# Co je Leaky Gut Syndrom (Syndrom propustného střeva)? ## Základní vysvětlení **Leaky gut** (dosl
Just ten years ago, most doctors would have dismissed any mention of a "leaky gut" with a wave of their hand. Today, the situation is changing dramatically. Leaky gut syndrome, referred to in English-language literature as leaky gut syndrome, has become one of the most discussed topics in modern medicine and gut microbiome research. A growing number of gastroenterologists, immunologists, and general practitioners are recognising that gut health can have far-reaching consequences for the entire body – from chronic fatigue and autoimmune diseases to mental health issues.
But what exactly is leaky gut, and why should we care?
The gut is not just a tube that processes food. It is a complex ecosystem lined with billions of bacteria and protected by a thin but enormously important layer of cells – the intestinal mucosa. This mucosa acts as a selective filter: it allows nutrients, vitamins, and minerals to pass into the bloodstream, while simultaneously preventing the penetration of harmful substances, toxins, and undigested food particles. When this barrier stops functioning properly, we refer to it as leaky gut syndrome. The gaps between the cells of the intestinal wall widen, and substances that do not normally belong there begin to enter the bloodstream.
Try our natural products
How leaky gut affects the whole body
The immune system, which guards the bloodstream, responds to these "intruders" with an alarm. An inflammatory response is triggered – initially local, but with repeated exposure, gradually systemic. It is precisely this chronic low-grade inflammation that is now associated with a wide range of lifestyle diseases. A research team from Harvard Medical School has published several studies in recent years suggesting that increased intestinal permeability may play a role in the development of Crohn's disease, coeliac disease, rheumatoid arthritis, as well as type 2 diabetes and depression.
Let us take a concrete example from everyday life. Jana, a thirty-eight-year-old teacher from Brno, had suffered for several years from unexplained joint pain, chronic fatigue, and recurring skin rashes. She underwent dozens of examinations, and the results were always "within normal range". It was only a gastroenterologist specialising in functional gastrointestinal disorders who recommended a comprehensive examination of her gut microbiome and inflammatory markers. The results showed significantly elevated levels of zonulin – a protein that regulates the tightness of intercellular junctions in the intestinal wall, and whose elevated levels are considered one of the indicators of leaky gut. After changing her diet and taking targeted care of her microbiome, her condition improved significantly over the course of several months.
Stories like Jana's are not exceptional. The problem is that leaky gut does not have one typical symptom that would immediately point doctors in the right direction. The manifestations are varied and often resemble other conditions: bloating, diarrhoea or constipation, food intolerances, skin problems such as eczema or acne, frequent infections, brain fog, fatigue, or mood swings. This is precisely why diagnosis is often delayed, and patients travel from specialist to specialist without receiving a satisfactory answer.
The medical community is meanwhile aware that this is a topic that can no longer be ignored. As gastroenterologist Alessio Fasano, one of the world's leading experts on intestinal permeability, wrote: "The gut is the gateway to health. If this gateway does not function properly, the entire system is at risk." Fasano is also the author of groundbreaking research on the role of zonulin and its connection to autoimmune diseases, which has fundamentally changed the scientific community's perspective on this topic.
What damages the gut barrier and what protects it
The causes of leaky gut syndrome are multifactorial, meaning that a whole range of factors contribute to its development simultaneously. Modern lifestyle seems to have been designed to systematically weaken the gut barrier. Industrially processed foods full of emulsifiers, preservatives, and refined sugar disrupt the balance of the gut microbiome. Chronic stress increases cortisol levels, which has a direct negative effect on the integrity of the intestinal mucosa. Excessive use of antibiotics decimates the beneficial bacteria that protect the intestinal wall. Alcohol, non-steroidal anti-inflammatory drugs such as ibuprofen or naproxen, and lack of sleep – all of these are factors that research repeatedly associates with increased intestinal permeability.
On the other hand, there are ways to support and strengthen the gut barrier. Science has advanced to the point where we can now speak of specific, evidence-based strategies:
- Fermented foods such as kefir, kimchi, sauerkraut, or kombucha enrich the gut with beneficial bacteria and support a healthy microbiome balance.
- Fibre from various sources – vegetables, legumes, whole grains – feeds beneficial bacteria and supports the production of short-chain fatty acids, which nourish the cells of the intestinal wall.
- L-glutamine, an amino acid naturally present in the body, is a key fuel for intestinal mucosal cells, and its supplementation may contribute to the restoration of a damaged barrier.
- Stress reduction through meditation, exercise, or adequate sleep has a demonstrable positive effect on gut health.
- Elimination of triggers – in sensitive individuals, temporarily removing gluten, dairy products, or other potential dietary triggers can bring significant relief.
It is also important to mention the role of probiotics and prebiotics. While probiotics introduce live beneficial microorganisms into the gut, prebiotics provide them with food so they can establish themselves and multiply. The combination of both approaches, referred to as a synbiotic strategy, is currently considered in the scientific literature to be one of the most promising ways to support the restoration of the gut barrier. A review study published in the journal Frontiers in Immunology confirmed that targeted modulation of the microbiome can statistically significantly reduce markers of intestinal permeability.
But why are more and more doctors talking about leaky gut right now? The answer lies partly in scientific progress and partly in the health reality of the modern population. Gut microbiome research has undergone a true revolution in the past decade thanks to DNA sequencing technologies, which make it possible to map the composition of gut bacteria in a specific individual in detail. Projects such as the Human Microbiome Project, funded by the US National Institutes of Health, have brought fascinating data on the enormous influence the microbiome has on human health. Scientists today speak of the gut microbiome as a "second brain" or even as a separate organ.
The gut-brain axis is one of the most interesting and fastest-developing areas of research. The gut and brain are connected via the vagus nerve and communicate through neurotransmitters – and remarkably, up to 90% of serotonin, the happiness hormone, is produced in the gut. Disruption of the gut environment can therefore have a direct impact on mood, anxiety, or cognitive function. These findings help explain why patients with leaky gut syndrome so often also suffer from psychological difficulties, and why psychiatrists and neurologists are paying increasing attention to gut health.
Critics and sceptics point out that the term "leaky gut syndrome" is not recognised as a standalone diagnosis in traditional medicine – and there is some truth to this. Increased intestinal permeability as a physiological phenomenon is scientifically documented, but its direct causal relationship with specific diseases is still the subject of research in some cases. This is precisely why it is important to approach the topic with openness, but also critically – and to seek out doctors who are able to combine a traditional medical approach with the latest findings from functional medicine.
For everyday practice, this means one thing: caring for gut health should not be the domain only of those who already have health problems. Prevention is always easier than treatment. High-quality, minimally processed food rich in fibre and fermented foods, regular exercise, adequate sleep, and conscious stress management – these are the pillars on which a healthy gut rests. And a healthy gut, as it turns out, is the foundation of a healthy body and mind.
The more scientists discover about the gut microbiome and intestinal permeability, the more clearly it emerges that the old saying "we are what we eat" holds a deeper truth than anyone suspected. The gut is not merely a digestive organ – it is the centre of immunity, emotional health, and overall vitality. And that is precisely why it deserves far more attention than we give it.
