The ayahuasca dieta is a set of food, drink, medication and behavior restrictions you follow for at least 2 weeks before ceremony. Most of the food rules exist because the ayahuasca vine inhibits monoamine oxidase, the enzyme that clears tyramine from what you eat. The medication rules exist for a different reason, and they matter more.
Almost every dieta page in this field ranks the risk backwards. The food list gets treated as the dangerous part and the medication list gets treated as fine print. Across 9 years and roughly 1,900 guests at our center on the Río Momón, nobody has been harmed here by something they ate. One guest was harmed by an antidepressant she never properly stopped. Cheese has never been our problem. An SSRI was.
What is the ayahuasca dieta?
It’s a preparation protocol, and it has 2 halves that get blurred together.
One half is pharmacological. No alcohol, no fermented or aged foods, no serotonergic medication, no recreational drugs. Those rules trace to a specific enzyme interaction and they’re the reason your retreat asks about your prescriptions.
The other half is traditional. Minimal salt and sugar, no pork or red meat, no scented products, sexual abstinence in the final stretch. Those come from Amazonian vegetalismo, where a clean, plain, quiet body is understood to make you easier for the plants to work on.
Both halves are worth keeping. Only one of them will show up in a hospital.
One enzyme explains most of the food list
Ayahuasca is 2 plants doing 2 jobs. Chacruna leaf supplies DMT, which your gut would normally destroy before it reached your blood. The Banisteriopsis caapi vine supplies beta-carbolines that inhibit monoamine oxidase, the enzyme that would have done the destroying. Block the enzyme and the DMT survives the trip through your stomach. That’s the entire trick, and it’s the reason ayahuasca reaches the brain at all.
The enzyme has a day job. Monoamine oxidase also clears tyramine, an amino acid your body makes and your food delivers. Tyramine pushes noradrenaline out of nerve endings, which raises blood pressure. Inhibit the enzyme, and in theory tyramine stacks up faster than you can clear it.
FDA labeling notes that intestinal MAO is predominantly type A, which is the subtype the vine hits hardest. So the gut is where this argument happens.
That mechanism is real. It’s also where every dieta page in this field stops thinking.
Why the cheese warning is weaker than this field admits
The hypertensive crisis people are afraid of comes from a different class of drug, and the difference is not cosmetic.
Phenelzine and tranylcypromine are irreversible MAO inhibitors. They destroy the enzyme. Your body has to build new enzyme over about 2 weeks, and until it does, tyramine has nowhere to go. That is the cheese effect, and it has killed people.
The vine’s beta-carbolines don’t work that way. Harmine, harmaline and tetrahydroharmine are, in the words of a 2025 review in CNS Spectrums by Rafael dos Santos and Jaime Hallak, “potent selective, reversible, and competitive inhibitors” of MAO-A. Reversible and competitive means tyramine can compete for the same site and push the inhibitor off it. The Frontiers in Pharmacology group led by Ilana Berlowitz put the consequence plainly in 2022: complete inhibition is close to unattainable with reversible competitive inhibitors like beta-carbolines.
Then there’s the question of what has happened to people. In 2024, Eleanor White and colleagues published a systematic review of ayahuasca adverse events in the International Journal of Toxicology, pulling from preclinical, clinical, epidemiological and pharmacovigilance data across 78 articles. On tyramine, the review describes a potential risk and reports no documented cases of it happening. On serotonin syndrome, it describes “extremely rare case studies” and states that no confirmed cases were found. One epidemiological study inside it followed 614 people, 31 of whom were taking psychiatric medication, and found no sign of increased adverse effects from drug interactions.
Read that carefully, because it’s easy to over-read. It does not say the mechanism is fake. It says the size of the risk has never been measured. Unknown and small are not the same word, and neither of them is zero.
None of this is permission to eat the cheese. Keep reading for why we still say no.
How much tyramine is actually in the food you were told to skip
Less than you’d guess, and the amount depends more on how long it sat in your fridge than on what it is.
Kenneth Shulman and Scott Walker measured tyramine in real supermarket food and published the results in the Journal of Clinical Psychiatry in 1999, in a paper called Refining the MAOI Diet. Their working ceiling was 6 mg of tyramine per serving. Below that, safe. Here’s what they found, rounded to 2 decimals.
| Food, as tested | Tyramine per serving | Against the 6 mg ceiling |
|---|---|---|
| Chain pizza, every variety tested | 0.00 to 0.38 mg | Under 1/15th |
| Aged Romano | 0.12 mg | About 1/50th |
| Feta with sundried tomatoes | 0.17 mg | About 1/35th |
| Tofu, fresh | 0.23 mg | About 1/26th |
| Mozzarella | 0.51 mg | About 1/12th |
| Soy sauce, 5 brands | 0.15 to 3.37 mg | Up to just over half |
| Tofu, 7 days in the fridge | 4.79 mg | 21x the fresh figure |
| Supermarket medium cheddar | 6.54 mg | Just over |
| The same cheddar, 8 days opened | 10.79 mg | Nearly 2x |
Aged Romano, the exact thing every dieta list tells you to fear, measured lower than mozzarella. Fresh tofu was harmless and the same tofu a week later was 21 times worse. The food category is a poor predictor. Storage time is a good one.
Now the other half of the arithmetic. The FDA’s selegiline patch label reports tyramine challenge studies, where volunteers swallow escalating tyramine doses until systolic blood pressure rises 30 mmHg. That dose has a name, TYR30, and it’s how anyone serious measures this.
| Degree of MAO-A inhibition | Tyramine needed to raise systolic BP 30 mmHg | FDA requires a diet |
|---|---|---|
| Selegiline patch, 6 mg/24h, fasted | 338 mg | No |
| Selegiline patch, 6 mg/24h, after 33 days | 292 mg and 204 mg | No |
| Selegiline patch, 12 mg/24h | 95 mg, 72 mg and 88 mg | Yes |
| Same 12 mg group, most sensitive individual | 25 mg | Yes |
Put the 2 tables together. The most sensitive person in the FDA’s higher-dose group needed 25 mg of tyramine to move his blood pressure 30 points. The worst food Shulman and Walker measured, cheddar left open 8 days, carried 10.79 mg. He’d have needed 2 and a bit servings of it.
And nobody has run that test on ayahuasca. There is no TYR30 for a cup of brew. That gap, not a known danger, is the honest state of this question.
Two caveats I won’t skip. Shulman and Walker tested specific products in Canada in the late 1990s, so treat their numbers as the shape of the risk, not a lookup table for your fridge. And selegiline is a different drug from the vine, so the second table shows you how thresholds are measured, not what ayahuasca’s threshold is.
What we still restrict in 2026, and why we keep the food rules anyway
We keep the full list, because unknown risk is cheap to avoid and skipping a wheel of brie costs you nothing.
Our required preparation starts a minimum of 2 weeks before you arrive. The prep guide goes out 4 weeks ahead, and about 55% of guests take the optional 30-minute call with Lucia before they fly.
Pharmacological, and not negotiable
- Alcohol. Beer and wine especially, since fermentation and the load on your liver stack.
- Fermented and aged foods. Aged cheese, soy sauce, miso, kombucha, sauerkraut, kimchi, cured and smoked meat, overripe fruit.
- Serotonergic medication. SSRIs, SNRIs, lithium, tramadol, triptans, stimulants and pharmaceutical MAOIs. Reviewed one by one, and some need a supervised taper.
- Recreational drugs, cannabis included, minimum 2 weeks off.
Traditional, and still worth keeping
- No pork or red meat.
- Minimal salt, sugar and spice, and no processed food.
- Sexual abstinence, including masturbation, for at least 1 week and ideally 2.
- No scented products, which is part custom and part practical in a screened room in the jungle.
Caffeine gets tapered rather than dropped. Stopping cold 3 days out buys you a withdrawal headache on your first ceremony night, which helps nobody. We recommend stepping down and being off it about a week before you fly.
Do you have to stop your antidepressant before ayahuasca?
Yes, and the timeline is set by the drug, not by how you feel.
- SSRIs: minimum 6 weeks off. Fluoxetine needs 8, because it clears so slowly.
- SNRIs: minimum 6 weeks, often longer, because the withdrawal is rougher.
- ADHD medication: 2 weeks.
- Tramadol: 2 weeks.
- St. John’s wort: 2 weeks.
- 5-HTP: 1 week.
- Benzodiazepines: case by case, and physician-supervised, because benzo withdrawal is dangerous on its own.
- Lithium: absolute contraindication. No taper, no exceptions, no retreat.
This is the part of the dieta with a body of evidence behind it. The NIH’s StatPearls reference names SSRIs, SNRIs, tricyclics, certain opioids, triptans and St. John’s wort among the serotonergic drugs contraindicated with MAOIs, because of serotonin syndrome, which it calls potentially life-threatening. Reversible inhibition doesn’t rescue you here the way it might with a sandwich. The serotonin problem is about how much serotonin is in the system, not about who’s holding the enzyme.
Dra. Carmen Ríos Medina, our medical director, reviews every intake form within 72 hours and talks to your own prescriber directly when a taper is involved. We won’t ask you to stop a medication behind your doctor’s back. If your physician thinks the taper is unsafe, you don’t come that cycle.
The mistake we see every few months: someone’s doctor said 2 weeks would be fine. They land in Iquitos with brain zaps and emotional whiplash sitting underneath ordinary pre-ceremony nerves, and the medicine arrives on a nervous system that’s already unstable. It rarely hurts them. It wastes their trip.
The night that wrote our medication rules
In 2018, before Dra. Ríos worked with us, a woman arrived on a low-dose SSRI.
She disclosed it. She’d been honest on the form. I was the one who didn’t understand the interaction, and when she offered to skip a few doses before ceremony I accepted that, because I didn’t know enough to say no.
She drank. What followed wasn’t full serotonin syndrome, but she ran an elevated heart rate for hours with agitation, tremors and heavy sweating. There was no doctor on the property. I sat with her all night taking her pulse with my fingers, because I didn’t own a pulse oximeter. She was fine by morning.
Within 6 weeks I’d recruited Dra. Ríos, bought medical equipment and rebuilt screening from nothing. Every taper number in the section above exists because of that night. So does the fact that we now turn away 13% of applicants outright, with another 5 to 8% conditionally accepted who never meet the conditions, usually because they won’t complete a taper.
That’s the whole reason I get impatient with the cheese conversation. I have watched exactly one person get hurt by a broken dieta here, and it was a prescription. You can read how this place started for the rest of that story.
How do we know if you actually followed the dieta?
We don’t, and we say so. Nobody can follow you around your kitchen for 2 weeks. So we do 3 other things.
David Park, our senior facilitator, asks you directly on arrival day. What did you eat yesterday. When was your last drink. When was your last sexual activity. Face to face, with the reason explained. Most people are honest once they understand the question is about their own safety rather than about being graded.
Then we respond in proportion. A glass of wine 3 days out gets noted and nothing more. Red meat the day before may mean you sit out the first ceremony and drink on night 4 instead. Undisclosed benzodiazepine use gets you sent home before you drink anything, which has happened once.
And Don Enrique has his own read. During the soplada diagnóstica, the mapacho smoke reading he does over every guest before serving, he has paused mid-pour and said through me: “Your body is not clean. You can drink, but the vine will make you pay for it.” That guest purged for 4 hours. She prepared impeccably for the other 3 ceremonies.
3 people have lied to us on an intake form in 9 years. Every one of them lied about a medication or a psychiatric history. Nobody has ever lied to us about cheese.
What happens if you break it?
Depends on what you broke and whether you tell us.
Break a food rule and the likely cost is a rougher night. A poorly prepared body purges harder, cramps more and gets less out of the experience. Vomiting is already the norm rather than the exception here, and the Global Ayahuasca Survey published in PLOS Global Public Health in 2022 found 62.0% of its 8,216 respondents reporting vomiting or nausea. Arrive on 3 days of takeout and you’re volunteering for the harder end of that.
Break a medication rule and the cost is different in kind. That’s the one where the mechanism has a body count in the broader MAOI literature.
In 2023 a guest told us mid-retreat that he’d lied on his form. He’d stopped his SSRI 2 weeks before, not 6. Dra. Ríos reassessed him, we adjusted his dose and watched him more closely, and nothing went wrong. He was lucky, and the follow-up verification process changed because of him.
If you can’t hold the dieta on your assigned dates, email us before you fly and ask about moving them. A disclosed break is a calendar problem, and we would far rather have that conversation than the other one. A hidden break is a medical problem in a place where the hospital is 45 minutes downriver by fast launch and there’s no road in.
What you’ll eat once you’re here
Simple food, cooked plainly, with the salt and oil taken out on ceremony days.
Rosa Vásquez has run our kitchen for 8 years. Fish comes from the Momón and the Nanay, fruit from community gardens and the property, staples from the Belén market in Iquitos. No meat other than fish is served during a retreat.
On non-ceremony days: fruit and oatmeal or rice porridge in the morning. Rice, lentils or beans, steamed vegetables and river fish at midday. Something lighter in the evening, usually with a soup option. Herbal teas throughout, ginger and lemongrass and muña.
On ceremony days it tightens. Fruit and oatmeal for breakfast. The last meal lands at 4 PM and it’s plain rice, boiled plantains and simple vegetables with no salt, oil, spice or seasoning at all. No dinner. You walk into the maloca at 7:15 PM on an empty stomach, which matters for how the medicine lands and for what the night does hour by hour. Crackers, fruit and tea come back around 3 AM when the ceremony closes.
Vegetarian and vegan are easy here. Gluten-free is manageable. Severe allergies get discussed during screening and passed to Rosa before you land.
The dieta and the master plant dieta are 2 different things
One word, 2 practices, and confusing them is why people arrive expecting a month of isolation.
The preparation dieta is what this article is about. 2 weeks minimum, at home, in your own kitchen, before you fly.
A master plant dieta is a supervised isolation period with a single plant. Chiric sanango and bobinsana run 8 days. Ajo sacha runs 8 to 15. Piñon blanco runs 10 to 15. Renaquilla and chullachaqui caspi, the deep ones, run 15 to 30. You stay in an isolated tambo, eat boiled plantains, rice and bland fish, take the plant daily, and hold strict behavioral restrictions: no physical contact, no media, no salt or sugar or spice, no sexual activity, limited conversation. Don Enrique and Wilber supervise directly.
If a page tells you the dieta lasts a month, it’s describing the second thing. If it tells you the dieta is about purity, it’s describing the second thing badly. Our own view on what this work does and doesn’t deliver is in our guide to the benefits of ayahuasca.
The one thing that puts you at risk
Arriving with a broken dieta and hiding it.
Everything above is manageable when we know about it. Dose gets adjusted, monitoring gets tighter, a ceremony gets skipped, dates get moved. None of that works on information we don’t have. Both of the guests this center has evacuated in 9 years went to hospital because of something left off a form.
The ayahuasca dieta, stated the way we’d want a friend to hear it. Follow the food list, because it asks little of you and the evidence behind it is unfinished. Follow the medication list as though the timing decides everything, because that’s the half with documented harm behind it. And tell us the truth on arrival day, even if the truth is that you had a beer at your sister’s wedding.
If you want to see the screening and the schedule before you commit, our 10-day retreat page has both. If you’d rather ask something first, that’s the better move anyway. The ayahuasca dieta gets much easier to hold once you know which line on it is doing the real work.
This article is for education and is not medical advice. Ayahuasca interacts dangerously with a range of prescription and over-the-counter drugs. Never stop or change a prescribed medication without your prescribing physician, and talk to a qualified doctor before attending any ceremony.
FAQs
What is the ayahuasca dieta and how long does it last?
The ayahuasca dieta is a set of food, drink, medication and behavior restrictions followed before ceremony. We require a minimum of 2 weeks, and the preparation guide goes out 4 weeks ahead. It is a different thing from a master plant dieta, which is a supervised isolation period of 8 to 30 days with a single plant, taken at the center rather than at home.
What foods should you avoid before an ayahuasca ceremony?
Alcohol, aged and fermented foods (aged cheese, soy sauce, miso, kombucha, sauerkraut, kimchi, cured and smoked meat, overripe fruit), pork and red meat, processed food, and heavy salt, sugar and spice. The fermented and aged items are on the list because they carry tyramine, and the vine inhibits the enzyme that clears it. Caffeine is tapered rather than stopped abruptly, and we recommend being off it about a week before you fly.
Can you eat cheese before ayahuasca?
We say no, and the reason is weaker than most retreat sites admit. Shulman and Walker measured a supermarket medium cheddar at 6.54 mg of tyramine per serving, rising to 10.79 mg after 8 days opened, against a 6 mg working ceiling. Aged Romano measured 0.12 mg, lower than mozzarella at 0.51 mg. A 2024 systematic review in the International Journal of Toxicology found no documented case of a tyramine hypertensive crisis from ayahuasca. Unknown risk is not zero risk, and skipping cheese for 2 weeks gives up nothing worth having, so the rule stays.
Do you have to stop antidepressants before ayahuasca, and for how long?
Yes, and the timeline depends on the drug. SSRIs need a minimum of 6 weeks off, and fluoxetine needs 8 because it clears slowly. SNRIs need 6 weeks or more. ADHD medication, tramadol and St. John’s wort need 2 weeks. 5-HTP needs 1 week. Benzodiazepines are handled case by case under physician supervision. Lithium is an absolute contraindication with no exceptions. Every taper is supervised jointly by our medical director and your own prescriber.
What happens if you break the ayahuasca dieta?
It depends on what you broke and whether you disclose it. A glass of wine 3 days before arrival gets noted and nothing more. Red meat the day before may mean sitting out the first ceremony. Undisclosed benzodiazepine use gets you sent home before you drink. Tell us before you fly and moving your dates becomes a conversation. A disclosed break is a scheduling problem and a hidden one is a medical problem.
Is the ayahuasca dieta spiritual or medical?
Both, and the halves are worth separating. The pharmacological half (alcohol, fermented and aged foods, serotonergic medication, recreational drugs) traces to a specific enzyme interaction. The traditional half (no pork or red meat, minimal salt and sugar, sexual abstinence, no scented products) comes from Amazonian vegetalismo. We keep both. Only one of them ends up in a hospital record.
Can you drink coffee before an ayahuasca ceremony?
Not on the day, and ideally not in the final week. We ask guests to taper caffeine rather than quit cold, because stopping abruptly 2 or 3 days out delivers a withdrawal headache on the first ceremony night. Step down gradually and aim to be off it roughly a week before you fly.