Ancient yeast from Ötzi yields sourdough thousands of years old

Scientists have isolated yeast from the gut of Ötzi the Iceman, the 5,300-year-old mummy discovered on the Austria-Italy border, and used it to make sourdough bread, according to reporting by Agence France-Presse cited by Phys.org. The yeast has survived in the frozen remains since Ötzi was killed by an arrow in the high Alps, more than a thousand years before the Egyptian pyramids were built. The discovery offers a rare window into ancient Alpine microbial life and the fermentation practices of prehistoric mountain communities.

The research team cultivated the dormant microbes from Ötzi's remains and successfully used them in bread-making, demonstrating that the yeast remained viable despite millennia of preservation in ice. The finding adds to the body of evidence about how Alpine populations adapted to high-altitude life and food storage in the pre-Bronze Age. Ötzi, discovered in 1991 on the Similaun glacier near the Ötztal in South Tyrol, has long been a focal point for understanding how early mountain dwellers survived harsh winters and managed nutrition in isolated terrain.

The discovery carries particular resonance for the Trentino-Alto Adige region, where Ötzi remains a cultural and scientific landmark. The mummy's location on the border between South Tyrol and Austria underscores the shared Alpine heritage that defines the region's identity and its position between Italian and German-speaking cultures. The research, conducted by international teams, exemplifies how the region's archaeological treasures continue to yield insights into prehistoric European settlement and adaptation.

The successful cultivation of ancient yeast also speaks to contemporary Alpine food traditions. Sourdough fermentation has deep roots in mountain communities across the Alps, where isolation and cold storage made naturally fermented breads essential to survival. The experiment connects modern understanding of microbiology to the empirical knowledge that sustained Alpine populations for thousands of years, turning a scientific finding into a tangible link between past and present foodways in the high mountains.