Yogurt: History and Origins
Yogurt has no inventor and no birthday. Like most fermented foods, it almost certainly began by accident: among the early herding peoples of Central Asia, Mesopotamia, and Anatolia, fresh milk carried in warm conditions soured naturally as wild bacteria multiplied, turning into a thick, tangy food that kept far better than the milk it came from. That happy accident was probably repeated independently in many places over thousands of years. This article traces what the historical and scientific record actually supports: yogurt's deep roots among Neolithic herders; the Turkish word yoğurt and what it literally means; yogurt's long life in the cooking of the Middle East, the Balkans, the Caucasus, and South Asia; the scientific era, when Stamen Grigorov identified the key bacterium in 1905 and Élie Metchnikoff turned yogurt into a celebrated health food; and the commercial era, when Isaac Carasso founded Danone in 1919 and yogurt eventually crossed the Atlantic. Where the evidence is firm we say so; where a claim is folklore, a contested origin, or an untested hypothesis, we label it plainly.
Table of Contents
- Ancient Roots: Milk, Herders, and Accident
- What "Yogurt" Means: A Turkish Word
- A Food of Many Cuisines
- The Science Begins: Grigorov, 1905
- Metchnikoff and the Longevity Hypothesis
- Commercialization: Carasso and Danone, 1919
- Yogurt Comes to America
- Cultural and Traditional Significance
- Research Papers and References
- Connections
Ancient Roots: Milk, Herders, and Accident
Yogurt is one of the oldest prepared foods we still eat, and its origin is best told not as an invention but as a consequence of how people once lived. The most widely cited account holds that yogurt was probably first made by Neolithic peoples in Central Asia and Mesopotamia, somewhere around 5,000 BCE, at roughly the time the first milk-producing animals were domesticated. The crucial word is probably: there is no single founding event to point to, and most historians treat yogurt as something that arose by chance and was very likely discovered independently in many different places and times across the milk-drinking world.
The mechanism is easy to picture and requires no genius. Herders across the dry belt from Anatolia through Mesopotamia and into Central Asia stored and carried milk in containers made from animal skins or stomachs. In a warm climate, milk left in such a vessel is quickly colonized by naturally occurring lactic-acid bacteria, which convert its sugar into acid, thicken it, and curdle it into something tangy and far more stable than fresh milk. For a culture without refrigeration this was transformative: souring both preserved the milk and, by consuming much of its lactose, made it easier for many people to digest. Yogurt, in this sense, was less a recipe than a regularly repeated natural event that herding peoples learned to encourage and keep going.
It is worth being precise about the limits of this story. The "5,000 BCE" figure and the Central Asian / Mesopotamian setting are the conventional scholarly summary, not a precisely dated archaeological find tied to one site, and yogurt itself — a soft, perishable food — leaves little direct trace in the ground. What the wider evidence does firmly support is that fermented-milk traditions are genuinely ancient and were spread across a vast region: Europe, large parts of Africa, the Middle East, the Indian subcontinent, and Central Asia all developed their own soured-milk foods. Yogurt is best understood as one deeply rooted branch of that worldwide family.
What "Yogurt" Means: A Turkish Word
Unlike its disputed cousins, yogurt has a name whose origin is reasonably well agreed upon: it comes from Ottoman Turkish yoğurt. Reference works connect the word to the Turkish verb yoğurmak, meaning roughly "to knead," and by extension "to thicken" or "to be curdled or coagulated." The link is satisfying because it describes the food itself: making and tending yogurt involves working soured milk until it sets into a thick, smooth mass, so the name effectively means "the thickened" or "the curdled" thing. The deeper root is older still — an Old Turkic form usually given as yuġrut — placing the word firmly in the Turkic-speaking world of Central Asia and Anatolia.
The word is also old in writing, which helps anchor the food's history. Yogurt is mentioned in two celebrated eleventh-century Turkic texts: the Dīwān Lughāt al-Turk, the great dictionary of Turkic compiled by Mahmud al-Kashgari in the 1070s, and the Kutadgu Bilig of Yusuf Has Hajib, both of which describe its use among nomadic Turkic peoples. These are not legends but real, datable documents, and they show that yogurt was a well-known, named food among medieval Turks roughly a thousand years ago.
From Turkish, the word travelled outward as the food and its reputation spread — into the languages of the Balkans and beyond, and eventually into Western European languages in the modern era. The English spelling has never fully settled (one still sees yogurt, yoghurt, and yoghourt), a small reminder that this is a borrowed word for a borrowed food, carried into English only within roughly the last century or so.
A Food of Many Cuisines
Long before any laboratory looked at it, yogurt was woven into the everyday cooking of a broad sweep of the world. Across the Middle East, the Balkans, the Caucasus, and Central Asia, soured and strained milk became a daily staple: eaten plain, thinned with water and salt into a cooling drink, strained into a thick cheese-like spread, stirred into soups and sauces, or used to marinate and tenderize meat. In hot climates especially, a yogurt-based drink was both refreshment and nourishment, and strained yogurt offered a way to keep dairy edible for longer. These were not specialty items but ordinary food, made at home and renewed batch after batch by saving a little of the previous day's culture to start the next.
The same tradition runs deep in South Asia, where yogurt — known as dahi — is a cornerstone of the cuisine and of daily life across India, Pakistan, Bangladesh, Nepal, and beyond. Dahi is eaten on its own, served as a cooling accompaniment to spiced dishes, churned into the popular yogurt drink lassi (sweet or salted), and used as the base for countless sauces and marinades. Fermented dairy is held in high regard in the region's food culture and traditions; the antiquity and esteem of dahi in South Asian life is well documented, and it remains one of the most widely eaten forms of yogurt in the world.
What this geographic spread tells us is important for understanding yogurt's history: it had no single national home. The Turkish-derived name is genuine and useful, but the food belonged simultaneously to many peoples, each with its own version, vocabulary, and customs. This is exactly what we would expect of something that arose independently from the simple, universal habit of keeping milk — and it is why arguments over which nation "owns" yogurt are, historically, beside the point.
The Science Begins: Grigorov, 1905
For thousands of years people made yogurt without knowing what actually turned the milk. That changed at the start of the twentieth century, and the central figure is a young Bulgarian named Stamen Grigorov (1878–1945). In 1905, while a medical student working in the laboratory of Professor Léon Massol in Geneva, Grigorov examined the microflora of traditional Bulgarian yogurt and identified the rod-shaped bacterium chiefly responsible for its fermentation. He was in his late twenties at the time — an often-noted detail that underscores how young he was when he solved a question as old as the food itself.
The organism Grigorov found was, in recognition of its source, given the Latin name Bacillus bulgaricus — a formal naming generally dated to 1907. Under modern bacterial taxonomy it is now classified as Lactobacillus delbrueckii subsp. bulgaricus, and together with a partner organism it remains one of the two defining cultures of true yogurt to this day. (Grigorov is also remembered for early work on a tuberculosis treatment in the same period, though it is the yogurt bacterium that carries his legacy.)
It is worth separating two things that are easy to blur. Grigorov did not invent yogurt and did not discover that fermented milk was healthful — both were ancient. What he did was identify the specific living agent behind the fermentation, turning a folk practice into something that could be studied, standardized, and eventually reproduced reliably in a factory. That single identification is the hinge between yogurt's long prehistoric life as a household ferment and its modern life as a scientific and industrial product.
Metchnikoff and the Longevity Hypothesis
If Grigorov gave yogurt a microbe, it was Élie Metchnikoff — the Russian-born biologist (also written Ilya Mechnikov), a Nobel laureate of 1908 for his work on immunity — who gave it fame as a health food. Around 1907, in his book The Prolongation of Life: Optimistic Studies, Metchnikoff set out an arresting idea: that aging is driven in part by toxic by-products of harmful bacteria in the large intestine, and that deliberately introducing beneficial lactic-acid bacteria — such as those in soured milk — might displace the harmful microbes and so promote health and a longer life. Influenced by Grigorov's discovery, he pointed to the Bulgarian bacillus in particular.
Metchnikoff buttressed the idea with a famous observation: that certain Bulgarian rural populations were said to include unusually many long-lived people, and he linked their longevity to their habit of eating yogurt. This is the part that must be handled carefully. Metchnikoff's longevity claim was a hypothesis, not an established fact — an informed scientific conjecture connecting two things (yogurt eating and long life) that happened to occur together in the same populations. Correlation of that kind does not prove that the yogurt caused the longevity, and the specific claim that yogurt explains Bulgarian peasants' lifespans has never been demonstrated. This page presents it as the influential idea it was, not as proven science.
Whatever its scientific status, the hypothesis had enormous cultural impact. Coming from a celebrated Nobel laureate, it sparked a wave of interest in soured-milk foods as medicine across Europe in the years before the First World War, helped popularize what we would now call the idea of beneficial gut bacteria, and is widely regarded as a foundational moment for the modern concept of probiotics. Metchnikoff turned yogurt, almost overnight, from a regional staple into a fashionable health food — setting the stage for someone to sell it. The modern, evidence-based picture of what yogurt actually does for digestion and the gut is covered separately in the Yogurt Benefits articles and on the main Yogurt page.
Commercialization: Carasso and Danone, 1919
The bridge from health idea to household product was built by one family. Isaac Carasso (1874–1939) was a member of a Sephardic Jewish family with roots in Ottoman Salonica (modern Thessaloniki), a Balkan world where yogurt was an everyday food. Having settled in Barcelona, Spain, Carasso was aware both of yogurt's Balkan reputation and of the new scientific interest in lactic ferments associated with Metchnikoff. In 1919 he started a small yogurt business there, producing yogurt with carefully selected cultures and selling it, at first, in pharmacies as a healthful product for children with digestive troubles.
The business's name is one of the more charming facts in food history. Carasso named it Danone after his young son Daniel — Danone deriving from an affectionate Catalan diminutive, roughly "little Daniel." That son, Daniel Carasso, would go on to spend his life in the yogurt trade and live to 103, carrying the family enterprise across borders. The small Barcelona shop of 1919 was the seed of what became one of the largest food companies in the world.
The next move was to France. Daniel Carasso established the business in Paris in the early 1930s, and from there the Danone name and its yogurt spread through Western Europe. The crucial point for yogurt's global history is that the Carassos married three things that had previously been separate: the ancient food, the modern science of identified beneficial cultures, and industrial production and branding. That combination is what carried yogurt out of its traditional homelands and into the modern supermarket.
Yogurt Comes to America
Yogurt reached the United States along two tracks, both rooted in immigrant communities that had eaten it for generations. The earlier of the two was the work of an Armenian immigrant family, the Colombosians. Sarkis and Rose Colombosian established a yogurt-making business — remembered as "Colombo & Sons Creamery" — in Andover, Massachusetts, in 1929, drawing on traditional Armenian methods for making cultured milk. Their Colombo yogurt is widely credited as the first yogurt produced and sold commercially in the United States. In its early decades it remained a regional, largely ethnic product of New England; the brand endured for the rest of the century before passing into larger corporate hands.
The second, and ultimately more famous, track was Dannon — the American arm of Carasso's Danone. With Europe at war, Daniel Carasso came to the United States in 1942, partnering with the businessman Joe Metzger and his son. They acquired a small yogurt operation in the Bronx, New York, and continued making yogurt with the family's cultures, anglicizing the brand from Danone to Dannon. At first Dannon, too, sold mainly to immigrant customers who already knew yogurt; for a while a fleet of trucks supplied New York's groceries and delicatessens.
Turning yogurt into a mainstream American food took decades and some clever marketing — including, famously, adding fruit on the bottom to soften its tart, unfamiliar taste for American palates. Through the second half of the twentieth century yogurt shed its image as a strange ethnic specialty and became an everyday staple of the American refrigerator, and later a vehicle for the modern probiotic and Greek-style yogurt booms. But the foundation was laid by these immigrant families — Armenian and Sephardic — who simply brought a food from home and, in time, taught a continent to eat it.
Cultural and Traditional Significance
Across its long life yogurt has meant more than nourishment. In its many homelands it was a practical technology of survival — the way herding and farming peoples preserved milk and stretched a perishable resource — and at the same time a food woven into hospitality, religion, and daily ritual, from the cooling drinks of the Middle East and Central Asia to the revered dahi of South Asian kitchens. Because each batch was started from the last, a household's yogurt culture could be, in a real sense, an inheritance, kept alive and passed along like a small living heirloom.
Yogurt has also carried a centuries-old reputation as a health food, and here the history asks for care. Traditional communities prized yogurt for digestion and well-being, and Metchnikoff's early-twentieth-century work gave that folk reputation a scientific glamour — but a long tradition of being considered healthful is a reason to study a food, not proof of any particular medical effect. Metchnikoff's longevity claim, in particular, was a hypothesis that has not been borne out as stated. The genuine, modern, evidence-based account of yogurt's benefits — what controlled research actually shows about the gut microbiome, lactose digestion, and more — is set out in the Yogurt Benefits articles and on the main Yogurt page.
What the history reliably leaves us is a story about people rather than a single inventor: countless herding and farming communities, across a huge span of Eurasia, independently turning milk into something better and longer-lasting; a Turkish word that captured the act of thickening it; a young scientist who finally named the microbe at work; a famous biologist who made it briefly into a medicine of legend; and a handful of immigrant families who carried an ancient food into the modern, industrial, global age.
Research Papers and References
The list below combines peer-reviewed and historical-review sources on yogurt's microbiology and origins with curated PubMed topic-search links and reputable encyclopedic references for its cultural and commercial history. Where a claim in this article is a hypothesis (Metchnikoff's longevity argument) or a conventional summary rather than a precisely dated find (the "5,000 BCE" origin), it is labelled as such in the text rather than presented as settled fact. Author names, titles, and journals are given as plain text; only the stable DOI, PMID, or archive link is hyperlinked, and each opens in a new tab.
- Fisberg M, Machado R. History of yogurt and current patterns of consumption. Nutrition Reviews. 2015;73(Suppl 1):4-7. — doi:10.1093/nutrit/nuv020 · PMID: 26175483
- Weerathilake WADV, Rasika DMD, Ruwanmali JKU, Munasinghe MADD. The evolution, processing, varieties and health benefits of yogurt. International Journal of Scientific and Research Publications. 2014;4(4):1-10. — ijsrp.org (2014)
- Mackowiak PA. Recycling Metchnikoff: probiotics, the intestinal microbiome and the quest for long life. Frontiers in Public Health. 2013;1:52. — doi:10.3389/fpubh.2013.00052 · PMID: 24350221
- Anukam KC, Reid G. Probiotics: 100 years (1907-2007) after Elie Metchnikoff's observation. In: Communicating Current Research and Educational Topics and Trends in Applied Microbiology. 2007;1:466-474. — PubMed: Metchnikoff probiotics history
- Gueimonde M, Salminen S. The role of yogurt in food-based dietary guidelines. Nutrition Reviews. 2015;73(Suppl 1):8-14. — doi:10.1093/nutrit/nuv016 · PMID: 26175484
- Yogurt history, etymology, and origins — PubMed: yogurt history and origin of fermented milk
- Lactobacillus delbrueckii subsp. bulgaricus in yogurt fermentation — PubMed: Lactobacillus bulgaricus and yogurt fermentation
- Dahi (Indian yogurt) microbiology and traditional fermentation — PubMed: dahi traditional fermented milk of India
- Yogurt. In: Encyclopaedia Britannica (origin, etymology, and history). — britannica.com/topic/yogurt
External Authoritative Resources
- Encyclopaedia Britannica — Yogurt
- Stamen Grigorov — discoverer of the yogurt bacterium (1905)
- PubMed — All research on yogurt