Pasteurization—the method of destroying harmful bacteria through heat—solved that problem, but it wasn’t an immediate solution. For starters, Louis Pasteur’s 1864 innovation first made its impact on wine and beer. It took 20 years until a German chemist named Frans von Soxhlet proposed applying the process to milk. In 1908, Chicago became the first municipality to require pasteurization for all milk sold. On a state level, Michigan became the first to enact a similar law in 1948. What had been a state-by-state regulation finally became a national standard in 1987.

The ad says Sir Hans Sloane’s Milk Chocolate, prepared after the original recipe, by Cadbury Brothers, London and Birmingham.

Label for Cadbury’s milk chocolate drink featuring a recipe credited to Sloane, Natural History Museum, circa 1850. (Source: Wikimedia Commons)

Previous centuries weren’t without innovations beyond pasteurization, however. In fact, one 17th century development created what continues to be a favorite of kids and grownups alike: chocolate milk. In the late 1600s, Irish botanist Hans Sloane traveled to Jamaica, where the locals gave him a drink of cocoa and water. He found it nauseating, and instead added milk and sugar to make it more palatable. While it’s uncertain that he was the first to ever combine milk and chocolate, Sloane brought his recipe back to England where it was manufactured and sold as medicine.

A black and white photo of an early 20th century drugstore display showing model cows and a miniature farm with signs for Klim powdered milk.

A display of Klim Powdered Milk in a drugstore window in Washington, DC, 1909. (Source: Wikimedia Commons)

By the turn of the 19th century, a Russian scientist had developed the technology to create powdered milk, which retains all of milk’s nutrients at a fraction of its weight. Then and now, this innovation created a nutritious way to give milk portability and extended shelf life, qualities that continue to make powdered milk a common item in U.N. food supplies as well as a choice for hikers and outdoor enthusiasts.

The Civil War sparked further advancement of milk’s role in our diets. Newly invented condensed milk, with 60% of its water removed and sweetener added, became part of the Union Army’s food supply. It was followed in the market shortly after by unsweetened evaporated milk.

Progress in making milk safer and more efficient to produce led to a 20th century full of growth and development that made it the go-to beverage in the American diet. And in the latter part of the century, Organic Valley helped lead the way.

A black and white photo of children in old fashioned clothing sitting at tables being served food by a woman. (Source: Library of Congress)

Members of a mothers’ committee serve lunch at a nursery school, 1942.

20th Century: School Lunches and the Organic Rule

Once again it was war—World War II in particular—that helped transform milk in the U.S. As soldiers were drafted into service, physicians noticed a pattern of malnutrition in many of the young men who had grown up impoverished during the Depression. In addition, while food rationing was an indelible part of the home effort, milk was not rationed, and consumption jumped. When the war ended, there emerged an ideal solution to address both children’s nutrition and the boon of milk production: school lunches, with milk as part of the meal.

Some cities were already addressing malnutrition with federally supported milk programs that began in 1940. In 1946, President Harry S. Truman signed what is now known as the National School Lunch Act. Eight years later, the Special Milk Program helped bring another 400 million pints of milk into American schools in addition to what had already been part of the school lunch menu. The rules have evolved over the decades, but the end result is that milk in schools is now as familiar as reading, writing, and arithmetic.

Check out our Brief History of School Lunch for more on the evolution of this important program.

A black and white image of young children drinking milk from a tray on a table outdoors.

Children drinking milk at a Farm Security Administration farm workers' camp in Yuba City, California, 1940. (Source: Library of Congress)

Even with all that innovation, more developments ensured that milk was a smart choice for a healthy diet. Organic farming emerged in the 20th century to counter rapidly changing agricultural practices. Organic Valley was one of a few organic businesses in the ’70s and ’80s that, along with strong consumer voices, motivated the federal government to create national standards for organic farming—the USDA Organic label. That seal was founded on the law that members of Organic Valley helped advise, the Organic Foods Production Act of 1990.

Once the law was in place, in order to call something “organic” now meant meeting strict farming standards, some of which Organic Valley had already been surpassing, such as time on the pasture. Today, Organic Valley cows get an average of 55 percent of their diet from fresh pasture during the grazing season, well beyond the 30 percent required for the USDA Organic label.

There are healthy reasons to make those choices, and science backs it up. Studies show that when cows spend more time on pasture, the cows are happier living the way they’re meant to, their milk tastes better, and provides more nutrition.

Late-20th-Century: Milk Leaps Forward

Milk’s innovation continues to this day. Of particular note is ultra-filtered milk. With ultra-filtration, milk is mechanically filtered to create a higher concentration of protein while separating and removing some lactose and water. The result is low-sugar, high-protein milk. The technology itself is decades old, developed to treat whey, but it has emerged to create milk that packs a nutritious punch. It’s now allowed for use in cheese production, too.

On the flavor front, it’s no longer just traditional white and chocolate with the occasional guest appearance by strawberry—and milk drinkers are loving the options. One of the top-growing segments of the milk market is flavored milk, and these days that can be any a number of flavors: banana, root beer, “tutti-frutti,” plus more grown-up flavors such as coffee and vanilla, and holiday favorites such as chocolate mint and pumpkin spice.

From pasteurization to powdered milk to ultra-filtered milk to pumpkin spice milk, 6 billion people’s go-to beverage is light years away from its curious beginnings. Much has changed, but one thing remains the same: Milk is a tasty source of nutrition.

After all, if something’s been around for 10,000 years, it must have been a good idea—whoever had it first.

A black and white image of a man drinking from an old fashioned milk bottle.

Oil field worker drinking a bottle of milk at lunch, Kilgore, Texas, 1939 (Source: Library of Congress)

Want to dig deeper into the fascinating history of milk?

We recommend checking out Milk!: A 10,000-Year Food Fracas by Mark Kurlansky (Bloomsbury Publishing, 2018).

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