A highly acclaimed new study by the Leibniz Institute on Aging (FLI) and the Friedrich Schiller University Jena could fundamentally change modern research on the intestinal barrier, the immune system and healthy ageing. The scientists have come to the conclusion that the microbiome becomes unbalanced in old age – as previously assumed – not primarily because the bacteria in the intestinal flora itself changes, but because the immune surveillance in the intestinal barrier increasingly fails. This is precisely why there is now a greater focus on strategies that are intended to stabilize not only the microbiome, but above all the intestinal environment and the gut-associated immune system – including the medically researched PMA zeolite, which is attracting increasing attention as part of modern prevention and longevity concepts.<\/p>\n
It is now well known that trillions of microorganisms live in the human gut. Together they form the so-called microbiome – a highly complex biological ecosystem that influences metabolism, detoxification, vitamin production, hormone balance and even brain functions, but above all the functions of our immune system. However, this system only functions so stably because it is constantly monitored.<\/p>\n
The Jena researchers therefore describe the microbiome as a kind of \u201cecosystem on a leash\u201d. The immune system constantly monitors which microorganisms are multiplying too much, which are spreading aggressively and which could endanger the balance. As long as this monitoring works, the microbiome remains stable – often for decades. With increasing age, however, this control begins to weaken. Science refers to this as \u201cimmunosenescence\u201d – the ageing of the immune system.<\/p>\n
And this is where it gets really exciting. Because the researchers show: When this immunological control weakens, individual microorganisms can suddenly gain the upper hand, namely those that are generally not beneficial to our health. In addition, microbial diversity increases, pro-inflammatory germs spread and the chronic subliminal inflammation that is now known as \u201cinflammaging\u201d develops – in other words, the silent constant fire of the ageing body.<\/p>\n
Many people still think of the immune system in abstract terms – the immune cells are floating around somewhere in the blood, or perhaps they are located in the tonsils or lymph nodes. In reality, however, the majority of our immune system is located directly in the gut. Around 70 to 80 percent – some scientists even speak of up to 90 percent) of all immune cells are located in the so-called gut-associated immune system (GALT), i.e. directly in and under the intestinal mucosa, which in turn is part of the intestinal barrier.<\/p>\n
This is where it is decided second by second what is friend and what is foe, where a distinction is made between food, harmless microorganisms, environmental substances, pathogens and potential dangers. It is where billions of intestinal bacteria constantly communicate with immune cells, mucosal cells and signaling substances. And this is ultimately where the balance is created that determines whether the body remains stable – or slowly drifts towards chronic inflammation. The intestinal barrier is therefore much more than just an \u201cintestinal wall\u201d. It is a control center, border guard, communication platform and biological early warning system all in one. Or to put it more simply: it is the safety center of the human body.<\/p>\n
In the modern longevity scene, i.e. the possible medical measures to grow old in a healthy way, a lot is already being talked about: NAD+, spermidine, cold baths, biohacking, stem cells, fasting protocols or infusion therapies and, of course, pro- and prebiotics for a healthy gut flora. But many of these strategies overlook a fundamental problem. After all, what good is the best microbiome if the intestinal barrier is unstable? What use are probiotics if immune surveillance no longer functions properly? And above all: what use are high-tech longevity concepts if silent inflammation has long since developed in the intestine and is a permanent burden on the body?<\/p>\n
This is what makes the results of the new Jena study so important. It shifts the focus away from pure \u201cbacterial manipulation\u201d to the question of how the immunological stability of the gut can be maintained in the long term. As we have already reported on this several times, the intestinal barrier itself is also becoming the focus of attention (see also: Intestinal health and the microbiome: nothing works without a healthy intestinal barrier<\/a> and Chronic and silent inflammation: How environmental exposures and our lifestyles promote cancer, diabetes, cardiovascular and autoimmune diseases<\/a>).<\/p>\n Accordingly, more and more scientists, doctors and preventive physicians are now focusing on substances that can stabilize the intestinal environment, i.e. the intestinal barrier. The active ingredient PMA zeolite is becoming increasingly interesting because it does not directly supply bacteria like a classic probiotic, but influences the intestinal environment itself. More and more studies are showing, among other things, that PMA zeolite can stabilize the intestinal barrier, thus reducing inflammatory processes and binding and eliminating harmful substances and metabolic breakdown products such as ammonium without burdening the human metabolism. This special mechanism of action is becoming increasingly important, especially in the context of chronic environmental pollution – and not only in old age for the indirect stabilization of the immune system, but also at a young age, because environmental pollution now affects us all.<\/p>\n The intestinal immune system does not work in a vacuum. It is constantly reacting to what affects the intestinal wall on a daily basis: highly processed food, environmental toxins, heavy metals such as cadmium, lead or mercury, pesticides, microplastics, PFAS, the so-called eternal chemicals, alcohol, medication, stress and the associated chronic inflammation that affects more and more people as a result, regardless of whether they are young or old. You could also say that the intestinal barrier is now a high-performance filter under constant attack and it needs to be better protected and play a greater role in prevention and longevity concepts than before.<\/p>\n The new work from Jena may in turn mark a small paradigm shift that will be followed by many more in terms of intestinal research, according to the scientists: it is not the microbiome alone that primarily determines health and ageing as well as the state of the immune system. Rather, it is the body’s ability to regulate this microbiome in a stable manner and this regulation is located directly where the intestinal barrier, mucosal immunity and microbiome meet.<\/p>\n If you want to age healthily, you may therefore first need to protect the biological boundary where the immune system and the environment come into direct contact every day. With the volcanic mineral PMA zeolite, this is also possible, which is why its importance in prevention and longevity strategies continues to grow.<\/p>\n Source:<\/span><\/p>\n Liu S, Costa FS, Valenzano DR: \u201cImmune surveillance and microbial escape in the aging host: Why does the microbiome lose its balance?\u201d, PLOS Biology, 2026<\/strong><\/p>\n In their new study, researchers from the Leibniz Institute on Aging (FLI) and the University of Jena conclude that the age-related destabilization of the microbiome is apparently not primarily caused by changes in the intestinal bacteria themselves, but by a decline in immune surveillance in the intestinal barrier. The ageing immune system increasingly loses the ability to control dominant and pro-inflammatory microorganisms, which can tip the microbial balance and lead to chronic inflammation (\u201cinflammaging\u201d). The work is considered an important new approach to understanding healthy ageing and could significantly influence the development of future prevention and longevity strategies.<\/p>\nPMA zeolite: Why stabilizing the intestinal barrier is suddenly even more important<\/h2>\n
Timely prevention therefore begins not only with the bacteria, but with control over them<\/h3>\n