This episode, we’re talking ergotism, a fungus-driven poisoning linked to contaminated grains like rye. It’s a vivid One Health case study where weather patterns, crop disease, and human biology collide in ways that were historically interpreted as supernatural, but that we now know are due to the razor thin edge between medicine and poison in the alkaloids nature can produce.

We walk through how ergot infects rye, how it survives across seasons, and why insects help spread it. Then we get into the real driver of the chaos: ergot alkaloids. These compounds can vary by region and growing conditions, creating different “cocktails” that change how outbreaks look from place to place. That variability helps explain why some communities saw gangrenous ergotism with dry gangrene from severe blood vessel constriction, while others faced convulsive ergotism marked by neurological symptoms and hallucinations.

Ergot’s legacy isn’t only tragedy. We also talk about how people experimented with ergot medicinally, including historical midwife use around labor and delivery, and how modern medicine still uses ergot-inspired synthetic compounds in tightly controlled doses. Along the way, we chat about serotonin biology, migraine treatments, medication safety, and why “natural” doesn’t automatically mean safe. We even close with a brief discussion of the most famous semi-synthetic ergot alkaloid of all: LSD, and what its origin story says about the thin boundary between toxin and therapy.

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