Postbiotics

Postbiotics is a category of bioactive compounds where microbial metabolites contribute to health, using mechanisms that do not involve live microorganisms.

This article is part of the complete guide to proper nutrition — a fundamental guide from the expert team at Sport Zona.

What It Is

Postbiotics represent functional components derived from microorganisms, including both non-living microbial cells and/or their metabolic products, which benefit the host's health. Unlike probiotics, which are live microorganisms, postbiotics do not contain live bacteria, making them more stable and with a longer shelf life. This stability is a key characteristic that allows for easier application in dietary supplements and fortified foods.

Biochemically, the composition of postbiotics is diverse and can include short-chain fatty acids (SCFAs) such as butyrate, propionate, and acetate, as well as various enzymes, cell walls, polysaccharides, peptides, vitamins, and other organic acids. Their production occurs through controlled fermentation of probiotic strains, followed by an inactivation process (heat treatment, ultrafiltration, or other methods) that ensures the absence of live microorganisms while preserving the biological activity of the beneficial components.

How It Works

The mechanism of action of postbiotics is due to the direct interaction of their bioactive compounds with the host's cells and tissues, without the involvement of live microorganisms. These compounds can be absorbed by the gastrointestinal tract and reach systemic circulation, exerting effects in various organs. Their main contribution is related to modulating the immune response, supporting intestinal barrier function, and antioxidant properties.

• Immune Response Modulation: Some postbiotic components, such as cell wall fragments and nucleotides, interact with immune cells in the intestinal lining, stimulating the production of cytokines and antibodies that enhance defense against pathogens.
• Intestinal Barrier Support: Short-chain fatty acids, especially butyrate, are a primary energy source for enterocytes (intestinal lining cells) and help maintain the integrity of the intestinal barrier, preventing "leaky gut."
• Antioxidant and Anti-inflammatory Effects: Some postbiotics exhibit antioxidant properties, neutralizing free radicals, and reduce the production of pro-inflammatory mediators, which is particularly important after intense training.
• Pathogen Neutralization: Through the production of antimicrobial peptides and other substances, postbiotics can directly inhibit the growth of harmful bacteria without being alive.

Why It's Important for Athletes

For athletes, intense physical exertion often leads to states of increased oxidative stress, inflammation, and impaired intestinal function, known as "runner's gut." In these situations, postbiotics offer an effective and stable way to maintain health and optimize recovery. Scientific data suggest that their intake can help improve immune function, which is essential for preventing upper respiratory tract infections, common in athletes after competitions or heavy training periods.

Postbiotic intake can also contribute to reducing inflammatory processes in the body, accelerating recovery from muscle damage and reducing post-exercise pain. Improving intestinal barrier function is crucial, as it prevents toxins from entering the bloodstream from the gut, which can cause systemic inflammation and compromise athletic performance. Although there are no established daily reference values (RDA) for postbiotics yet, studies use doses between 100 mg to 500 mg per day of postbiotic compounds, with the specific dosage depending on the type and concentration of active components and the goals of intake; consultation with a qualified specialist is often recommended.

Related Concepts

• Prebiotics — Nutrients that feed beneficial gut bacteria, complementing the action of postbiotics by promoting the production of similar metabolites.
• Probiotics — Live microorganisms, whereas postbiotics are their non-living metabolic products; both work to improve gut health.
• Microbiome and Nutrition — The gut microbiome is a source of postbiotics, and nutrition directly influences their composition and production.
• Nutrition for IBS — Postbiotics may play a role in alleviating IBS symptoms, similar to dietary interventions focused on gut health.