Ancient yeast from Oetzi revives Alpine bread tradition

Scientists working with the frozen remains of Oetzi the Iceman, discovered on the Austria-Italy border in 1991, have isolated yeast that lived in the mummy's gut for more than 5,300 years and used it to produce a working sourdough starter, according to CBS News. The microbe, preserved in the body's tissues since the Copper Age, represents the oldest known sample of its kind and offers a rare glimpse into the microbial ecology of prehistoric Alpine populations.

The discovery carries particular resonance for Valle d'Aosta, where the Walser communities and other Alpine groups have maintained continuous bread-making traditions across centuries. The yeast's survival and viability suggest that fermentation practices may have deep roots in the region's food culture, predating written records by millennia.

The research underscores how the Alps function as a natural archive of human history. The extreme cold that preserved Oetzi also preserves the microbial record of his diet and digestive system, offering archaeologists and food historians a tangible link to prehistoric subsistence practices that conventional excavation cannot reach.