Inside your gut lives a community of trillions of microorganisms that, put together, weigh between 1.5 and 2 kilograms: roughly the same as your brain. Science calls it the gut microbiota, and today it is considered an additional organ, capable of interacting with the immune system, metabolism, and even mood. In recent years, research has multiplied studies on "gut flora", probiotics and prebiotics, and with them, questions have also grown from those who want to take care of their gut health consciously.
In the following guide, you will find clear and science-based answers: you will discover what the microbiota is, how it works, what habits challenge it, and what daily actions (at the table and beyond) help you keep it in balance.
What is the gut microbiota and what is it made of?
The gut microbiota is the set of microorganisms that populate the digestive tract: predominantly bacteria, but also viruses, fungi, yeasts, and archaea. Most of them are concentrated in the colon, where they find the ideal environment to nourish and multiply, while the stomach and small intestine host smaller quantities. These are not unwanted guests: the coexistence between the human body and its microorganisms is the result of millions of years of shared evolution, a true symbiosis in which both parties benefit.
To navigate the terms you encounter online, on supplement labels, or in popular science articles, it's worth establishing the basic terminology right away.
Microbiota, microbiome, and gut flora: the differences
The three terms are often used interchangeably, but they refer to different things. The microbiota is the collection of microorganisms itself, the living population. The microbiome, on the other hand, is their entire genetic heritage, meaning the millions of genes that encode the functions performed by these microorganisms (a heritage approximately 150 times larger than the human genome).
Finally, the expression "gut flora" belongs to common parlance but is scientifically outdated: it originated when bacteria were classified in the plant kingdom, as if the intestine hosted a small forest.
How unique is your microbiota?
The composition of the microbiota is as personal as a fingerprint. It forms from birth (the type of birth and breastfeeding influence its first colonies) and continues to be shaped throughout life based on diet, environment, medications, physical activity, and age.
Two healthy people can have very different microbial profiles: there is no "perfect" microbiota that is the same for everyone, and normal individual variability should not worry you.
What matters, as you will see shortly, is microbial diversity: the richer and more varied the ecosystem, the more stable and resistant it tends to be to disturbances.
How the gut microbiota works in our body
The microbiota is not a silent passenger: it works for you every day. Its primary function concerns digestion: gut bacteria ferment the dietary fibers that your enzymes cannot break down and, in doing so, produce short-chain fatty acids (like butyrate) that nourish the cells of the colon wall and contribute to its well-being. Intestinal microorganisms also participate in the synthesis of certain vitamins, including vitamin K and several B vitamins, and contribute to the absorption of minerals like calcium and magnesium.
There is also a protective role: a healthy microbial community occupies available space and resources, thus hindering the establishment of potentially harmful microorganisms (a mechanism known as the "barrier effect").
At the same time, the microbiota helps maintain the integrity of the intestinal barrier, that thin layer of cells and mucus that separates the contents of the intestine from the rest of the body.
Eubiosis and dysbiosis: the balance that makes a difference
When different microbial species coexist in harmonious proportions and diversity is high, it is called eubiosis: this is the state of balance associated with gut health. However, when some species take over, others decrease, and overall variety declines, it is called dysbiosis. Dysbiosis is an imbalance that can be accompanied by digestive discomfort (bloating, irregularity, heaviness) and that research is studying in relation to numerous physiological events.
Understanding the factors that shift the balance towards one state or the other is the first step to taking action: you will see them in detail in a few paragraphs.
Why the gut microbiota is important for gut health
If the microbiota were merely an aid to digestion, it would not have become one of the most studied topics in contemporary medicine. Its influence extends far beyond the intestine and touches at least three major areas: immune defenses, psychophysical well-being, and metabolic balance.
On this last front, research has been observing the link between microbial composition, glucose management, and nutrient metabolism for years: one more reason why the intake of fiber in the diet (which we will discuss in the practical section) plays a leading role. The other two areas deserve dedicated exploration.
Microbiota and the immune system
Approximately 70% of the body's immune cells reside in the gut-associated lymphoid tissue. This is no coincidence: the intestine is the largest contact surface between the body and the external world, and it is there that the immune system learns to distinguish between what is harmless and what is not.
Scientific research has long studied the relationship between the gut microbial community and the first years of an organism's life, a phase in which the intestine plays a central role in development. This is a continuously evolving area of investigation, which helps to understand how interconnected the intestinal ecosystem is with the entire organism.
The latest nutraceutical research is keenly exploring the link between nutrition and defenses: an example is Esserre's research in the field of immuno-nutrition.
The gut-brain axis and psychophysical well-being
The gut and brain communicate constantly through a network of nervous connections (primarily the vagus nerve), hormonal, and immune pathways known as the gut-brain axis. The microbiota participates in this conversation.
This is why emotions are felt "in the gut" and why, conversely, a disordered gut can affect mood, energy, and sleep quality. Research on the gut-brain axis is still evolving, but one point is already clear: taking care of your gut also means taking care of your psychophysical balance.
What alters the gut microbiota: the main risk factors
The intestinal ecosystem is resilient, but not invulnerable. Certain habits and circumstances of modern life can reduce its diversity and promote dysbiosis. Knowing them helps you recognize risk situations in your daily life, without alarmism: in most cases, the microbiota has good recovery capabilities, provided it is supported by the right choices.
Antibiotics and other medications
Antibiotics are valuable drugs and, when prescribed by a doctor, should be taken confidently and until the end of the therapy. Their effect, however, does not distinguish between pathogenic bacteria and beneficial bacteria: an antibiotic therapy can temporarily reduce the diversity of the microbiota, with possible intestinal discomfort during treatment days and in the following weeks. Other commonly used drugs (some proton pump inhibitor antacids, anti-inflammatory drugs taken for long periods, habitually used laxatives) can also affect the intestinal environment.
The golden rule is twofold: conscious and never self-prescribed use of medications, and attention to restoring balance once therapy is completed, with the support of an adequate diet and targeted supplementation agreed upon with a professional.
Unbalanced diet and lifestyle
Your bacteria eat what you eat. A diet low in fiber and rich in ultra-processed foods, simple sugars, and low-quality fats gradually depletes beneficial species, which are left without their preferred nourishment, and favors less desirable ones.
Diet plays a large part, but not all: sedentary lifestyle and poor hydration also affect the intestine, as they slow down motility and alter the environment in which microorganisms live. The link between daily habits and bowel regularity is well documented: slow transit and hard stools are often the first sign that something in the lifestyle needs correction.
Stress, sleep, and other daily factors
The gut-brain axis works in both directions: just as the gut influences mood, chronic stress influences the gut. Prolonged release of cortisol can alter motility, increase intestinal barrier permeability, and modify the microbiota's composition.
The same applies to sleep: insufficient or poor sleep disrupts circadian rhythms, to which gut bacteria are also sensitive. Smoking, excessive alcohol consumption, and, to a lesser extent, changes in routine like long-distance travel, also contribute to the overall picture. The good news? Each of these factors can be managed, and every improvement (even small) is reflected in the intestinal ecosystem.
A comprehensive prevention perspective, in line with the philosophy you find in the Esserre Wellness Guide.
How to tell if your microbiota is out of balance
Dysbiosis cannot be evaluated in the mirror, but some signs may suggest that your gut balance is under pressure: recurrent abdominal bloating, irregular transit (constipation, episodes of diarrhea, or alternation between the two), slow digestion, persistent fatigue without apparent causes, and even mood changes.
These are clues, not diagnoses: the same signs can depend on many different conditions. If the discomfort is intense, has lasted for weeks, or is accompanied by unusual signs (severe abdominal pain, unintentional weight loss, blood in the stool), consult your doctor without hesitation.
For mild and occasional disturbances, however, the dietary and lifestyle strategies found below are the most sensible starting point.
How to take care of your gut microbiota step by step
Let's get to the practical part. Taking care of your microbiota does not require extreme regimes or drastic changes: it requires consistency in a few daily actions. You can imagine the process in three progressive steps: nourishing beneficial bacteria with the right fibers, enriching your diet with fermented foods, and supporting it all with an active and serene lifestyle.
Let's look at them one by one.
Foods rich in fiber and prebiotics
Prebiotics are non-digestible substances (mostly soluble fibers) that reach the colon intact and serve as nourishment for beneficial bacteria, stimulating their growth and activity.
The best sources are found in everyday pantries:
● vegetables such as artichokes, onions, garlic, leeks, and asparagus;
● legumes such as chickpeas, lentils, and beans;
● whole grains such as oats, barley, and spelt;
● fruit such as bananas, apples, and berries, as well as dried fruit and seeds.
The target intake is at least 25-30 grams of fiber per day, which should be achieved gradually to allow the intestines time to adapt.
A practical tip in line with the healthy cooking you love: focus on vegetable variety, because each plant nourishes different bacterial families, and the more colors you put on your plate, the more your microbial diversity will thank you.
Fermented foods and lactic ferments
In addition to fiber, fermented foods bring live microorganisms and beneficial compounds produced by fermentation: yogurt with live cultures, kefir, unpasteurized sauerkraut, miso, tempeh, and kombucha tea. Incorporating them into your routine is simple and tasty: yogurt for breakfast with fruit and oats, a spoonful of sauerkraut as a side dish, kefir as a snack.
Fermented foods provide lactic ferments in varying quantities and strains depending on the product and fermentation process, and represent a simple and pleasant way to enrich the variety of one's daily diet.
Hydration, exercise, and stress management
The third step concerns everything that happens outside the plate. Drinking enough water (about 1.5-2 liters per day, more if you exercise or it's hot) keeps stools soft and supports transit. Regular exercise stimulates intestinal motility and, according to recent studies, is associated with greater microbial diversity: just 30 minutes of brisk walking almost every day is enough to achieve concrete benefits. Finally, make time for stress management: deep breathing, meditation, yoga, time in nature, or simply real breaks during the workday.
Sleeping 7-8 hours at regular times completes the picture. These are simple actions that, when combined, build the foundation of your bowel regularity and general well-being.
Probiotics, prebiotics, and supplementation: what to know before choosing
When diet alone is not enough (or when everyday life complicates good intentions), targeted supplementation can support intestinal balance. To choose wisely, start with the definitions:
● Probiotics are living microorganisms which, when consumed in adequate amounts, confer a health benefit on the host.
● Prebiotics are the fibers and substances that nourish them.
● Synbiotics combine both in the same formulation, while postbiotics (the most recent frontier of research) are the beneficial compounds produced by bacteria or derived from inactivated microorganisms.
In the section dedicated to intestinal well-being you will find solutions formulated based on these principles, with an approach that combines science and naturalness.
How to read a supplement label
For those who, like you, are used to doing their research before buying, the label is a mine of information.
In probiotics, check for the indication of strains with full nomenclature (genus, species, and strain designation, for example "Lactobacillus rhamnosus GG"): it is the strain, not the generic species, that determines the studied properties.
For prebiotic fibers, observe the type of fiber, its solubility, and the possible presence of supporting studies.
The clarity of the usage instructions completes the criteria for an informed choice: these are the same values of scientific rigor and transparency that guide Esserre's way of working.
When targeted support can be useful
Supplementation is not a daily requirement for everyone, but there are times when support makes particular sense:
● after antibiotic therapy, to aid the recovery of microbial diversity;
● during periods of intense stress or disordered eating (travel, deadlines, seasonal changes);
● when the intake of fiber from diet alone remains far from the recommended 25-30 grams, a common situation;
● when traveling, when water, food, and routines change.
In any case, consultation with a doctor, nutritionist, or pharmacist remains the compass: a professional can indicate the right solution for your needs, and this is the most consistent choice for a responsible approach to health. Supplements, we remind you, should not be understood as substitutes for a varied and balanced diet and a healthy lifestyle.
NutraMet Fibra: soluble fiber support for intestinal balance
Among the solutions based on prebiotic fibers, NutraMet Fibra by Esserre is a concrete example of how science can translate into a simple daily gesture. It is a dietary supplement based on resistant dextrins from wheat starch: soluble prebiotic functional fibers, consisting of non-digestible carbohydrates, which promote the balance of intestinal bacterial flora.
Resistant dextrins also have another studied property: thanks to the presence of non-digestible carbohydrates instead of sugars, NutraMet Fibra contributes to a lower increase in blood glucose after meals compared to foods containing sugars.
Finally, the formulation is designed for real life: soluble, tasteless, and well-tolerated by the body at the digestive level, it lends itself to regular intake without causing bloating or intestinal discomfort. You can dissolve it in a glass of water, or add it to yogurt, smoothies, or other hot or cold dishes, without altering their taste.
It is available in single-dose sachets (convenient for on-the-go, also in the 40-sachet format) and in a jar with a measuring scoop for home use.
Dietary supplements should not be understood as substitutes for a varied and balanced diet and a healthy lifestyle, nor for drug therapy. It is recommended not to exceed the recommended daily dose. For usage instructions, refer to the label.
Frequently Asked Questions (FAQ)
How long does it take for the microbiota to rebalance?
There is no single timeline for everyone. The microbiota responds to dietary changes within just a few days, but a stable rebalance (e.g., after antibiotic therapy) generally takes a few weeks to a few months, depending on the extent of the imbalance, age, and lifestyle. The decisive variable is consistency: good habits maintained over time count more than any intensive but occasional intervention.
Are probiotics and lactic ferments the same thing?
Not exactly. "Lactic ferments" is a generic term that refers to microorganisms capable of fermenting lactose, such as those in yogurt, whether live or not at the time of consumption. Probiotics, on the other hand, are live and viable microorganisms, belonging to selected and studied strains, which reach the intestine actively in adequate quantities. All probiotics are ferments, but not all ferments meet the requirements to be defined as probiotics.
Can the microbiota be improved solely through diet?
Diet is the fundamental lever: a varied diet rich in fiber, plant foods, and fermented foods nourishes beneficial bacteria daily. In many situations, this is sufficient. However, when fiber intake remains below requirements, or during particular phases (after antibiotics, during periods of intense stress), supplementation with prebiotic fibers or probiotics can complement the diet. The winning approach is combined and personalized: diet as a base, supplementation as targeted support, and a healthcare professional as a guide.
