Scientists have produced sourdough bread using yeast strains recovered from the gut of Ötzi the Iceman, a mummy dating back roughly 5,000 years [1].
The experiment demonstrates the resilience of ancient microbes and provides a rare glimpse into the biological makeup of prehistoric humans. By reviving these strains, researchers can study how microbial life evolved over millennia and whether ancient organisms offer unique properties for modern food production.
The research team extracted the yeast from the remains of the Iceman, who was discovered in the Ötztal Alps on the border of Italy and Austria [2]. The team said they sought to explore ancient microbial life and assess how these strains might be applied to contemporary baking and brewing [1].
Reports on the age of the recovered biological material vary slightly. Some records describe the yeast as 5,000 years old [1], while other reports characterize the sourdough starter as 5,300 years old [3]. This range reflects the complexities of dating organic material from the Copper Age.
To create the bread, the scientists cultivated the ancient yeast to develop a functional starter. This process allowed the team to test the viability of the microbes after thousands of years of preservation in the alpine ice. The resulting sourdough loaf serves as a tangible link to the dietary, and biological, environment of the prehistoric era [2].
The project is part of a broader effort to understand the symbiotic relationship between early humans and their gut microbiomes. By isolating specific strains, scientists can compare ancient yeast to modern commercial varieties to identify lost genetic diversity, a key factor in the flavor and fermentation of traditional breads.
“Scientists have produced sourdough bread using yeast strains recovered from the gut of Ötzi the Iceman”
The successful revival of these microbes suggests that biological material can remain viable or recoverable even after five millennia of extreme cold. For the scientific community, this opens doors to 'resurrecting' extinct or dormant microbial strains, which could lead to the discovery of new enzymes or fermentation properties that have been lost to time in modern industrial agriculture.
