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Gut microbiome and chronic diseases: scientific and clinical analysis
A few decades ago, doctors considered the intestines solely as an organ of digestion. Today, it is viewed as a complex ecosystem in which billions of bacteria, fungi, and viruses form gut microbiome. Its balance or disruption directly affects human health. More and more research proves that dysbiosis can be one of the main triggers chronic diseases — from diabetes and cardiovascular diseases to autoimmune disorders.
The gut microbiome: its functions and importance
In a healthy person, the microbiota performs several critical functions: it participates in the digestion of food, regulates the immune response, synthesizes vitamins (groups B and K), and also maintains the barrier function of the intestinal mucosa. Any imbalance leads to a decrease in protective mechanisms, increased permeability of the intestinal wall and the initiation of systemic inflammation.
Link to chronic diseases
Obesity and metabolic syndrome. Studies have shown that the ratio of Firmicutes to Bacteroidetes in the microbiome affects the body's ability to absorb calories. An excess of the former is associated with obesity and accumulation of adipose tissue.
Type 2 diabetes. Dysbiosis reduces the sensitivity of cells to insulin. Chronic low-level inflammation caused by pathogenic bacteria is one of the key mechanisms in the development of diabetes.
Atherosclerosis and cardiovascular disease. The waste products of certain bacteria (e.g., TMAO) are associated with the formation of atherosclerotic plaques.
Autoimmune diseases. Dysbiosis can activate autoaggressive immune cells, triggering pathologies such as rheumatoid arthritis or multiple sclerosis.
Crohn's disease and ulcerative colitis. A decrease in the number of bifidobacteria and lactobacilli directly correlates with inflammatory lesions of the mucosa.
Mechanisms of influence on the body
The microbiome produces short-chain fatty acids, which are anti-inflammatory agents and an energy source for intestinal cells. Disruption of this process leads to the so-called «leaky gut» - increased permeability of the intestinal wall. This contributes to the entry of toxins into the bloodstream, which triggers a cascade of inflammatory reactions throughout the body.
Microbiome research methods
Modern laboratory diagnostics offers several methods: PCR (polymerase chain reaction) to detect specific bacteria, NGS (next-generation sequencing), which allows for a complete «map» of the microbiome, and metagenomic analysis, which assesses not only the composition but also the functional activity of microorganisms. These approaches are already being used for personalized dietary and therapeutic programs.
The relationship between the microbiome and chronic diseases
| Disease | The role of the microbiome | Biological mechanism |
|---|---|---|
| Adiposity | Excess Firmicutes, deficiency Bacteroidetes | More calories from food, change in appetite regulation |
| Type 2 diabetes | Reducing bacterial diversity | Chronic inflammation, insulin resistance |
| Atherosclerosis | TMAO production by intestinal bacteria | Accelerated plaque formation |
| Autoimmune diseases | Dysbiosis of immunomodulatory bacteria | Activation of autoaggressive cells |
| Intestinal diseases | Reduction of bifidobacteria and lactobacilli | Chronic inflammation of the mucous membrane |
Prevention and restoration of balance
Restoring a healthy microbiota is possible through several approaches. The most important are diet: sufficient fiber, fermented foods (yogurt, kefir, pickled vegetables) and foods with prebiotics (onions, garlic, bananas). Probiotics can help restore normal flora, but their effectiveness depends on the specific state and composition of the microbiome. It is also important to reduce the excessive use of antibiotics, which disrupt the balance of the intestinal ecosystem.
The future of research
Leading organizations, including the WHO and the Mayo Clinic, predict that microbiome analysis will become a routine part of preventive care in the coming years. Personalized diets, designed based on an individual's composition of intestinal bacteria, are emerging. Such approaches may be key to treating and preventing chronic diseases, reducing the need for aggressive drug therapy.
Gut microbiome — is more than just a digestive aid. It is one of the central regulators of health. Taking care of its balance today may be the best prevention of chronic diseases in the future.
