Care should be taken with foods (e.g tyramine/protein containing foods) and drugs (e.g SSRI s) that have a contraindication for MAOI's.
The beta-carbolines present in Banisteriopsis caapi, primarily harmine and tetrahydroharmine, inhibit the enzyme Monoamine Oxidase and reduces the metabolism of serotonin. Due to the MAO-inhibiting action of the vine, otherwise non-orally-active tryptamines such as N-N DMT and 5-MEO DMT from the admixture plants (Psychotria viridis or Diplopterys cabrerana) can reach receptor sites in the brain, unlocking the entheogenic mareacion.
This MAOI action also makes certain foods and pharmaceuticals hazardous that otherwise would not be.
Lists of foods that should be avoided can be found here.
There are no records of fatalities from eating proscribed foods, but there are numerous reports of severe headaches.
Interaction with pharmaceuticals can be much more dangerous than food interactions. Even some OTC pharmaceuticals like antihistamines, decongrestants, ephedrine and pseudoephedrine, diet pills, and allergy medication can have potentially serious interaction with Ayahuasca. If you are taking pharmaceuticals, please inform yourself about the potential for MAOI interaction before taking Ayahuasca. See this link for more information. If you don't find an existing thread about your medication on the Information forum, you are encouraged to start one.
Lastly, there is a very rare and idiosyncratic reaction to caffeine and Ayahuasca in a very few individuals. Until you know you are not in this category, be careful combining Ayahuasca with caffeine. A discussion of this may be found here and here.
The Ceremonies during the Conference are optional and you pay the Shaman or their representative directly. The Conference does not take responsibility for the Ceremonies.