Scientists discover ancient yeast in Iceman's gut and create sourdough bread

Scientists have discovered yeast in the gut of Oetzi the Iceman, a frozen mummy who lived over 5,300 years ago, and used it to create sourdough bread. The research, published on July 4, 2026, reveals insights into ancient human life and microbial activity.

Ancient Yeast Found in Oetzi's Gut

Oetzi was discovered in 1991 by hikers in the Alps, near the border of Austria and Italy. Researchers at the Eurac Research Institute in Bolzano, Italy, found four types of yeast that can survive extreme cold in his gut and skin. Lead study author Mohamed Sarhan stated, "What we didn't expect to find was yeast." This yeast likely entered Oetzi's body soon after his death, as genetic analysis indicated DNA damage levels similar to the original microbes.

Making Sourdough from Ancient Yeast

After isolating the yeast, scientists attempted to use it for baking. Initially, their efforts failed, but after three months, they successfully created a "very, very good sourdough," according to Sarhan. The yeast, which thrives in cold environments like Antarctica, is thought to have accompanied Oetzi through the millennia.

Implications for Microbial Research

The study also highlighted a rare gut bacterium found in Oetzi, which is nearly absent in modern populations. This bacterium has been linked to traditional diets in certain tribes in Africa and South America. Sarhan noted, "The Iceman is not a biologically 'frozen' time-capsule but rather a complex ecosystem." The potential applications of this ancient yeast include breaking down contaminants like phenol, which was used in Oetzi's preservation.

• Yeast Types: Four different yeasts discovered.
• Research Publication: Microbiome journal.
• Time of Death: Over 5,300 years ago.
• Initial Baking Attempts: Sourdough creation took three months.