Your unique belly button might actually provide important insights into your health, potentially offering clues about conditions like Parkinson’s, which can be challenging to diagnose.
No single test can definitively diagnose Parkinson’s, leaving doctors to rely on various symptoms, medical histories, and imaging tests such as MRIs to exclude other illnesses. As a result, it can sometimes take years to receive a proper diagnosis.
Interestingly, there are people, like a woman named Joy Milne from Scotland, who have gained attention for their ability to detect Parkinson’s based on smell, long before any visible symptoms arise.
Milne first identified the scent on her husband roughly a decade prior to his diagnosis. She even participated in research at The University of Edinburgh, demonstrating remarkable accuracy in distinguishing those with the disease.
Recent studies are beginning to reveal that Parkinson’s might leave a distinctive chemical signature in body odor, paving the way for earlier and more accessible diagnoses — no need to send samples to Scotland anymore.
What the research showed
Your body continuously produces oils, sweat, and dead skin cells. Various factors, including diet and medications, influence what your body secretes, which can also be found in breath, urine, and saliva.
Most of these substances typically get cleaned away with regular hygiene practices. However, researchers focused on areas that tend to hold onto smells despite cleaning: the belly button, inside the nose, and the concave area outside the ear canal.
These locations often accumulate odors since they are less exposed to soaps, perfumes, and other cleaning agents, making them rich sources of human body odors.
Researchers from Germany examined volatile organic compounds, or VOCs—chemicals that evaporate at room temperature. While many VOCs emit strong odors, some are undetectable by scent.
They collected samples from 24 individuals — six with Parkinson’s, six with mild cognitive impairment, six with COVID-19, and six healthy participants.
To analyze the VOCs, researchers exposed the swabs to highly purified air, causing the VOCs to be released for laser analysis. This process created a sort of “fingerprint” of VOC mixtures from each sample, allowing for comparisons across groups.
The research revealed distinct patterns among the groups, and further testing with additional Parkinson’s patients showed consistent results.
Why it matters
This was a small study, encompassing only two dozen participants, so we can’t definitively assert that this will replace traditional Parkinson’s diagnosis methods, or those for COVID-19 or cognitive issues.
However, it serves as a proof of concept, indicating that non-invasive sampling paired with laser spectroscopy could lay the groundwork for future screening tools.
Scientists emphasize that additional studies are necessary to include larger groups, particularly to understand whether the identified patterns stem from Parkinson’s, aging, or both. This research will also need to consider real-life factors such as the variations in soaps, perfumes, and hygiene practices that could impact test outcomes.
