100% sourdough: health, sustainability, biodiversity

Bread is one of the oldest foods in our diet. Yet its production has changed profoundly over the past few decades. As processes have accelerated, natural fermentation has often been replaced by faster, more standardized methods.

Today, sourdough is making a strong comeback in artisanal kitchens and committed restaurants. Why this renewed interest? What does sourdough actually change in terms of taste, digestibility, and overall quality of bread?

At Entropy Restaurant, we set out to explore these questions through a workshop dedicated to sourdough bread, natural fermentation, and local flour. An immersion that allowed us to better understand how time, raw ingredients, and living processes shape a richer and more sustainable bread.

Sourdough or yeast: two visions of bread

The difference between sourdough and yeast is not just a baking technique. It reflects two fundamentally different approaches to fermentation.

Industrial yeast acts quickly. It allows dough to rise in one to two hours with predictable and consistent results. It is a tool designed for efficiency and standardization.

Sourdough, on the other hand, follows a natural logic. Made only from flour and water, it gradually develops an ecosystem of wild yeasts and lactic acid bacteria. This slow fermentation can take several hours, or even several days.

This time dimension deeply transforms the bread:

• more complex and nuanced aromas
• a softer crumb and a more balanced texture
• improved digestibility
• longer natural shelf life

Where yeast produces standardized bread, sourdough gives rise to a living, evolving product, deeply connected to its environment.

The benefits of sourdough bread

Beyond its taste qualities, sourdough bread also offers several nutritional advantages.

During fermentation, microorganisms begin breaking down part of the carbohydrates and proteins in the flour. This acts as a form of natural pre-digestion, which can make bread easier to digest for some people.

Slow fermentation also influences the glycemic index of bread. Sugars are absorbed more gradually by the body, helping to avoid sharp energy spikes followed by crashes.

Finally, sourdough improves the bioavailability of certain minerals. By naturally reducing compounds present in grains, it facilitates the absorption of iron, zinc, and magnesium.

Sourdough therefore does not only transform the taste of bread: it also changes the way our bodies interact with grains.

Flour: the true starting point

We often talk about sourdough, but much less about the flour that brings it to life.

Yet the quality of flour directly influences fermentation, the structure of the bread, and its aromatic richness. A good sourdough starts with good grain.

To better understand this fundamental aspect, our team visited Les Grands Blés, a Belgian mill committed to local and agroecological production.

There we discovered a supply chain that prioritizes:

• wheat grown in Belgium
• agriculture without pesticides or synthetic fertilizers
• cold stone milling that preserves the grain’s nutritional qualities

This approach produces a less standardized but more “alive” flour, capable of fully expressing the potential of natural fermentation.

The workshop reminded us of a often-forgotten truth: sourdough does not start with sourdough. It starts in the soil, in the choice of seeds, in wheat cultivation, and in how flour is produced.

Sourdough as a sustainable choice

The return of sourdough also fits into a broader reflection on food sustainability.

Thanks to its long fermentation, sourdough bread naturally keeps longer. It dries out less quickly and helps reduce food waste.

But the benefits go beyond the final product.

This approach also encourages:

• more respectful farming practices
• shorter supply chains
• less industrial processing
• better valorization of raw ingredients

Sourdough thus becomes a symbol of a more coherent food chain, where each step—from field to plate—regains meaning.

Looking back at our sourdough workshop

This Monday, the kitchen team at Entropy Restaurant took part in a discovery day at the Les Grands Blés mill.

The workshop continued with training led by Alice Crosby, a specialist in natural fermentation.

The goal was simple: understand sourdough through practice.

Observe fermentation, handle doughs, adjust resting times, feel different textures, and learn to work with living processes rather than trying to control them.

A rich experience that helped us better understand everything that happens behind a simple piece of bread.

From mill to plate: putting sourdough into practice

This reflection did not stop at the workshop.

Back in the kitchen, we began integrating these learnings into our recipes.

One of the first experiments focused on our lovage brioche. By replacing yeast with sourdough, we discovered a new expression of the product.

This change, seemingly technical, transformed the entire preparation logic:

• longer fermentation time
• a different organization of work
• a more complex texture
• enhanced aromatic depth

Sourdough imposes a different rhythm. It invites us to slow down, observe, and accept that some transformations cannot be accelerated.

This is precisely the philosophy that resonates with our vision of cooking: working with time rather than against it, valuing local ingredients, and allowing the living to express its full richness.

When time becomes an ingredient

In an era where everything moves faster and faster, sourdough reminds us that there is another way to produce, cook, and eat.

A slower, more local, and more respectful way.

Beyond bread itself, it tells a story: a renewed connection between land, grains, artisans, and the plate.

And sometimes, it only takes a little flour, water, and time to rediscover everything that bread can be.