Uses for skim milk before it was marketed as a nonfat diet product: Hog slop and wool.

Hog Slop and Turtlenecks: Skim Milk’s Unlikely Transition From Animal Feed to Diet Product

Hog Slop and Turtlenecks: Skim Milk’s Unlikely Transition From Animal Feed to Diet Product

What to eat. What not to eat.
Feb. 2 2014 11:47 PM

Would You Wear a Sweater Made From Milk?

Yeah, people in the ’40s didn’t either.

(Continued from Page 1)

The most dramatic transformation of casein was its reincarnation as an object of high fashion. In 1936, Italian chemists developed a process to make a wool-like fabric from casein, and soon an Italian textile firm began to produce thousands of pounds a day of the product, called “lanital.” By 1938, two USDA Bureau of Dairy Industry scientists applied for patents for its manufacture in the United States. The National Dairy Products Corp. began commercial production of casein wool bearing the trade name “aralac” in 1941. Casein fibers soon replaced fur in hats and were used to upholster car seats. In 1939 and 1941, casein fabrics were at the center of fashion reviews in New York City.


“Milk wool” symbolized chemurgists’ modernist vision. In casein fibers, scientific innovation seemed to trump natural limits; bizarrely, cows could produce wool! Food consumers might have been ambivalent about artificial flavors in their foods, but in fashion, artifice signified novelty and originality. Synthetic fibers could achieve drape and colors that natural cloth and dyes could not.

Big ideas about casein spun by the press, however, loomed larger than actual production of casein fibers. Manufacturers never devoted more than 4 or 5 percent of casein to fabric production. By 1948, even National Dairy Products Corp., the first company to make casein wool in the United States, discontinued making casein fiber.


While the vision of agrarian modernity promoted by chemists and industrialists for casein was never fully actualized, World War II successfully reincarnated skim milk from a locally utilized byproduct into one with national and international appeal. Skim milk entered World War II before American soldiers did. The U.S. secretary of agriculture asked for expanded production from dairy farmers in July 1941, months before the attack on Pearl Harbor. Dairy products quickly became essential to the lend-lease and war relief programs. Whereas evaporated milk was the preferred relief food during and after World War I, dried milk powder’s transportability and long shelf life gave it the favored spot in the lend-lease formulary. By 1941, the federal government asked for 200 million pounds of dry skim milk powder for America’s allies. Dried skim milk manufacturers struggled to keep pace with the unprecedented demand.

But as the war drew to a close, marketing, not production concerns, loomed large in the minds of dried milk companies. Manufacturers recognized that producing dried nonfat milk at record levels would not ensure the industry’s success. Without a market for the product, dairy farmers would once again be faced with the surpluses that had plagued them in the 1930s. Thus, milk companies adopted a new strategy to promote skim milk in the postwar era: selling it on its own merits.

As prices for whole milk increased in the late 1940s, milk dealers in the fluid milk market, as well as dried milk dealers, turned to skim milk as a promising product in its own right. Though many consumers were skeptical about the value of skim milk, dairy companies enticed them with promises that drinking skim milk would help them lose weight. Milk dealers secured the backing of physicians. As had been the case for certified and pasteurized milk in the Progressive Era, the recommendations of physicians gave skim milk newfound legitimacy. Although physicians had long suggested nonfat milk to patients who had difficulty digesting fats or were elderly, weight-conscious consumers became the largest sector of the skim milk market in the 1950s. Emphasizing skim milk’s role in promoting slenderness transformed skim milk’s reputation as a low-cost relief food to one that high-income dieters would embrace.

The desire to diet drew largely from consequences of postwar abundance. Equipped with deep-freezers and family-size refrigerators, Americans had access to a greater quantity of food at home than ever before. As Americans settled into the sedentary culture of drive-ins and television entertainment, many gained weight. Skim milk held a prominent place on the dieters’ menu. Gayelord Hauser’s Live Younger, Live Longer, which topped the best-sellers’ list in 1951, called skim milk a “wonder food.” Diets printed in women’s magazines and even in Hoard’s Dairyman recommended the food. A Sealtest skim milk offer gave consumers the chance to get a new bathroom scale with a proof-of-purchase tag. As concerns about cholesterol and heart disease intensified, the idea of skim milk as a healthy food would only become more entrenched.

One of the most striking features of dairy companies’ push on skim milk as a diet food was the feminization of the product. In the past, milk marketers had entreated women as mothers to buy milk to ensure children’s health and safety, but dealers seeking skim milk buyers courted women as an adult market. Skim milk advertisements emphasized not innocence and wholesomeness, but svelte sexuality. A 1950 advertisement printed in Milk Dealer, for instance, encouraged milk salesmen to pursue the low-fat milk market by picturing a bikini-clad beauty and the words “She Can Be Yours.” Advertisements for Sealtest skim milk suggested that by sipping skim milk, an overweight woman could lose pounds, regain a youthful complexion, and win back her man. Selling skim milk as a potion of slenderness, and thereby romance, certainly gave it more prestige than it carried as a mere byproduct of butter-making or as hog slop.

Excerpted from Pure and Modern Milk: An Environmental History Since 1900 by Kendra Smith-Howard, out now from Oxford University Press.

Kendra Smith-Howard is an assistant professor of history at the University at Albany, State University of New York.