When a family in Nepal rushed a father‑in‑law to the hospital after eating wild honey, the cause was quickly identified: the honey, known locally as “bhir mauri ko maha,” contains grayanotoxin, a natural toxin produced by rhododendron flowers. The toxin concentrates in the honey made by the Himalayan cliff bee, Apis laboriosa, and can cause a rapid drop in heart rate and blood pressure.
How the toxin works
Grayanotoxin interferes with the electrical signals that drive heart muscle contractions. Consuming as little as a teaspoon can produce a warm, light‑headed feeling, but larger amounts—often just a few tablespoons—can slow the heart to life‑threatening levels. Symptoms typically appear within 30 to 60 minutes and include dizziness, nausea, and weakness. In Nepal, patients are treated with intravenous fluids and the drug atropine, which restores normal rhythm, and most recover within a day or two.
Who is being affected
Reviewing 27 published papers from 2009 onward, researchers identified 68 documented cases of mad‑honey poisoning. About 72 % of those patients were middle‑aged men who deliberately consumed the honey as a traditional remedy for high blood pressure or to enhance sexual function. The therapeutic dose is extremely close to the toxic dose, and the exact amount varies by season, location, and batch.
Poisonings cluster in spring, when rhododendron blooms are at their peak and the main honey harvest occurs. A smaller wave appears in autumn during a secondary harvest. Cases have now been reported outside Nepal, including South Korea (2013), France, Qatar and the United States, where online sellers market the honey as a “psychoactive superfood” at prices of several hundred dollars per kilogram, often without clear consumption warnings.
Online sales create a public‑health risk
Major international e‑commerce platforms now list mad honey, exposing consumers in the United States, Europe and Asia to a product they may not understand. Without proper dosage guidance, users can inadvertently ingest a harmful amount, delaying diagnosis because doctors in many countries are unfamiliar with the condition.
What researchers plan next
The study’s authors intend to sample honey from different Nepalese districts and seasons to measure grayanotoxin levels and identify which rhododendron species produce the most toxin. They also aim to investigate how the cliff bee tolerates the compound, a question that could shed light on broader ecological relationships.
Beyond human health, the cliff bee itself faces threats from overharvesting, habitat loss and climate change. As the bee pollinates high‑altitude Himalayan plants, its decline could disrupt the delicate mountain ecosystem.
Original reporting: KTBS 3 (Shreveport) — read the source article.
