Scientists may be closer to developing a fast, non-invasive way to assess gut microbiome health — simply by analyzing a person’s breath. New research suggests that volatile organic compounds (VOCs) released by gut bacteria can be detected in exhaled air and reflect changes in the microbiome linked to disease.
In a study published in Cell Metabolism, researchers analyzed breath and stool samples from healthy children and children with asthma. They found that specific breath compounds closely mirrored metabolites produced by gut bacteria and could even predict the presence of bacterial species previously linked to asthma. Similar results were observed in animal models, strengthening the evidence that breath analysis can act as a reliable proxy for gut microbial activity.
Researchers say the findings could pave the way for rapid screening tools that bypass time-consuming stool analysis, especially in hospitals and pediatric settings. While more work is needed before breath-based diagnostics are used clinically, scientists believe this approach could eventually support earlier detection and intervention for conditions tied to gut microbiome disruption — all from a simple breath sample.
SOURCE:
The Scientist, January 22, 2026