How a Swedish scientist turned humble oats into a global dairy-free phenomenon

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

In short: Oat milk has rapidly transformed from a niche Swedish invention into a multi-billion dollar industry. By mimicking the creamy texture and foaming properties of dairy, it has captured the attention of baristas and consumers alike, driven by a unique blend of environmental sustainability and shifting dietary values.

Developed in the 1990s by food scientist Rickard Öste at Lund University in Sweden, oat milk was born from research into lactose intolerance and sustainable food systems. Öste, who later founded the industry pioneer Oatly, sought to create a plant-based alternative that could serve as a viable substitute for cow's milk. While soy and almond milks have longer histories, oat milk’s rise has been meteoric. In the United States, retail sales surged from $4.4 million in 2017 to $213 million by 2020, eventually establishing it as the second most consumed plant milk after almond milk.

The production process is a feat of food engineering. Because raw oat grains are indigestible, they must be milled, soaked, and ground into a slurry. To achieve the desired consistency, manufacturers use enzymes and heat to break down starch—which makes up 50–60% of the grain—into smaller polysaccharides. This prevents the mixture from gelatinizing during high-temperature treatments like pasteurization. The liquid is then separated from the solid byproduct through filtration and centrifugation. Because unfortified oat milk lacks the nutritional profile of dairy, producers add essential micronutrients such as calcium, vitamin D, and vitamin A to ensure it remains a functional substitute.

Consumer adoption is largely fueled by environmental and ethical considerations. Oat milk production requires significantly less land and water than dairy or almond milk, using roughly 1/15th the water of cow's milk. Furthermore, its ability to foam and mix well with coffee—balancing espresso acidity without requiring excessive steaming—has made it a favorite in coffee shops. As of 2023, the global market reached a value of $3.7 billion, reflecting a sustained annual growth rate of 11.5% as younger demographics increasingly align their purchasing habits with personal values regarding animal welfare and sustainability.

Despite its popularity, oat milk remains a distinct nutritional profile compared to bovine milk. While it contains dietary fiber—a component absent in cow's milk—it provides only about 40% of the protein found in dairy. Its glycemic index sits at 60, compared to 47 for cow's milk. Nevertheless, its success demonstrates how modern food science can bridge the gap between traditional dietary staples and the growing demand for plant-based alternatives that do not sacrifice texture or taste.

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