When we talk about digestive health, we often think of probiotics first, but there is another group of compounds that is just as important and much less well-known: prebiotics. Without them, even the best probiotics in the world could not do their job properly. In this article, we explain what prebiotics are, how they differ from probiotics, what benefits they provide to your microbiota, and how to incorporate them into your day-to-day life, whether through food or a supplement.

What are prebiotics?

Prebiotics are a type of plant fiber that the human body cannot digest on its own, but which serves as food for the beneficial bacteria that live in our gut. When these fibers reach the colon intact, the microbiota ferments them and produces short-chain fatty acids, compounds that play a key role in gut health, the immune system, and even mood.

The most studied types of prebiotics are inulin, fructooligosaccharides (FOS), galactooligosaccharides (GOS), and resistant starch. All of these are present naturally in plant-based foods, although they can also be taken as a supplement when the diet does not provide enough.

Prebiotics vs. probiotics: the key difference

It is common to confuse both concepts, so it is worth clarifying with a simple image: if the gut microbiota were a garden, probiotics would be the seeds or the plants that we sow (live microorganisms, such as certain strains of Lactobacillus or Bifidobacterium), while prebiotics would be the fertilizer that feeds them and allows them to grow.

In other words, probiotics provide good bacteria from the outside, and prebiotics nourish those we already have inside, encouraging them to multiply and displace less beneficial species. That is why many experts recommend combining both—what is known as a symbiotic approach—to obtain more comprehensive results for digestive health. You can see our selection of live ferments in the probiotics collection.

Benefits of prebiotics for digestive health

Incorporating enough prebiotic fiber into your diet has been linked to several benefits backed by scientific evidence:

Improve transit and reduce bloating

By increasing stool volume and stimulating intestinal movement, prebiotics help fight occasional constipation and maintain more regular digestion.

Promote mineral absorption

Some studies suggest that the fermentation of prebiotics such as inulin improves the absorption of calcium and magnesium, which is especially interesting for bone health.

Strengthen defenses

About 70% of the immune system resides in the gut. A well-fed and balanced microbiota helps maintain a strong intestinal barrier and a more efficient immune response.

Contribute to appetite balance

The fermentation of prebiotics stimulates the production of hormones related to satiety, which can help better control appetite throughout the day.

Foods rich in prebiotics

The good news is that many everyday foods in the Mediterranean diet are rich in prebiotic fiber. Some of the most notable are onion, garlic, leek, artichoke, asparagus, unripe banana, oats, and legumes. Introducing these foods gradually is key, as a sudden increase in fermentable fiber can cause gas or discomfort in people with a sensitive gut.

Common mistakes when starting with prebiotics

Although prebiotics are safe for most people, it is easy to make some mistakes when incorporating them for the first time. The most common one is increasing the amount of fermentable fiber all at once, which can cause bloating, gas, or abdominal discomfort. The microbiota needs time to adapt, so it is recommended to introduce the foods or the supplement gradually over several weeks.

Another frequent mistake is not drinking enough water. Prebiotic fiber retains fluid in the gut, so good hydration is essential for it to perform its function well and not cause the opposite of the desired effect. Finally, many people expect immediate results, when in reality changes in the composition of the microbiota are usually noticed after two or three weeks of consistent use.

When to take a prebiotic supplement?

Although it is ideal to obtain prebiotic fiber from food, there are situations where a supplement can be useful: after a course of antibiotics, when the diet is low in vegetables and legumes, in people with irritable bowel syndrome under professional supervision, or simply as specific support for digestive health during times of increased stress or changes in routine.

If you choose a supplement, start with a low dose and increase it gradually so that your microbiota adapts without discomfort. And remember that, as with any supplement, it is advisable to consult with a healthcare professional if you have any pre-existing digestive condition or are taking other medication.

Take care of your microbiota with AndaVida

Prebiotics are the foundation upon which a healthy microbiota is built: without them, even the best probiotics cannot perform at their best. Taking care of your diet, including vegetables rich in fermentable fiber, and, if you need it, relying on a quality supplement are simple steps that make a big difference in your long-term digestive well-being.

At AndaVida, you will find a selection of products designed to support you in taking care of your digestion and your microbiota. Discover our full range at andavida.es and take the next step toward stronger gut health.