Can odors from our bodies signal Alzheimer's, cancer and other diseases?

Key Points:

• Nurses at a Norwegian cancer ward frequently use their sense of smell to detect infections and other medical conditions, highlighting the long-recognized link between body odors and disease dating back to Hippocrates.
• Advances in technology and machine learning are enabling the development of noninvasive diagnostic tests that analyze volatile organic compounds (VOCs) from breath, urine, and sebum to detect diseases such as cancer, Parkinson’s, and infections.
• Several breath-based tests already exist, including one for Helicobacter pylori, and new AI-driven urine tests for bladder cancer and Alzheimer's are nearing commercial launch with FDA Breakthrough Device designations.
• Research into sebum VOCs has identified distinct chemical signatures associated with Parkinson's disease, potentially allowing earlier diagnosis before symptoms appear, based on studies involving patients and individuals with related sleep disorders.
• Challenges remain in standardizing VOC testing and understanding biomarker origins, but ongoing research shows promise for applications in infection diagnosis, antibiotic stewardship, and critical care monitoring, offering hope for more accessible and rapid disease detection.