Our gut is the most densely populated place in the world
Trillions of microorganisms live in our gut, together forming the gut microbiome. The gut, microbiome, and brain are connected through various signaling pathways. What happens in the gut and what role does the microbiome play? Here I have put together a few interesting facts for you!
The power of the intestinal barrier should not be underestimated
The surface of the gut is greatly enlarged by numerous folds and protrusions. This allows the body to efficiently absorb nutrients and liquids. At the same time, the intestinal wall must prevent harmful microorganisms and other unwanted substances from entering the body uncontrollably. Various protective mechanisms help with this:
- the microbiome (formerly also called "gut flora")
- the intestinal mucosa
- the gut-associated immune system (GALT, from the English "gut-associated lymphoid tissue")
Together, these protective mechanisms contribute to the intestinal barrier. They help to ward off pathogens and maintain the balance between the gut and the immune system. Stomach acid already inactivates a portion of the ingested microorganisms. Further protective mechanisms are located in the gut itself: these include the mucus layer, the intestinal wall, and immune cells that can recognize and fight pathogens.
The GALT, the largest collection of important defense cells
The gut-associated immune system – also called GALT – is located largely in the intestinal mucosa and is an important part of our immune system. The gut also performs central tasks in digestion and nutrient absorption. The gut and brain communicate with each other via the so-called gut-brain axis. This complex exchange involves nerve connections, metabolic products, and various messenger substances, among others.
Prebiotics and probiotics: The basics for the gut & microbiome
Prebiotics
Prebiotics are substances that are specifically utilized by certain microorganisms in the body and can therefore provide a health benefit. Many prebiotics are certain types of fiber. They are not or not completely broken down by human digestive enzymes and can serve as food for gut bacteria.
Prebiotic-active fibers and other corresponding food components are found, for example, in chicory, onions, garlic, asparagus, certain types of grain, and bananas. Not every fiber is automatically a prebiotic; its properties and proven effect are decisive.
Probiotics
Probiotics are live microorganisms that provide a health benefit when consumed in sufficient quantities. Whether a microorganism can be classified as a probiotic depends, among other things, on its identity, the amount used, and scientific evidence.
Fermented foods such as yogurt, kefir, kimchi, or unpasteurized kombucha can also contain live microorganisms. However, this does not automatically make them a probiotic.
Sourly pickled or fermented vegetables can also contain live microorganisms depending on the manufacturing process and thus bring additional diversity to a varied diet.
The gut microbiome is connected to numerous processes in the human body. A balanced diet with sufficient fiber provides various substrates that can be utilized by microorganisms in the large intestine. What effect this has on the microbiome depends, among other things, on the overall diet and the individual composition of the microbiome.
The gut and brain are in close communication!
Researchers are intensively investigating how the gut and brain communicate with each other through various signaling pathways and what role the gut microbiome plays in this. This so-called gut-brain axis includes nerve connections, metabolic products, and various messenger substances, among others. Research continues to investigate how these complex interactions are connected to stress, mood, and other physical processes. Many connections are not yet fully clarified.
Gut microbiome: The most important points summarized
- Intestinal barrier: The intestinal mucosa, microbiome, and immune system work together to protect the body from pathogens.
- Prebiotics: Certain fibers and other food components can be utilized by selected gut microorganisms.
- Probiotics: They contain defined live microorganisms for which a health benefit is proven when consumed in sufficient quantities.
- Fermented foods: They can contain live microorganisms and fermentation products, but are not automatically probiotics.
- Gut-brain axis: The gut and brain are connected through several signaling pathways. The role of the gut microbiome is being further researched.
Frequently asked questions about the gut microbiome
What is the gut microbiome?
The gut microbiome includes the community of microorganisms in the gut and their genetic information. This includes, among others, bacteria, viruses, and fungi. This community is connected to various processes in the body.
What is the difference between prebiotics and probiotics?
Prebiotics are substances that can be specifically utilized by certain microorganisms. Probiotics are live microorganisms for which a health benefit is proven when consumed in sufficient quantities.
Are fermented foods automatically probiotic?
No. Fermented foods can contain live microorganisms. However, whether a product can be considered probiotic depends on the microorganisms it contains, their quantity, and the scientific evidence for a health benefit.
What is the gut-brain axis?
The gut-brain axis describes the communication between the gut and brain through nerve connections, messenger substances, and other signaling pathways. What role the gut microbiome plays in individual processes is the subject of ongoing research.
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