How to Make Naturally Fermented Bread: The Complete Guide for Beginners

Making bread at home is one of the most therapeutic and rewarding activities there is. When we talk about natural fermentation, or the famous Sourdough, we enter a universe of complex flavors, crispy crusts and airy crumbs that no supermarket bread can replicate.
The ancient technique uses microorganisms present in the air and in flour to create 'Levain' (natural yeast). In this guide, we'll demystify the process and show you how you can master this art using the right conversion and timing tools.
What is Natural Fermentation?
Unlike dry or fresh biological yeast purchased in tablets, natural fermentation is based on a live culture of yeast and lactic acid bacteria. This culture is fed regularly with water and flour, creating a colony that makes the bread rise slowly and organically.
This slow process is what allows enzymes to break down the gluten and phytic acid in the grains, making the bread much easier to digest and with a lower glycemic index than industrial breads.
Why Choose Slow Fermentation Bread?
If you're still unsure whether it's worth the time invested, here are some reasons that convince anyone to start today:
- Incomparable Flavor: The lactic acid produced gives it that slightly sour and aromatic touch.
- Facilitated Digestion: The long fermentation process pre-digests the gluten for you.
- Natural Preservation: Bread lasts longer fresh due to the natural acidity of the process.
- Perfect Crusts: The caramelization of sugars during long fermentation creates incredible colors and textures.
- Economy: You only need flour, water and salt.
Step by Step: Your First Batch
To get started, you will need an active natural yeast. If you already have your 'bake' (as many bakers call the levain), follow these fundamental steps for a loaf of approximately 800g.
1. Mixing and Autolysis
Mix 400g of good quality wheat flour with 260g of water. Let rest for 30 minutes to 1 hour. This helps the gluten start to form on its own, making it easier to knead by hand.
2. Addition of Yeast and Salt
Add 80g of active natural yeast and 8g of salt. Mix the dough well with your hands until it is homogeneous. There is no need to knead excessively like regular French bread.
3. Folds and Block Fermentation
Every 30 minutes, make a series of 'folds' in the dough (pulling the edges towards the center). Repeat this 4 times. Then, let the dough rest until it doubles in size. This is where our fermentation calculator tool becomes essential for monitoring ideal times.
The secret of good bread is not in the strength of your arms, but in the patience of those who wait for time to act.
The Role of Temperature and Weather
Fermentation is a sensitive biological process. On hot days, the dough rises very quickly, which can compromise the flavor. On cold days, it may take hours longer to reach the ideal point.
This is why using measurement converters and fermentation calculators is vital. Adjusting the hydration of the dough (the proportion of water to flour) according to the air humidity and the temperature of your kitchen ensures that the result is always the same: a perfect loaf.
Tips for Success
- Use filtered or mineral water, as tap chlorine can inhibit yeast activity.
- Preheat your oven very well and, if possible, use an iron pan to bake.
- Have a digital scale; In artisanal baking, every gram counts.
- Don't give up if the first loaf doesn't turn out beautiful. Practice makes perfect.
Mastering natural fermentation is an ongoing learning journey. With the guidance in this guide and the support of our conversion tools at SizesGrid.com, you're ready to transform your kitchen into a true artisan bakery. Start today and feel the difference in your taste!

