A Glass of Milk Hides a History of Evolution and Empire

A glass of milk hides a history of evolution and empire, argues an Oxford-backed short film released September 18, 2026, even though most people see it as the plainest drink around.

The film turns an everyday food into a lesson on how history decides what counts as normal, healthy, or natural to eat.

The film, called Five Surprising Things You Probably Didn't Know About Milk, comes from the British Broadcasting Corporation (BBC) and its short-video channel, BBC Ideas, working with the University of Oxford's Social Sciences Division.

JC Niala, deputy director of the History of Science Museum at Oxford, and Johanna Zetterström-Sharp, an associate professor of heritage studies at University College London, lead the research behind it.

Their project, called Milking It, studies how people in Britain and Kenya live with dairy, with funding from the Arts and Humanities Research Council, a British government research funder.

The work started with an old photograph of Guernsey cows, a British dairy breed, loaded onto a plane to East Africa in the 1950s, while Britain still ruled Kenya.

Niala noticed that Kenya already had cattle of its own, which led the team to ask why certain breeds of cattle, and certain kinds of milk, came to rank above others.

The project website does not say who shipped the cows or why.

Instead, the team traces how certain ideas about milk came to feel official, desirable, and even natural.

Milk's story starts far earlier than empire, deep inside the human body.

About 65 percent of people lose much of their ability to digest lactose, the natural sugar in milk, after infancy, a US government health guide reports.

People who keep that ability for life inherited DNA differences that keep the body making lactase, the enzyme that breaks lactose down.

Only about five percent of people with Northern European roots lose the ability, a far lower share than among people of East Asian or West African descent.

A 2022 study in the journal Nature, led by Richard Evershed of the University of Bristol, tested the common idea that those genes spread simply because milk drinkers did better than people who could not digest milk.

The team examined milk fat left inside about 7,000 ancient pots from more than 550 sites across Europe.

Europeans used milk widely for thousands of years, but Evershed's team concluded that famine and disease, not milk drinking alone, pushed the gene to spread, since milk could sicken people who could not digest it during those hard times.

Eastern Africa tells a different story.

Herders in present-day Sudan and Kenya drank milk at least 6,000 years ago, according to a 2021 study that found milk proteins in hardened plaque on ancient teeth.

Madeleine Bleasdale, the study's lead author, and her team found that those herders lacked the genetic change that helps adults digest milk.

Fermented foods that hold less lactose than fresh milk, such as yogurt, may have let them drink it anyway, the Max Planck Institute suggested.

One herder site in southern Kenya showed milk drinking between 3,600 and 3,200 years ago, long before British rule, which helps explain why the 1950s cattle flight puzzled Niala.

The Milking It team also talks with farmers, cheesemakers, nutritionists, and historians, and shares those conversations on a podcast called Milk on the Move.

Niala and Zetterström-Sharp treat milk as a bundle of opposites: intimate and industrial, old heritage and new invention, nourishment and a product to sell.

The Oxford page announcing the film reports no new data yet from the fieldwork in Britain or Kenya.

For now, the film asks viewers to look twice at a drink they thought they already understood.