Why are fermented foods good for our health?

Published Nov 27, 2021 • By Candice Salomé

Since the discovery of the role of the intestinal flora (microbiota) on our health, more and more is being said about fermented foods. They are said to be full of micro-organisms capable of supporting the balance of the microbiota and increasing the nutritional quality of our diet.

But what are fermented foods exactly? How do they really benefit our health? How can we incorporate them into our meals?

We tell you everything in our article!

Why are fermented foods good for our health?

What is fermented food? 

Fermented foods are the ones that have undergone a transformation process with the participation of microorganisms such as bacteria, yeast or filamentous fungi.

Fermentation is an ancient technique that lost ground with the arrival of refrigerators, freezers and sterilization. This technique was previously used to preserve foods and give them special taste, texture and appearance.

There are many types of fermentation. The best known are lactic fermentation and alcoholic fermentation. A large majority of foods can ferment (vegetables, fruit, milk, cereal, meat, etc.) spontaneously under certain storage conditions (using salt, protecting them from light or oxygen, etc.), or in a controlled manner when microorganisms are introduced deliberately (kefir, leaven, rennet, etc.). For example, sauerkraut, yogurt, cheese, wine, vinegar, pickles, or even sourdough bread are fermented foods. Fermentation causes a so-called “positive degradation”, or “maturing”.

During fermentation process, food becomes more and more sour because its pH changes. This prevents food degradation and the development of unwanted bacteria, yeast and fungi. When pH is sufficiently acidic (around 4), the preparation becomes stable and can be stored for a long period of time. But more importantly, such food has a lot of positive effects on our health.

What are the health benefits of fermented food? 

Fermentation improves food digestibility and its nutritional value. Ferments produce such useful compounds as vitamins and polyphenols, which increase antioxydant activities and contribute to cardiovascular health.

For example, sauerkraut is much better supplied with vitamin C than unfermented cabbage. It is also easier to digest because the fibers obtained after fermentation are less irritating to the intestine.

Moreover, by acidifying the food bolus, lactic fermentation releases mineral salts form cereals allowing better absorption of calcium, iron or magnesium.

Some studies have also shown that fermented tofu contains enzymes that dissolve blood clots responsible for myocardial infarction (heart attack).

Certain bacteria and yeast involved in food fermentation enrich the intestinal flora (microbiota). They are natural probiotics, that have real health benefits, as they boost the immune system and improve gut health.

As for cheese, thanks to all the microorganisms it contains, it has numerous anti-inflammatory properties, useful for the prevention of certain diseases. While cheeses like mozzarella and fresh cheese do not contain lots of microorganisms, semi-hard cheeses (such as Emmental), those with a bloomy rind (such as camembert or brie), washed rind (such as époisses) or blue mold cheeses (blue, roquefort) present an interesting microbial diversity. Do not hesitate to eat their rind, if it is thin and clean, because it contains the greatest number of bacteria and mold, which are good for our health.

What foods should we include in our daily diet and how can we ferment them at home? 


Sauerkraut is rich in vitamin C and is very digestible. It is easy to make: just take a cabbage, chop it, and place it in a jar filled with water and salt. And let it ferment!

>> Take a look at this recipe for homemade sauerkraut <<

Pickled vegetables

Cucumbers, lemons, gherkins, onions, turnips, beets, radishes or carrots… you can try various pickled vegetables. Thanks to their fermentation, they are rich in vitamins and antioxidants.

>> An easy recipe for quick pickled onions << 

Sourdough bread

Sourdough bread makes certain minerals, such as iron and magnesium, much more easily absorbed by our body.

Fermented dairy products 

Fermented dairy products are much more digestible than the unfermented ones. The lactose concentration in crème fraîche, yogurts and cheese will drop or even disappear completely under the effects of fermentation.

Some people who are not able to fully digest milk are considered to be lactose intolerant (most of the time), which means that they are intolerant to sugar found in milk. However, they can digest fermented dairy products much more easily.

Milk kefir 

Milk kefir is a very digestible preparation which boosts the immune system. To get milk kefir, you just need to ferment kefir grains in milk. Kefir grains are small white grains that contain billions of microorganisms that turn milk into kefir. Thus, as with the fermented dairy products, the fermentation process will reduce the amount of lactose in milk, which will make it much more digestible.

>> Learn how to make homemade kefir << 

Water kefir 

Water kefir is full of vitamins and antioxidants. Kefir grains, added to sweetened water and fruit, increase health benefits of the fruit.

>> Everything about water kefir <<  

Fermentation makes food more digestible and increases its nutritional value. However, there are no miracle foods. Fermented foods should be part of a balanced diet. And, of course, it is essential to moderate your consumption of beverages that undergo alcoholic fermentation, such as wine or beer!

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avatar Candice Salomé

Author: Candice Salomé, Health Writer

Candice is a content creator at Carenity and specialzes in writing health articles. She has a particular interest in the fields of women's health, well-being and sports. 

Candice holds a master's degree in... >> Learn more

1 comment

on 4/16/22

I must mention that fermented foods are a known trigger of Carcinoid Syndrome symptoms in people with functional Neuroendocrine Tumors.

People living with this condition must avoid fermented foods.

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