Can fermented foods support liver health?

Fermented foods are widely known for supporting gut health – improving digestion, enhancing nutrient absorption, and helping maintain a balanced microbiome. But could these foods also play a role in supporting your liver health?

Emerging research suggests the answer may be yes. Thanks to the powerful connection between the gut and the liver – known as the gut–liver axis – what benefits your gut may also positively influence your liver.

Let’s explore how fermented foods fit into this important relationship.

Understanding the gut-liver axis

The gut–liver axis describes the close relationship between the gastrointestinal system, particularly the gut microbiome, and the liver. These two organs constantly communicate through the portal vein, which carries nutrients, metabolites, and microbial products from the digestive system directly to the liver.

Because of this connection, the health of your gut microbiome can influence digestion, metabolism, immune function, and the development of liver diseases.¹

When the gut microbiome is balanced, this communication works smoothly. But when the microbiome is disrupted, harmful compounds may reach the liver, contributing to inflammation or metabolic stress.

What are fermented foods?

Fermented foods are produced through a natural process where beneficial bacteria or yeast break down sugars and starches in food. This process not only preserves the food but also produces probiotics, beneficial microorganisms that can support gut health.

Common fermented foods include:

Kefir
Yoghurt
Sauerkraut
Kimchi
Sourdough bread

Foods or drinks that have been fermented tend to have a tangy flavour, and can be fizzy – something you may notice in traditionally fermented kefir.

Over the past few years, fermented foods have become increasingly popular as interest in gut health and the microbiome has grown. Research continues to explore their potential health benefits across multiple areas of wellbeing.²

Choosing high-quality fermented foods

Not all fermented foods offer the same benefits.

Some supermarket products labelled as fermented – including certain kefir drinks – may contain:

Added sugars
Artificial sweeteners
Preservatives or additives
A limited range of beneficial bacteria

These products may not provide the same probiotic diversity or potency as foods fermented traditionally using live cultures or kefir grains.

When choosing fermented foods, it’s worth checking ingredient lists and looking for products that contain live cultures and no-to-minimal additives.

What does the liver do?

The liver is one of the body’s most important organs and performs over 500 essential functions.

Several of these functions directly relate to digestion and gut health.

For example, the liver:³

Produces bile, which helps break down fats during digestion
Stores vitamins and minerals absorbed through the gut
Metabolises carbohydrates, proteins, and fats so the body can use them efficiently

Because the liver receives substances absorbed from the gut, maintaining a healthy gut environment may reduce the burden placed on the liver.

How fermented foods support liver health

Fermented foods contain probiotics that help support a healthy gut microbiome. Improving your gut health reduces inflammation and improves digestion, influencing the gut-liver axis and keeping your liver happy and healthy.

Some research suggests that probiotics may even play a potential role in reducing risk factors linked to conditions such as non-alcoholic fatty liver disease (NAFLD).⁴

While fermented foods are not a treatment for liver disease, regularly including them in a balanced diet may contribute to overall gut and metabolic health by promoting a healthy microbiome, reducing inflammation, and supporting the liver through the gut–liver axis.

New to fermented foods?

If you’re just starting your fermentation journey, small changes can make a big difference. Adding foods like kefir, sauerkraut, or fermented vegetables to your daily diet is a simple, natural way to begin supporting your gut microbiome.

For a deeper introduction, take a look at our guide: A Beginner’s Guide to Fermented Foods

Any questions? Contact one of our Nutritional Therapists via live chat, weekdays from 8 am to 8 pm.

Can fermented foods support liver health?

Understanding the gut-liver axis

What are fermented foods?

Choosing high-quality fermented foods

What does the liver do?

How fermented foods support liver health

New to fermented foods?

References

Questions? Talk to a Nutritional Therapist on live chat!

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