Bread is one of the oldest foods in the world, but in modern times, more and more people are complaining about digestive issues related to gluten or other additives in baked goods. In this context, nutritionists have brought back into discussion sourdough bread, considered by many to be a healthy alternative to industrial bread. Among the medical voices supporting its benefits is Dr. Mihaela Bilic, a nutritionist known for her balanced approaches.
What Dr. Bilic Says About Sourdough Bread
On her official Facebook page, Dr. Mihaela Bilic clearly stated:
Sourdough bread is much easier to digest than yeast bread because slow fermentation helps with the predigestion of gluten and reduces the content of fermentable sugars.
This statement is based on the biochemical processes that the dough undergoes during natural fermentation. In contrast to industrial yeast, which acts quickly, sourdough involves a slow fermentation process, often lasting 12-48 hours, which has multiple advantages for the digestive system.
What Happens During Sourdough Fermentation
Sourdough bread is obtained through the natural fermentation of flour and water, without added yeast. During this process:
- microorganisms (lactobacilli and wild yeasts) partially break down gluten, making it easier to tolerate for sensitive individuals;
- fermentable sugars (FODMAPs) are reduced, which can cause bloating and intestinal discomfort;
- the acidity resulting from fermentation improves the bioavailability of minerals (calcium, magnesium, zinc).
What Studies Say
- Journal of Agricultural and Food Chemistry (2004) – a study showed that sourdough fermentation significantly reduces the amount of gluten compared to traditional yeast bread.
- Clinical Gastroenterology and Hepatology (2011) – researchers observed that individuals with non-celiac gluten sensitivity tolerated sourdough bread better due to the predigestion of proteins.
- European Journal of Nutrition (2017) – slow fermentation promotes better nutrient absorption and reduces the glycemic index of bread.
Benefits of Sourdough Bread
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Easier Digestion
The slow fermentation specific to sourdough leads to the production of natural enzymes that help break down gluten and complex starches, making the final product easier for the digestive system to process. Thus, the stomach exerts less effort during digestion, which can be especially beneficial for individuals with digestive sensitivity. Additionally, the prolonged fermentation process allows for the predigestion of carbohydrates and proteins in the flour, reducing the risk of feeling heavy. It is also better tolerated by individuals suffering from irritable bowel syndrome. Compared to regular bread, sourdough produces fewer unwanted fermentations in the colon, resulting in increased intestinal comfort. -
Reduced Risk of Bloating
One of the main reasons many people avoid bread is excessive bloating. Sourdough bread significantly reduces this problem because natural fermentation reduces FODMAPs, sugars that ferment quickly in the intestine and cause gas. Studies show that the natural fermentation process reduces these sugars by up to 90%, resulting in much less abdominal discomfort. Additionally, the modified protein structure allows this bread to be digested more slowly without overloading the gastrointestinal system. Individuals with slow digestion or intestinal sensitivity have reported better tolerance to sourdough bread than to industrial bread. -
Improved Gut Flora
Sourdough bread results from a fermentation process that involves lactobacilli, beneficial bacteria that contribute to the balance of the intestinal microbiota. Even though many of these bacteria die during baking, their metabolic products (postbiotics) remain in the bread and provide health benefits for the intestines. These substances can stimulate the secretion of protective intestinal mucus and help reduce chronic inflammation in the colon. Additionally, some studies suggest that regular consumption of fermented products contributes to the diversity of intestinal bacteria, an important indicator of overall health. Furthermore, the fibers and compounds resulting from fermentation can have a prebiotic effect, stimulating the good bacteria in the intestine. -
More Stable Blood Sugar
Another notable benefit of sourdough bread is its lower glycemic index, which means a slower and more controlled increase in blood sugar levels after consumption. This effect is due to both the slow fermentation and the structure of the dough, which slows down carbohydrate absorption. Studies show that sourdough bread leads to a lower insulin secretion compared to classic white bread. Individuals with diabetes or at risk of type 2 diabetes may benefit from better blood sugar control by including this type of bread in their diet. Additionally, the level of satiety is higher, which helps avoid unhealthy cravings between meals. -
Better Mineral Absorption
An often-overlooked aspect is that flour contains phytic acid, a compound that binds essential minerals and hinders their absorption in the body. Natural fermentation with sourdough breaks down a large part of phytic acid, thus releasing minerals such as calcium, iron, zinc, and magnesium. This process makes sourdough bread more nutritious, even if it does not appear to differ much in ingredients from classic bread. Especially for individuals with mineral deficiencies, consuming this type of bread can provide more valuable nutrients. Additionally, this increased bioavailability of minerals contributes to maintaining bone health, immune system function, and nerve functions.
Contraindications
- Celiac Disease: Although it has less gluten, sourdough bread is not safe for individuals with celiac disease, as it does not completely eliminate gluten.
- Severe Gastroesophageal Reflux: The acidity produced during fermentation can irritate a sensitive stomach in some cases.
- Allergies to Molds or Yeasts: The natural fermentation process may promote the growth of some microorganisms to which some individuals are allergic.
- Advanced Diabetes: Although it has a low glycemic index, it should be consumed in moderation.
Sources:
- Facebook – Dr. Mihaela Bilic: post from June 14, 2024
- Journal of Agricultural and Food Chemistry – Sourdough fermentation reduces gluten content in wheat products
- Clinical Gastroenterology and Hepatology – Tolerance to sourdough bread in non-celiac gluten sensitivity
- Applied and Environmental Microbiology – FODMAP degradation by lactobacilli during sourdough fermentation
- European Journal of Nutrition – Effect of sourdough fermentation on nutrient bioavailability and glycemic response
