Leaky Gut – What Does It Actually Mean? (Science Proof No. 1)
Written by: Sven Altorfer
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Time to read 4 min
The intestine is not an impermeable wall, but a dynamically regulated boundary – so-called tight junctions control precisely what reaches the body.
Leaky gut describes increased intestinal permeability – and often causes no noticeable symptoms, even though biological changes are already taking place at the cellular level.
A long-term study with 1,420 symptom-free participants showed: increased intestinal permeability was associated with a later Crohn's diagnosis – sometimes detectable up to three years in advance.
The study does not prove causality, but it makes clear: biological processes do not begin only when we feel something.
Our intestine should be permeable. Just not to everything.
What happens when our intestinal barrier becomes more permeable – and why can such changes exist long before we notice them?
A boundary does not need to be impermeable to protect.
An intelligent boundary
Our intestine is not a closed wall. That would actually be problematic: after all, it must be able to absorb water, minerals, and nutrients from our food.
At the same time, the intestinal wall forms an important boundary between the intestinal contents and the interior of our body. It must regulate very precisely what is allowed to happen – and what is not.
You can therefore compare it more to a living natural boundary: permeable, dynamic, and highly regulated.
What does leaky gut mean?
Leaky gut is a popular term. Scientifically, one speaks more precisely of increased intestinal permeability – that is, increased permeability of the intestinal barrier.
The intestinal mucosa consists of a single layer of tightly connected cells. Between these cells are complex connection structures, including so-called tight junctions.
They help regulate which substances can pass between the cells. These connections are not rigid. They are continuously regulated and respond to their biological environment.
Can you feel increased intestinal permeability?
Not necessarily.
Increased intestinal permeability (leaky gut) is not in itself a clearly perceptible symptom. Therefore, you cannot determine based solely on bloating, fatigue, or other nonspecific complaints whether the intestinal barrier has changed.
And conversely, the absence of complaints does not necessarily mean that nothing has changed biologically. This is precisely where a remarkable long-term study becomes interesting.
The study
Increased Intestinal Permeability Is Associated With Later Development of Crohn's Disease
Turpin W. et al. · Gastroenterology · 2020
1,420 symptom-free participants
7.8 years median follow-up
50 later Crohn's diagnoses
What was examined?
The researchers examined 1,420 people aged 6 to 35 years who had no symptoms of Crohn's disease at the start. All were first-degree relatives of people with Crohn's disease and thus belonged to a group with increased familial risk.
The permeability of the intestinal barrier was measured using a so-called lactulose-mannitol test. The participants were then observed over several years.
What was observed?
Notably increased intestinal permeability (leaky gut) at the start of the study was associated with a later Crohn's diagnosis. This association was even still detectable when the measurement had taken place more than three years before the later diagnosis.
Biological changes can occur long before we consciously perceive them.
Why is this interesting?
At the time of the first measurement, the people examined were symptom-free.
The study thus shows that a changed intestinal barrier can be present before a disease becomes clinically visible. This is an important indication that biological processes do not always begin only when we feel something.
What does this mean biologically?
Our intestinal barrier lies at an extraordinary interface. On one side are food, microorganisms, and countless components of the intestinal contents. On the other side are our tissue and a highly active Immune System.
If the regulation of this boundary changes, the contact between components of the intestinal contents and the Immune System can also change. This is why the intestinal barrier is an important field of research today – particularly in chronic inflammatory bowel diseases.
SCIENTIFIC CLASSIFICATION
What this study does not prove
The study does not prove that increased intestinal permeability (leaky gut) causes Crohn's disease.
It also does not show that every person with increased intestinal permeability will later become ill.
Furthermore, a randomly selected general population was not examined, but close relatives of people with Crohn's disease. This limitation is important when interpreting the results.
What can we take away from this?
Our intestinal barrier is not a passive protective wall. It is a dynamic biological system that continuously regulates what is exchanged between the intestine and the body.
We normally do not feel this work.
And that is precisely what makes the results of this study so interesting: Having no complaints does not automatically mean that nothing is happening at the biological level.
Source / Original study
Turpin W. et al. Increased Intestinal Permeability Is Associated With Later Development of Crohn's Disease. Gastroenterology. 2020;159(6):2092–2100.e5
Current research. No exaggeration. No promises of a cure. Just sound Science.
Sven Altorfer
Sven Altorfer is Head of Research and Development at Swiss Health Nutrition AG. With his expertise in nutrition and bioactive substances, he advocates for natural health approaches to promote preventive measures and the body's self-healing powers.
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