Why is a tapioca poisonous?

Tapioca itself is not poisonous; it is derived from cassava, a root vegetable that contains naturally occurring cyanogenic glycosides. These compounds can release cyanide when the cassava is improperly processed or consumed raw. Proper preparation, which includes peeling, soaking, and cooking the cassava, effectively removes these toxins, making tapioca safe to eat. Always ensure that tapioca is sourced from reputable producers and prepared correctly.