Memory Matters Weekly #30
A recent study from the University of Aberdeen suggests that early signs of diseases like Parkinson’s disease and Lewy body dementia might appear in the gut years before symptoms begin. It sounds like a potential breakthrough or is just an early signal?
The researchers analysed old gut biopsy samples from 196 people in their 60s. At the time, these samples had been labelled as normal. Years later, the team re-examined them, this time looking for misfolded proteins linked to neurodegenerative diseases, including tau, alpha-synuclein, and TDP-43.
Around 60% of participants had at least one of these misfolded proteins present in their gut tissue, despite their original results being considered normal. Over a follow-up period of around 13 to 15 years, approximately 37% went on to develop neurological symptoms.
The strongest associations were not with Alzheimer’s disease, but with conditions linked to alpha-synuclein, including Parkinson’s and Lewy body dementia.
What does this actually show?
This study shows a link between early protein changes in the gut and later neurological disease. It does not prove that these changes cause the disease, or that they begin in the gut.
It is just as possible that the gut is reflecting changes already happening elsewhere in the body. In other words, it may be an early signal, not the starting point.
How accurate is this kind of early signal?
This is where the findings need careful handling.
The test showed relatively high sensitivity, meaning it correctly identified many people who later developed disease, in some cases over 80% depending on the condition. However, specificity was low, often below 50%.
In simple terms:
- A positive result does not mean someone will definitely develop a condition
- A negative result does not guarantee they will not
This makes it unsuitable as a reliable screening tool in its current form.
There are several reasons why this research is not ready for clinical use.
The study looked backwards at existing samples rather than following people forward in real time. That makes it useful for identifying patterns, but not for establishing cause and effect.
The group studied was also quite specific. All participants were over 60 and had already experienced gut symptoms significant enough to require investigation. This limits how widely the findings can be applied.
The sample size, at 196 people, is relatively small for a condition as complex as dementia. Larger and more diverse studies are needed to confirm the results.
What this means for caregivers
There is no test available based on this research, and nothing here changes current diagnosis or care. But more and more research is also now focused on detecting neurodegenerative diseases earlier, possibly years before symptoms appear.
If these early signals can eventually be made more accurate and reliable, they could become part of future screening or risk assessment. But that is still a long way off.
For now, this study is best understood as an early piece of evidence rather than a practical tool.
Read it here: Gut biopsies could predict dementia, Parkinson’s and MND years before symptoms develop
In Other News
Want to reduce your risk of dementia? Pick up an instrument or take a foreign trip!
A separate study from Trinity College Dublin has linked activities like learning music, travelling, and staying socially engaged with better cognitive performance in mid-life.
This is not a new idea, but the study looked at multiple risk and protective factors together rather than in isolation.
The key finding is that people who regularly engage in a mix of mental, social, and physical activities tend to perform better on thinking and memory tests.
However, the same limitation applies as in much lifestyle research. It is difficult to separate cause and effect. People with better cognitive health are more likely to stay active, while those experiencing difficulties may naturally withdraw.
For caregivers, the practical takeaway is not about adding pressure or adopting unrealistic habits. The evidence continues to point toward the value of regular engagement, even in small, everyday ways.
Read it here: Want to reduce your risk of dementia? Pick up an instrument or take a foreign trip
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Read more here → About Khadra Awomer’s dementia caregiver journey