Could Your Gut Be Warning You About Parkinson’s Before Symptoms Start?

I recently came across some fascinating research suggesting that changes in a person’s gut bacteria might actually be an early warning sign of Parkinson’s disease.

We all have our own unique mix of microbes living in our digestive system — bacteria, fungi, viruses — and together they make up what’s known as the gut microbiome. What’s interesting is that researchers have found people with Parkinson’s disease tend to have a distinctly different gut microbiome. Even more striking, this difference also shows up in otherwise healthy people who carry a genetic risk for the disease.

This study, carried out by researchers at University College London, could be a big step forward. It opens up the possibility of developing tests that might identify someone’s risk of Parkinson’s much earlier than we can today. It also raises the idea that we might one day be able to prevent or delay the disease by targeting the gut itself.

Professor Anthony Schapira, who led the study, highlighted just how important this is. Parkinson’s is not only a major cause of disability worldwide, but it’s also the fastest growing neurodegenerative disease in terms of how many people it affects and how deadly it can be. Right now, there’s an urgent need for treatments that can actually slow down or stop its progression.

What’s becoming clearer in recent years is that Parkinson’s — although it affects the brain — seems to be closely linked to what’s happening in the gut. This research adds to that growing body of evidence, suggesting that the microbes in our gut could act as an early warning signal, potentially years before symptoms even begin.

There’s already been related research from King’s College London showing a connection between bacteria in the mouth and gut and the progression of cognitive decline in Parkinson’s — including the shift from mild memory problems to dementia, which is a particularly distressing aspect of the disease. In the UK alone, Parkinson’s affects around 166,000 people.

In this latest study, published in Nature Medicine, researchers looked at data from three groups: 271 people with Parkinson’s disease, 43 people who carry a specific gene variant called GBA1 (which can increase the risk of developing Parkinson’s by up to 30 times) but don’t yet have symptoms, and 150 healthy individuals.

What they found was quite significant. Over a quarter of the microbes in the gut microbiome were different when comparing people with Parkinson’s to healthy participants. These differences were even more noticeable in those at more advanced stages of the disease.

But it didn’t stop there — differences were also found when comparing healthy individuals to those carrying the GBA1 gene variant, even though those individuals hadn’t developed any symptoms yet.

For the first time, researchers were able to identify specific gut bacteria that appear both in people with Parkinson’s and in those who are genetically at risk, before the disease has even started to show itself.

This opens up two really important possibilities: first, that these bacteria could help identify people at higher risk, and second, that changing the gut microbiome — through diet or medication — might actually reduce that risk.

The study also looked at participants’ diets. There was some indication that people who ate a more balanced and varied diet were less likely to have gut microbiome patterns linked to a higher risk of Parkinson’s.

That said, there’s still a lot we don’t fully understand. More research is needed to figure out how genetics, lifestyle, and environmental factors all interact to determine whether someone eventually develops Parkinson’s disease.