Ancient Yeast Bakes 5,300-Year-Old Sourdough, June 05

Researchers from Eurac Research in Bolzano extracted living yeast from the remains of Ötzi the Iceman, a 5,300-year-old mummy discovered frozen in the Austrian Alps. After three months of laboratory work, the team successfully baked sourdough bread using the ancient microorganism. The findings, published in the journal Microbiome, reveal that cold-adapted fungi can remain active inside preserved human remains for thousands of years.

How Scientists Revived Ancient Microbes

Researchers found four different yeast species living in Ötzi’s intestines, on his skin, and in water from his partially melted body. These cold-adapted fungi normally survive only in extreme environments like Antarctica and the Alps. Lead researcher Mohamed Sarhan told AFP the team did not expect to find yeast at all. Genetic analysis showed the microorganisms entered the mummy shortly after death and remained preserved for millennia.

From Lab to Loaf

Scientists began cultivating the ancient yeast in laboratory conditions. Initial attempts to bake bread failed, but after three months of experimentation, the team produced what Sarhan described as a “very, very good” sourdough starter. The first successful loaf marked a breakthrough in using prehistoric microorganisms. Co-author Frank Maixner noted the yeasts “accompanied Ötzi on his long journey through the millennia.”

What’s Next for Ötzi’s Microbes

Researchers are now considering brewing beer from the ancient yeast. When Sarhan told colleagues about the yeast discovery, he said people immediately asked if bread could be made. The team plans to apply the same techniques to fermentation. Ötzi, believed murdered by an arrow around 3,300 BC, was discovered by hikers in 1991 in a glacier on the Italy-Austria border.

Why This Matters for Science

The discovery proves microorganisms can persist and remain active inside preserved human remains despite decades of freezing. This opens new research into prehistoric life and ancient microbiology. Ötzi’s remarkably preserved body has already provided scientists with an unprecedented window into Bronze Age life, revealing he was in his 40s, about 160 centimeters tall, and ate red deer and wheat.

Final Thoughts

Scientists successfully baked sourdough using 5,300-year-old yeast from Ötzi the Iceman, proving ancient microbes can survive millennia in extreme cold. The breakthrough opens new possibilities for studying prehistoric life through microbiology.

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