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Tyramine in food: the MAOI diet, and the myths still attached to it

Tyramine is a pressor amine: it displaces noradrenaline from nerve endings and raises blood pressure. Normally the enzyme monoamine oxidase destroys it in the gut wall and liver before it gets anywhere. Block that enzyme with a drug and the same plate of food becomes a genuine cardiovascular event — which is why the tyramine diet exists at all.

This page is general information and not a diagnosis or a prescription. If you take a monoamine oxidase inhibitor, the diet sheet that applies to you is the one from your prescriber or pharmacist for your specific drug and dose — the restrictions differ sharply between irreversible non-selective MAOIs, reversible inhibitors and low-dose transdermal selegiline. Never stop, change or reduce a prescribed medicine because of a web page. A sudden severe headache with a spike in blood pressure while on an MAOI needs emergency care.

The “cheese reaction”, and why it was called that

When the first monoamine oxidase inhibitors were introduced as antidepressants in the late 1950s, a pattern of sudden severe headaches and hypertensive episodes appeared in patients taking them. A hospital pharmacist noticed his wife’s attacks followed cheese, and the mechanism was worked out from there: matured cheese is rich in tyramine, monoamine oxidase is what normally destroys dietary tyramine, and the drug had removed that defence.

The result was decades of very long avoid-lists, many of them copied from one another and expanded on suspicion rather than measurement. Modern lists are far shorter, because the foods have actually been analysed. The principle that survived is simple and biochemical: tyramine accumulates where protein has been broken down by microbes or by time. Fresh food is not a tyramine problem; aged, cured, fermented and spoiled food is.

What is genuinely restricted, and what was dropped

The foods that stayed on the list are matured cheeses, air-dried and fermented sausages and other cured meats, fermented soy products including soy sauce and miso, sauerkraut and similar fermented vegetables, yeast extract spreads and brewer’s yeast, and draught or home-brewed beer, which unlike pasteurised bottled beer is still biologically active. Broad bean pods are on the list for a different reason: they contain dopa rather than tyramine, and dopa also matters on an MAOI.

Anything that has been stored too long or is beginning to spoil belongs on the list regardless of what it is — a fish or a piece of meat that has sat too long is the same problem as an aged cheese.

What was dropped is almost as important. Chocolate, bananas, avocado, yoghurt, fresh cheeses such as cottage cheese and mozzarella, and pasteurised bottled beer in ordinary amounts do not carry enough tyramine to matter for most people, and they appear on old sheets because they were guessed at rather than analysed. Banana peel is a real source; banana flesh is not.

Migraine and tyramine: a much weaker story

Tyramine has been proposed as a dietary migraine trigger since the 1960s, and it appears on almost every migraine trigger list in circulation. The evidence behind it is far weaker than the MAOI interaction: provocation studies have been inconsistent, and the foods most often blamed — chocolate, cheese, red wine — are also foods people crave during the prodromal phase, hours before the headache starts, which makes the trigger and the early symptom very hard to tell apart.

Headache guidelines therefore do not recommend blanket dietary elimination for migraine. The recommended approach is to identify an individual’s own reproducible triggers with a headache diary, and to prioritise the factors with much better evidence: sleep regularity, meal regularity, hydration, and caffeine and medication-overuse patterns.

Tyraminepor grupo de alimentos

Faixas, não decimais. Onde uma quantidade publicada para um alimento concreto não pôde ser verificada contra um documento, esta superfície imprime a faixa em vez de um número — e cada alimento abaixo liga à sua própria página de nutrição para ver o que mais há nele.

O que muda o número

• Ageing is the whole variable: the same cheese at three months and at eighteen months is not the same food here.
• Spoilage produces tyramine in anything protein-rich, which is why “eat it fresh” is the core of the diet sheet.
• Pasteurisation and filtration matter for beer — bottled and pasteurised is different from draught and unfiltered.
• The restriction depends on the drug: reversible and selective inhibitors, and low-dose transdermal selegiline, carry much lighter or no dietary restriction. Only your prescriber can say which applies.
• Freezing does not remove tyramine that has already formed, but it does stop more from forming.

Onde mais estes alimentos são assinalados

Alimentos elevados nesta página que também se sentam numa faixa elevada em pelo menos duas das outras quinze. Faixas tranquilizadoras não se contam, então uma linha aqui significa que o alimento realmente acumula rótulos mais do que meramente ser mencionado muito.

Vale a pena ler antes de remover qualquer coisa. As listas nesta superfície foram cada uma escritas para uma pessoa diferente com um problema diferente, e convergem no mesmo grupo pequeno de alimentos densos em nutrientes. Satisfazê-las todas de uma vez produz uma dieta que ninguém desenhou e ninguém testou.

Falar com alguém que realmente pode testar

Nothing on this surface is personal medical advice. If a food genuinely makes you ill, if you have had a kidney stone or a gout attack, or if you are considering removing a food group from your diet, the person to talk to is your doctor, pharmacist or a registered dietitian — they can test for the things that can be tested for, which a table cannot.

Fontes:Product information and prescriber diet sheets for individual monoamine oxidase inhibitors — the only authority on which restriction applies to which drug. · Analytical surveys of tyramine content in aged cheese, cured meat and fermented foods, which are the basis for the shortened modern lists. · Headache society guidance on dietary triggers in migraine, which favours individual diaries over blanket elimination.· Nomes de alimentos e ligações: a base de alimentos do sítio. Verificado2026-09-06.

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