What happens when you take cacao with MAOIs?
Cacao is the seed of Theobroma cacao, the same plant that gives us chocolate. Most commercial chocolate is fermented, dried, roasted, and conched, steps that reduce the biogenic amines present in the raw bean. Raw cacao — sold as raw nibs, raw cacao paste, or ceremonial cacao drinks — skips much of that processing, so it can carry a somewhat higher amine load. Monoamine oxidase inhibitors (MAOIs) block the enzymes that normally break those amines down. Here is the sequence of events that the theoretical concern is built on:
- Raw cacao carries biogenic amines. Analytical studies of cocoa beans find tyramine as the most abundant amine, with smaller amounts of tryptamine and 2-phenylethylamine. Fermentation and roasting lower these levels, so raw or minimally processed cacao tends to carry more than a finished chocolate bar.
- MAOIs disable the enzymes that clear amines. Irreversible non-selective MAOIs such as phenelzine, tranylcypromine, and isocarboxazid switch off the MAO-A and MAO-B enzymes that would normally break tyramine down in the gut and liver.
- Tyramine can act as a pressor. If a large enough amount of tyramine reaches the bloodstream intact, it displaces stored norepinephrine and can raise blood pressure — the so-called "cheese reaction."
- Cacao's actual tyramine content is low. This is the key correction: MAOI-diet analyses place cocoa and chocolate among the low-tyramine foods, well below the threshold linked to a pressor response. No human case of a hypertensive crisis triggered by cacao on an MAOI has been reported.
So while the direction is real — raw beans hold more amines than processed chocolate — the magnitude is modest. Cacao is not in the same risk tier as aged cheese, cured meats, or fermented soy products.
Why is this important?
Ceremonial cacao has become popular in wellness circles, often consumed as a large hot drink. That is a bigger serving of unprocessed cacao than a person eating a square of chocolate would encounter, which is why it is worth a moment of thought rather than a moment of panic.
It matters mainly because the older advisories are imprecise. The leaflet printed with many MAOI prescriptions says only "chocolate in moderation," phrasing that predates the ceremonial cacao trend. Patients may not realize that raw cacao paste and ceremonial drinks are a more concentrated form of the same food. The honest framing is: be moderate, not fearful.
Risk also depends on the type of MAOI. Irreversible non-selective MAOIs are the ones the diet is written for. Moclobemide, a reversible MAO-A inhibitor, is much more forgiving because tyramine can compete it off the enzyme. Low-dose transdermal selegiline preferentially targets brain MAO-B and largely bypasses the gut, so dietary restrictions are generally not required at the lowest patch strength; higher patch strengths do carry restrictions.
What should you do?
The practical approach is moderation and a conversation with your prescriber, framed around when changes happen rather than fixed amounts.
Before changing anything: Ask your prescriber or pharmacist to translate your MAOI diet into plain terms for raw and ceremonial cacao. Confirm which MAOI you are on, since the rules differ sharply between irreversible agents and moclobemide or low-dose selegiline patches.
Every day, while on therapy: Treat large servings of raw or ceremonial cacao with caution rather than treating them as a free food. Keep raw cacao and processed chocolate to modest amounts. Spacing a small chocolate treat away from other amine-rich foods in the same sitting is reasonable, though cacao on its own is low-tyramine.
After any change or if symptoms appear: If you develop a severe, pounding headache with palpitations, neck stiffness, profuse sweating, or chest pain after eating, seek emergency care and mention that you take an MAOI. Do not reach for over-the-counter decongestants, which can worsen a pressor reaction. Report any concerning episode to your prescriber so your diet and medication can be reviewed.
Which specific products are affected?
If any caution applies, it applies most to the least-processed, largest-serving cacao products:
- Ceremonial cacao drinks made from raw cacao paste
- Raw cacao paste and raw cacao bars from raw-food brands
- Raw cacao nibs and raw cacao powder in smoothies, granola, and trail mix
- Unfermented or minimally fermented cacao products
Processed dark chocolate is lower still, because fermentation, roasting, and conching reduce the amine content. Cocoa butter, used in white chocolate and as a cooking fat, contains negligible amines.
The MAOIs the diet is written for are phenelzine, tranylcypromine, and isocarboxazid, plus higher-strength selegiline patches. Moclobemide and the lowest-strength selegiline patch are much more forgiving. The antibiotic linezolid has weak MAOI activity and carries a lower but non-zero theoretical concern.
The science behind it
The dietary picture comes mainly from a 2022 prescriber's review of the MAOI diet, which re-examined the actual tyramine analyses behind the classic food restrictions. It places cocoa and chocolate in the low-tyramine category — measured levels well below the amounts linked to a pressor response — and notes that the historic "avoid chocolate" advice overstates the real risk for most patients (Van den Eynde et al., Psychopharmacology Bulletin, 2022; PMC9172554).
A 2025 narrative review of cocoa biogenic amines confirms the food-chemistry direction: tyramine is the dominant amine in cocoa beans, and processing steps such as fermentation and roasting shift and generally reduce the amine profile (Paparella et al., 2025; PMC11764846). Together these sources support a modest, moderation-based caution rather than blanket avoidance. There is no published human case of a cacao-induced hypertensive crisis on an MAOI, which is why the severity here is moderate rather than high.
Frequently Asked Questions
Do I have to give up chocolate completely on an MAOI?
No. Current MAOI-diet analyses classify cocoa and chocolate as low-tyramine foods. Modest amounts of processed chocolate are generally fine; the caution is mainly about large servings of raw or ceremonial cacao. Confirm with your prescriber.
Is ceremonial cacao more of a concern than a chocolate bar?
Slightly, because it is less processed and usually consumed in a larger serving, so it carries proportionally more amines. It is still considered a relatively low-tyramine food, so moderation rather than strict avoidance is the usual advice.
Could cacao cause serotonin syndrome with my MAOI?
This is largely theoretical. Raw cacao contains only trace serotonin and tryptamine. Serotonin syndrome risk is driven far more by combining serotonergic medications than by food, so discuss your full medication list with your prescriber.
Does it matter which MAOI I take?
Yes, a lot. Irreversible MAOIs are the ones the diet is written for. Moclobemide and the lowest-strength selegiline patch are much more forgiving and often need little or no dietary restriction.
What symptoms would signal a problem?
A sudden, severe pounding headache with palpitations, neck stiffness, heavy sweating, or chest pain after eating warrants emergency care. Mention that you take an MAOI and avoid over-the-counter decongestants.
How should I time cacao around my medication?
There is no need to time cacao around the dose itself, because MAOIs act on enzymes for the long term, not hour by hour. The practical principle is moderation in serving size rather than spacing it from the pill.
Key takeaways
- Raw and ceremonial cacao carry more biogenic amines than processed chocolate, but dietary analyses still classify cocoa and chocolate as low-tyramine foods.
- There is no documented human case of a hypertensive crisis from cacao on an MAOI, so the realistic stance is moderation, not blanket avoidance.
- Be most cautious with large servings of raw or ceremonial cacao if you take an irreversible MAOI; moclobemide and low-dose selegiline patches are more forgiving.
- Seek emergency care for a sudden severe headache, palpitations, or chest pain after eating, and avoid over-the-counter decongestants.
- Review your specific MAOI diet and any cacao products with your doctor or pharmacist rather than relying on the older "chocolate in moderation" leaflet alone.