Toxic False Morels Linked to ALS Cluster in Alpine Village

A rare cluster of ALS cases in Montchavin, France has been linked to repeated consumption of wild false morels containing gyromitrin, a toxin that converts to monomethylhydrazine and may disrupt nerve signaling over long-term exposure. The mushrooms were re-identified as Gyromitra esculenta group, raising questions about genetic susceptibility and whether traditional cooking can fully mitigate risk, underscoring caution for foragers and the need for further study.