milk and blue is frequently used for 2% milk, the colors for 1% and skimmed milk vary by region and individual dairy, appearing in shades as diverse as purple, yellow, pink, or light blue. This lack of uniformity highlights how regional marketing traditions have shaped our perception of a product that was once relegated to the farmyard.

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