Your Gut Knows Your Age Better Than Your Birthday Does
“It’s just your age.”
How many times have you heard that? The stiff joints, the tiredness that doesn’t lift, the slow creep of blood pressure or blood sugar, the sense that your body is quietly running hotter than it used to. We’re taught to accept it as the price of another birthday—the body simply wearing down on schedule.
But a major study published in September 2026 asks a question I’ve been sitting with in the treatment room for twenty years: what if age isn’t the main thing associated with how inflamed and unwell we become? What if an important part of the story is happening in the gut?
1,199 adults
Researchers studied adults aged 20 to 72 using stool samples, blood samples and health measures.
30 inflammatory markers
The team compared systemic inflammation with chronological age and gut-microbiome composition.
Future health tracked
The researchers also examined incident disease risk during approximately eight years of follow-up.
What the gut microbiome and inflammation study found
In September 2026, a team of Danish scientists led by researchers including Susanne Brix of the Technical University of Denmark and Karsten Kristiansen of the University of Copenhagen published a study in Nature Communications.
They took stool and blood samples from 1,199 adults aged 20 to 72, measured 30 inflammatory markers in the blood alongside 19 other health measures, and asked a simple question: which tells us more about a person’s inflammatory profile—how old they are, or the composition of their gut microbiome?
The answer was striking. Chronological age was associated with around 40 percent of the inflammatory markers. In the study’s analyses, gut-microbiome composition explained more variation than age for 97 percent of those markers and 84 percent of the other physiological measures examined.
In plain language: the gut ecosystem tracked the state of the body more closely than the number of birthdays a person had celebrated.
The findings went further. People with one particular gut-community pattern showed raised inflammation and poorer metabolic health already in early adulthood. In the researchers’ modelled trajectories, this pattern of “inflammaging”—the chronic, low-grade inflammation commonly associated with ageing—appeared up to 37 years earlier. This group also had a higher risk of developing disease across several body systems during the follow-up period.
The opposite pattern was also seen. People with a rich, diverse gut community, including bacteria known for producing short-chain fatty acids, tended to have lower inflammation and lower future disease risk.
The researchers describe gut-microbiota composition as “a potentially modifiable determinant of inflammation-related disease trajectories across adulthood.”
That word—modifiable—is the one I want you to hold onto.
What this means through the lens of bioharmony
At Bottoms Up Colonics, everything we do rests on one principle I call bioharmony: approaching the body as an intelligent, self-regulating system rather than something to force into compliance. A body isn’t a machine that runs down on a fixed timetable. It’s a living, responsive ecosystem, and the conditions we give it can influence how it functions and how we experience our health.
The body is a living ecosystem
This study doesn’t use my language, of course. But it lands in a related place. Mainstream science has often treated age-related inflammation as something that simply happens to us. Here, researchers report that the gut’s inner terrain tracked with inflammation more closely than chronological age—and that microbiome composition may be modifiable.
That’s the heart of what I teach through the Matrix of Health: the gut sits within a web connecting digestion, immunity, mood, energy and the way we move through the years. Supporting the conditions around that system may give the whole person more room to find balance.
It also echoes a much older story. More than a century ago, Nobel laureate Élie Metchnikoff explored the relationship between intestinal microbes, fermented foods and longevity. John Harvey Kellogg later drew on emerging ideas about the intestinal environment in his own approach to bowel health. What this 2026 study adds is population-scale evidence showing that microbiome patterns are closely associated with inflammation and later disease risk.
Being honest about what the study shows
- This was an observational study, so it identifies associations rather than proving cause and effect.
- It cannot tell us whether microbiome differences drive inflammation, whether inflammation changes the microbiome, or whether other factors influence both.
- Diet, medication, movement, sleep, stress, environment and other lifestyle factors may contribute to both microbiome composition and health.
- The modelled “37 years earlier” finding describes a group-level trajectory, not an individual biological-age test.
- The research did not investigate colon hydrotherapy or Rojas Colon Hydrotherapy®.
Precision is what earns trust. This research does not prove that bacteria alone cause inflammation, and the authors call for further work to test the relationships they identified. What it does support is a broader premise: the gut is not a passive tube, and the condition of its microbial ecosystem is meaningfully associated with whole-body health.
Where Rojas Colon Hydrotherapy® fits
Rojas Colon Hydrotherapy® isn’t a shortcut around diet, rest, movement or the slow work of looking after yourself. It is one practitioner-led, complementary option within a much bigger picture, with a focus on bowel function, comfortable elimination, hydration awareness, client education and helping people reconnect with their body’s patterns.
Hydration is central to the way we work at Bottoms Up Colonics. During a Rojas session, filtered, temperature-controlled water is introduced gradually through a closed system while a trained therapist remains with the client throughout. Treatment is individually screened and adapted according to the client’s history, comfort and response.
An important scientific boundary
This study did not test colon hydrotherapy. It cannot show that Rojas Colon Hydrotherapy® reduces inflammation, changes biological age, restores microbiome diversity or prevents disease. We share the research because it adds to the wider understanding of the gut as part of an interconnected biological system—not because it proves a treatment outcome for our service.
Your birthday is fixed. Your inner ecosystem is dynamic. And that, to me, is one of the most hopeful messages emerging from this research.
With grace and gratitude,
Suzy
Explore the science and the Rojas approach
Continue reading our evidence hub, find your nearest clinic or explore professional training with Bottoms Up Colonics.
Frequently asked questions
What is inflammaging?
Inflammaging is a research term for the persistent, low-grade inflammation often associated with ageing. It is influenced by many biological, environmental and lifestyle factors and is not diagnosed from the gut microbiome alone.
Can the gut microbiome reveal a person’s biological age?
This study found that gut-microbiome composition explained more variation in many inflammatory and physiological measures than chronological age did. That does not mean a stool sample can provide a definitive biological-age score for an individual.
Does gut bacteria cause systemic inflammation?
The study found strong associations, but its observational design cannot establish cause and effect. The relationship may run in both directions and may also be influenced by diet, medication, lifestyle and other health factors.
Was Rojas Colon Hydrotherapy® included in this study?
No. The research did not investigate colon hydrotherapy. It cannot establish that Rojas Colon Hydrotherapy® changes inflammation, microbiome diversity, biological age or disease risk.
Why is this study relevant to Bottoms Up Colonics?
It contributes to the wider scientific understanding that the gut exists within an interconnected biological system. That aligns with our whole-person philosophy, while remaining separate from evidence about colon-hydrotherapy outcomes.
Source
- Eriksen C, et al. Gut microbiota composition outperforms chronological age in predicting systemic inflammation and incident disease risk. Nature Communications. Published online 8 September 2026. doi:10.1038/s41467-026-77499-9.
