This book investigates the historical, biological, and sociological evolution of the human relationship with yeast. Nicholas P. Money, a mycologist, utilizes his scientific background to trace the transition of yeast from a mysterious agent of fermentation to a classified fungus. He argues that the symbiotic connection between humans and this microorganism has fundamentally shaped global culinary traditions and industrial development.

Experts and readers alike note the accessible prose that bridges the gap between academic mycology and general interest history. The text is frequently cited as a clear, informative overview for those interested in the intersection of biology and human culture.