Margarine vs Butter: The Spread That Was Demonised Twice
Invented to feed the poor, banned to protect the dairy trade, then sold as heart-healthy — and undone by the very fat that was meant to save us.
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In a kitchen in the 1960s an American housewife is doing something faintly absurd. She has bought a bag of white, lard-coloured margarine, and inside the bag is a small capsule of orange dye, and she is kneading the capsule until it bursts and works its colour through the mass, turning the pale grease a convincing butter-yellow. She is doing this because the law of her state forbids the margarine from being sold already yellow. A dairy lobby, decades earlier, had persuaded legislators that yellow margarine was a fraud upon honest butter, and so the colour had to be added at home, by hand, as a small daily ritual of humiliation designed to make the cheaper spread less appealing. Within her lifetime that same margarine would be recommended by her doctor as the healthy choice, better for her heart than the butter it imitated — and then, before she died, it would be condemned all over again for containing a fat worse than butter’s. Few foods have been so thoroughly and so contradictorily demonised. Margarine was attacked twice, from opposite directions, and it was innocent both times in different ways.
The kernel: a prize, a French chemist, and a cheap fat for the poor
The true history begins with hunger and a competition. In 1869 the French chemist Hippolyte Mège-Mouriès patented a butter substitute he had developed in response to a prize offered by Emperor Napoleon III, who wanted a cheap, stable fat to feed the French army and the urban poor at a time when real butter was expensive and spoiled quickly. Mège-Mouriès churned beef tallow with milk and other ingredients into a spreadable substance he called oleomargarine, after the pearly, lustrous look of one of its fatty acids — the Greek margaron, a pearl. It was, from the very first, a food of thrift, invented to put fat on the bread of people who could not afford the dairy version.
That origin matters, because it set the terms of the first war. Margarine was cheap, and cheapness was precisely its offence. It threatened a powerful, organised and politically connected industry: dairy farming. And so the first demonisation of margarine was not about health at all — the health science that would later tangle everything up did not yet exist. It was about money and protectionism, dressed up as a defence of purity and honesty.
The first demonisation: the war of the dairy lobby
What the American dairy interests did to margarine in the late nineteenth and early twentieth centuries is one of the strangest chapters in the history of food regulation, and it is thoroughly documented. As margarine spread across the United States in the 1880s, the dairy lobby mounted a ferocious campaign to strangle it. Congress passed the Margarine Act of 1886, imposing a federal tax and licensing requirements. Individual states went much further. Several banned margarine outright for periods. And a cluster of states hit upon a peculiarly vindictive tactic: the colour laws.
Butter is yellow; margarine, left to itself, is roughly white. To sell it, manufacturers dyed it yellow so it would look like the thing it replaced — and the dairy lobby cried fraud. Some states responded by banning yellow margarine entirely, forcing it to be sold in its natural pale state so that no one could mistake it for butter. Others went to a gleeful extreme: laws in states such as Vermont, New Hampshire and West Virginia at one point required margarine to be dyed pink, an unappetising hue meant to kill the appetite outright, until the U.S. Supreme Court struck the pink laws down. Where colouring was simply forbidden, the manufacturers began supplying the dye separately, in a capsule, and the housewife did the colouring herself at the kitchen table — the small absurd ritual with which this story opened. These restrictions were astonishingly durable. Wisconsin, the great dairy state, did not repeal its ban on yellow margarine until 1967. For nearly a century, one spread was legally persecuted to protect the sales of another.
Britain took a gentler but revealing path. There the colour wars never reached the American pitch, and margarine instead became a fixture of thrift and, later, of survival. Through both world wars, as German U-boats throttled the shipping lanes that brought butter and other fats to a hungry island, margarine was rationed and relied upon as a national staple; the Ministry of Food leant on it to keep fat on the nation’s bread when the dairy version was scarce and dear. A food born to feed the French poor became, across the Channel, a quiet instrument of wartime endurance. Its reputation in Britain was always more a matter of class and money than of fraud, but the underlying fact was the same on both sides of the Atlantic: margarine was the fat you ate when you could not afford, or could not obtain, the real thing.
None of this had anything to do with whether margarine was good or bad for the body. It was a commercial war, waged with the language of adulteration and honesty because that language was available and effective. The first time margarine was demonised, it was demonised for being cheap competition — and the “fraud” it was accused of was the crime of looking like butter.
The great reversal: margarine becomes the healthy choice
Then the science arrived, and it flipped the whole board. From the 1950s onward, the diet–heart hypothesis took hold of Western medicine: the idea that saturated fat raised blood cholesterol and drove the century’s epidemic of heart disease. Butter is almost pure saturated animal fat, and so butter went from wholesome staple to dietary villain — the same fate that befell the egg and its yolk in exactly this period. And margarine, which by now was made not from beef tallow but from cheaper vegetable oils, was reborn as the heart-conscious alternative. It was polyunsaturated, it was plant-based, it was low in the saturated fat everyone had learnt to fear. Doctors recommended it. Government guidance nudged toward it. The margarine tubs grew little hearts and health claims on their lids.
The persecuted thrift-food of the immigrant and the poor had become the enlightened choice of the health-conscious middle class. For a few decades, swapping butter for margarine was one of the simplest things a worried person could do to feel they were protecting their heart. It was cheap, it was virtuous, and the doctors were behind it. The transformation was complete, and it felt like progress. It was, unfortunately, built on a hidden flaw.
The fork: the fat that was supposed to save us
Here is the precise point where the well-meaning science forked off a cliff, and it turns on a single industrial process: hydrogenation.
Vegetable oils are liquid at room temperature. To make a solid, spreadable, butter-like margarine out of them, manufacturers used partial hydrogenation — bubbling hydrogen through the oil in the presence of a metal catalyst to stiffen it. This process created a class of fats that barely existed in nature: trans fats. Through the 1980s, as the campaign against saturated fat peaked, hardened margarines packed with partially hydrogenated oil were sold as the healthy spread, and trans fats poured into the food supply — not only in margarine but in shortening, fried food, biscuits and pastries.
And then, through the 1990s, the evidence came in that these trans fats were worse for the heart than the saturated fat they had been brought in to replace. Landmark epidemiological work, much of it from Harvard researchers led by Walter Willett drawing on the enormous Nurses’ Health Study, found that trans fats did something butter did not: they raised LDL cholesterol and lowered the protective HDL, a double blow to cardiovascular health. A major analysis published in the New England Journal of Medicine in 2006 estimated that trans fats were among the most harmful fats in the diet gram for gram. The margarine that had been prescribed as the heart-healthy choice had, in many of its formulations, been quietly delivering the single worst fat for the heart that food science had yet identified.
The consequences were sweeping. Denmark restricted industrial trans fats in 2003. New York City banned them from restaurants in 2006. In 2015 the U.S. Food and Drug Administration ruled that partially hydrogenated oils were no longer “generally recognised as safe,” with a compliance deadline that effectively removed them from the American food supply by 2018–2020. The World Health Organization launched a global initiative to eliminate industrial trans fats altogether. Margarine had been demonised a second time — and this time, in its old hydrogenated form, the charge was largely fair. The spread invented to be harmless had, through the process used to make it solid, become genuinely harmful, precisely during the years it was being sold as the safe one.
What the double demonisation was really about
Step back from the tubs and the colour laws and the hydrogen catalysts, and the story of margarine is a near-perfect specimen of how food fears actually work — and how badly the search for a single villain can misfire.
The first demonisation teaches one lesson: that a great deal of what looks like concern for the consumer is really commercial warfare wearing a lab coat. The dairy lobby did not fear for anyone’s health; it feared for its market share, and it weaponised the machinery of regulation and the language of purity to kneecap a cheaper rival. The same engine, of an industry shaping what the public believes about a food in order to protect its own sales, drove the way the sugar industry steered blame onto fat and manufactured doubt for decades. When you find a food being loudly condemned, it is always worth asking who profits from the condemnation.
The second demonisation teaches the harder lesson, and it is the one worth carrying to the supermarket. Nutrition science kept doing what it does across all these stories: it identified a single dietary villain — saturated fat — and pushed a simple swap so hard that it created a worse problem. The rush away from butter herded a generation toward trans fats, which turned out to be more dangerous than the thing they fled. And even the original case against butter has since softened; the saturated-fat consensus that seemed unshakeable in 1980 is now genuinely contested, as researchers reappraise how large its effect really is and concede, as they did with the egg, that the arrow drawn from plate to artery was never as straight as it looked. The confident health advice of one decade became the health scare of the next, and the humble spread absorbed both.
The housewife kneading dye into her margarine in 1965, and following her doctor’s advice to buy it in 1980, and reading in 1995 that it might be worse than the butter she gave up — she did nothing wrong at any stage. She was obedient to the best information available, twice, and the information changed under her feet, twice. That is the quiet moral beneath the whole absurd saga. Margarine was never a poison and never a cure; it was a cheap fat that got caught between a protectionist lobby and an over-eager science, condemned first for what it threatened and then for what we did to it in the factory. The spread itself was mostly innocent. What kept demonising it was our recurring hunger for a clean answer to the messy question of what, exactly, we should be afraid to eat.
