The Sulfite Panic: Why Your Wine Headache Isn't What You Think

Somewhere in a restaurant tonight, someone will pour a second glass of red, feel the familiar thickening behind the eyes an hour later, and say the thing that half the wine-drinking world now says by reflex: it’s the sulfites. They will say it with confidence, because they have read the words on the back of the bottle — contains sulfites — a phrase printed there by law, in plain warning-style capitals, on every bottle of wine sold in the United States and, in its own form, across Europe. The headache is real. The words on the label are real. The connection between them, drawn so naturally that it feels like common knowledge, is almost certainly false — and the story of how that false connection got printed onto every wine bottle in the country begins somewhere unexpected — at an American salad bar in the 1980s, with people who could not breathe.

The thing sulfites really do

Concede the real danger first, because there is one, and it is the seed the whole myth grew around. Sulfites — sulfur dioxide and the related salts, sulphur being the older spelling — are genuine preservatives, and they are genuinely added to wine, as they have been in one form or another for centuries, because they stop oxidation and kill the stray yeasts and bacteria that would otherwise turn a good wine to vinegar. They also occur naturally as a by-product of fermentation, so that even a wine with nothing added contains some. They are used far beyond wine: on dried fruit, in some processed potatoes, in various packaged foods, wherever a producer wants to hold off browning and spoilage.

And for a small, specific group of people, sulfites are dangerous. The group is mainly asthmatics — a genuine sulfite sensitivity affects an estimated small percentage of the general asthmatic population, with the reaction being respiratory: wheezing, chest tightness, bronchospasm, in the worst cases a severe and even fatal asthma attack. This is real, documented, and was the reason regulators got involved at all. Note the shape of the true reaction, because it is the hinge of the entire story: sulfite sensitivity, where it exists, attacks the lungs. It is an asthmatic reaction. It is not, in the medical literature, a headache. Hold that distinction; the myth depends entirely on blurring it.

The salad bar and the label

In the late 1970s and early 1980s, American restaurants discovered that sulfites were a wonderful way to keep a salad bar looking fresh. Sprayed or dipped, sulfite solutions kept cut lettuce green, apple slices pale, and shrimp bright, hour after hour under the heat lamps. The trouble was the dose. A helping of salad treated this way could carry a startling quantity of sulfite, far more than a glass of wine, and asthmatics eating it had no warning at all. Through the early 1980s a series of severe reactions was reported, and some of them were fatal — a number of deaths were linked to sulfites on restaurant food. People sat down to a salad and stopped breathing.

The response was regulatory and, for once, swift. In 1986 the U.S. Food and Drug Administration banned the use of sulfites on fresh fruit and vegetables intended to be eaten raw — the salad-bar practice was outlawed outright. Then, to protect the sensitive from the sulfites that remained legitimately in other foods, the FDA moved to require labelling: from 1987 and 1988, any food or beverage containing more than ten parts per million of sulfites had to say so. Wine, which naturally sits above that threshold, was caught squarely by the rule. And so, from the late 1980s, every American wine bottle began to wear the words that would launch a thousand dinner-table diagnoses: CONTAINS SULFITES.

It is worth pausing on the scale of the mismatch the label quietly created, because it explains everything that followed. The population the warning was written to protect is small and specific: the fraction of asthmatics whose airways react to sulfur dioxide, perhaps a few per cent of asthmatics and a vanishing slice of everyone else. The population that would go on to read the warning and apply it to themselves is enormous — essentially every wine drinker who has ever suffered after a glass and turned the bottle over looking for an answer. A message calibrated for a rare respiratory allergy was printed, by the blunt logic of a labelling threshold, onto a product consumed by tens of millions of people who had never wheezed at a salad bar in their lives. The warning did not go looking for those people. They came to it, symptom in hand, and found a word waiting.

That label was a public-health triumph aimed at a genuine, narrow, respiratory danger to asthmatics. It did exactly what it was designed to do. It also did something nobody designed: it printed, on the back of every bottle of wine in the country, a single chemical name in warning capitals, right next to a drink that a great many people already suspected of giving them headaches. The state had, with the best of intentions, handed the folk imagination a defendant, complete with a name badge.

The fork: the label becomes the culprit

Watch the exact moment the record and the myth separate, because it is almost visible. The label says contains sulfites. It is a warning — it looks like a warning, capitals and all — and human beings reason about warnings in a very particular way: if it is on the bottle in that font, it must be the thing to watch out for. A person who reliably gets a headache from red wine reads those words, and the mind performs its favourite operation, closing the gap between two facts that happen to sit near each other. I get a headache from wine. The wine warns about sulfites. Therefore the sulfites give me the headache. It feels less like a guess than like reading the answer off the label. The reasoning is the same shape that turns a mandatory disclosure into a perceived danger elsewhere — the same instinct that reads a printed ingredient as a printed threat, which we met in the panic over palm oil in Nutella, and the same conflation of a rule with a verdict that colours the argument over why much of Europe declines to fluoridate its water.

The trouble is that the evidence dismantles the sulfite explanation almost as fast as you can state it, and it does so with a set of facts anyone can check. First: the reaction sulfites actually cause is asthmatic and respiratory — sulfite-sensitive people wheeze and struggle for breath, and headache simply does not appear as the characteristic response in the clinical literature. Second, and most damning, is a simple comparison of quantities. White wine generally contains more sulfites than red wine, because winemakers use more to protect the paler, more oxidation-prone whites, and sweet whites more still. Dried apricots contain vastly more sulfite than any wine — often ten times as much or more. If sulfites were the headache agent, white wine should punish you harder than red, and a handful of dried apricots should be agony. For the overwhelming majority of “sulfite” sufferers, neither is true: it is the red wine that brings the headache, and the apricots and the white pass without incident. A cause that is present in larger amounts in the foods that don’t trigger you, and smaller amounts in the one that does, is not your cause.

There is a final tell. Europe, and increasingly organic and “natural” producers everywhere, sell wines labelled low in added sulfites or made without them, and the market for such wines has grown precisely on the promise of a headache-free glass. People who buy them, believing the sulfites were the problem, frequently report the same old headache from the same old red. The variable they removed was not the variable that mattered.

So what is actually giving you the headache

Take sulfites away and the honest answer is that red-wine headache is a real, poorly understood phenomenon with several better suspects, and no single villain has been convicted. Alcohol itself is a dehydrating vasodilator and a reliable headache agent at volume, and it is the least glamorous and most likely contributor. Histamine, produced during fermentation and higher in reds because of the extended contact with grape skins, can trigger headache and flushing in people who break it down poorly. Tyramine and other biogenic amines are on the list. Tannins, far more abundant in red than white, are a popular suspect, though the evidence is mixed. And in 2023 a group at the University of California, Davis, put forward an elegant hypothesis centred on quercetin, a flavanol that red grapes produce when their skins are exposed to sunlight: they proposed that a quercetin metabolite can inhibit an enzyme in the body’s alcohol-processing chain — aldehyde dehydrogenase, ALDH — causing a build-up of the toxic intermediate acetaldehyde, the same compound behind the Asian flushing response and a plausible source of a fast headache. It remains a hypothesis under active investigation, still awaiting the studies that would confirm or bury it. That candour is the point: the real science of the red-wine headache is still an open question, argued over by researchers, with sulfites barely in the conversation. The folk answer is confident. The real answer is honest, and honesty here means admitting we are still not sure.

What it is really about

Underneath the whole affair is one of the most human things there is: the need to give a real discomfort a name. The headache is not imagined. The person feeling it is right about the most important fact — the red wine did this to them — and merely wrong about the mechanism. What they want is not a scientific paper; it is a defendant they can point to and, ideally, avoid. The label handed them one. Printed in capitals on the back of every bottle was a single unfamiliar, slightly chemical-sounding word, positioned exactly where the mind goes looking for a culprit, and the mind did what minds do. “It’s the sulfites” is not stupidity. It is the entirely reasonable behaviour of a person trying to make a real problem legible, working with the only clue the bottle offered.

And that is why the myth is so sturdy and so hard to dislodge. It has a real symptom behind it, a real chemical, a real warning label with the force of law, and a real regulatory tragedy at its root — the asthmatics who died at the salad bar, whose deaths are the reason the words are there at all. Every element is true except the one connection everyone draws between them. The sulfite panic is a small, almost gentle example of a pattern that runs under far graver beliefs on this desk: take a scattering of genuine facts, let the mind close the gaps between them into a story, and the story will feel not like a theory but like something you simply read off the world. Next time the headache comes, it is worth remembering that the words on the label were put there to save an asthmatic’s life, and were never meant to explain your evening at all.