The gut is a complex ecosystem in which billions of microorganisms work closely together. Lactic acid bacteria, such as lactobacilli and bifidobacteria, play a particularly central role: They aid digestion, stabilize the gut flora, and are directly linked to the immune system. If this delicate balance is disrupted, it can affect numerous bodily functions —from nutrient absorption to mental stability.
It’s important to note that not all bacteria work the same way— different strains perform different functions in the gut. That’s why it’s worth taking a closer look: What functions do lactobacilli and bifidobacteria serve? How do they differ? And how can you specifically promote their growth? You’ll learn all about this in this article.
Lactobacillus: The Role of Lactobacilli
Lactobacillus refers to a group of lactic acid bacteria that occur naturally in the gut and other parts of the body. They are among the “good” gut bacteria and are essential for a healthy microbiome. Lactobacilli are particularly active in the small intestine , where they work closely with other microorganisms.
Her most important responsibilities include:
- Production of lactic acid: This process creates a slightly acidic environment (pH level) in the intestine, which can inhibit the growth of unwanted bacteria.
- Stability of the gut flora: They help maintain the balance between “good” and harmful bacteria. In this way, lactobacilli help keep the gut flora healthy and resilient.
- Supporting digestion: They help the body process certain food components and promote healthy bowel function.
What are bifidobacteria, and why are they important?
Like lactobacilli, bifidobacteria are also an integral part of a healthy microbiome. However, they primarily colonize the large intestine , where they play a key role in maintaining the balance of the gut flora. But they also perform important functions that go far beyond mere digestion:
- Production of lactic acid: Like lactobacilli, they lower the pH level in the gut, thereby preventing the growth of harmful bacteria.
- Utilization of dietary fiber: It helps break down food components, thereby promoting digestion and bowel function.
- Nourishment of the intestinal mucosa: The short-chain fatty acids produced during this process serve as an important source of energy for the intestinal cells.
- Support for the immune system: Because they interact closely with the immune system, they help stabilize immune cells in the gut and regulate inflammatory processes.
Lactobacilli and Bifidobacteria—What's the Difference?
Lactobacilli and bifidobacteria are types of lactic acid bacteria and are important components of a healthy gut flora. However, they play different roles in the body:
| Lactobacilli | Bifidobacteria | |
|---|---|---|
| Main Place of Operation | especially the small intestine | especially the large intestine |
| Effect on the intestinal environment | promote an acidic environment in the small intestine | promote an acidic environment in the large intestine |
| Key Features | - Formation of lactic acid - Inhibition of germs through pH regulation |
- Formation of short-chain fatty acids - Fermentation of dietary fiber - Defense against pathogens |
While lactobacilli primarily produce lactic acid in the small intestine, bifidobacteria produce short-chain fatty acids in the large intestine. It is precisely these different areas of activity that create a synergistic effect that is particularly beneficial for gut health. Together, they help maintain long-term balance in the gut.
What foods contain bifidobacteria and lactobacilli?
Lactobacilli and bifidobacteria are found in various fermented foods. These include, among others, yogurt, kefir, sauerkraut, kimchi, kombucha, and pickled vegetables. These lactic acid bacteria are produced during the fermentation of these foods and can colonize your gut. Therefore, fermented foods are a natural source of lactic acid bacteria and can make a valuable contribution to gut health.
The problem is that the quantity and variety of bacteria contained in these products vary considerably depending on the product. At the same time , many conventional foods are heated to very high temperatures, which kills the beneficial microorganisms. Another point: Because they are not sufficiently resistant to stomach acid , not all microorganisms reach the intestines alive. That’s why it can be helpful to supplement your intake in a targeted way. The following products are suitable for this purpose:
- Pro EM san provides you with 31 strains of probiotic bacteria plus fermented herbal and plant extracts.
- Pro Biom Anti-Stress contains 3 selected bacterial cultures, as well as saffron and biotin.
- Pro Basan Complete provides 12 strains of bacteria, soluble fiber, and all 8 B vitamins.
Lactobacilli and Bifidobacteria—Why Are Specific Strains of Bacteria So Important?
Not all bacteria act the same way. There are also important differences even among lactobacilli and bifidobacteria. In microbiology, we distinguish three levels:
- Genus: e.g., Lactobacillus – describes a higher-level group of bacteria
- Species: e .g., Lactobacillus rhamnosus – classified within the genus
- Strain: e.g., Lactobacillus rhamnosus GG —a specific variant within a species and the key factor in its health benefits in the body
While genus and species provide a basic classification, it is the strain, above all, that determines the function within the body. This is because even within a single species, individual strains can differ significantly—for example, in their stability, their ability to colonize the gut, or their role within the microbiome.
This also explains why probiotics can have such varied effects. The key is a carefully designed combination of different strains that complement each other in their functions. This is exactly where Pro EM comes in: With 31 bacterial strains, it covers a broad spectrum of different functions that can holistically support the balance of the gut flora.
Conclusion: Why Lactic Acid Bacteria and Their Strains Are Crucial
Both lactobacilli and bifidobacteria are key components of a healthy gut microbiota. They perform different functions that complement one another—from regulating pH levels and breaking down dietary fiber to supporting the immune system. What matters is not only that they are present in the gut at all, but above all the diversity and balance in which they occur.
The selection and diversity of bacterial strains are also particularly important here. This is because even within a single genus, their effects vary from strain to strain and can differ significantly. The combination of a mindful diet that includes fermented foods and high-quality probiotics such as Pro EM san therefore forms the foundation for strengthening the microbiome and supporting long-term gut health.
Sources
- Vanessa Liévin-Le Moal, Alain L. Servin. Anti-Infective Activities of Lactobacillus Strains in the Human Intestinal Microbiota: From Probiotics to Gastrointestinal Anti-Infectious Biotherapeutic Agents. Clin Microbiol Rev. 2014. 167–199. doi: 10.1128/CMR.00080-13. https://pmc.ncbi.nlm.nih.gov/articles/PMC3993101/
- K. Honda and D. R. Littman, “The microbiome in infectious disease and inflammation,” Annu. Rev. Immunol., vol. 30, pp. 759–795, 2012, doi: 10.1146/annurev-immunol-020711-074937. https://www.researchgate.net/publication/221728862_The_Microbiome_in_Infectious_Disease_and_Inflammation
