The liver is one of the hardest-working organs in the body. It helps process nutrients, stores energy, removes waste products, and plays a major role in metabolism.
When too much fat builds up inside the liver, however, it can interfere with these important functions.
A condition called metabolic dysfunction-associated steatotic liver disease, or MASLD, has become increasingly common over the past few decades.
The disease is strongly linked to overweight and obesity and now affects millions of people worldwide. Researchers estimate that about 75 percent of people carrying excess weight have some degree of fatty liver disease.
In its early stages, fatty liver disease often causes few or no symptoms. Many people do not know they have it until blood tests or imaging scans reveal the problem. Unfortunately, if the disease continues to progress, it can lead to inflammation, liver scarring, cirrhosis, and even liver cancer.
Doctors generally recommend weight loss, exercise, and healthier eating habits as the first line of treatment. Although these strategies can be very effective, making and maintaining lifestyle changes can be difficult. Scientists are therefore searching for additional approaches that might help protect the liver.
A new study from the University of Jyväskylä and the University of Eastern Finland has identified a possible option. The study, published in npj Gut and Liver, examined whether a prebiotic fiber supplement called xylo-oligosaccharides, or XOS, could improve factors related to fatty liver disease.
Prebiotics are special types of fiber that cannot be digested by the human body. Instead, they pass into the large intestine and become food for beneficial bacteria. Researchers have become increasingly interested in prebiotics because the gut microbiota appears to influence many aspects of health, including metabolism, inflammation, and liver function.
Scientists now speak of the gut-liver axis, which describes the close communication between the digestive system and the liver. Substances produced by gut bacteria can travel through the bloodstream and affect liver health. Some compounds may be helpful, while others may contribute to disease.
The researchers recruited 42 overweight adults and asked them to consume 2.8 grams of XOS every day for four months. The amount of fat in the participants’ livers was measured using magnetic resonance imaging before and after the study.
The results showed that XOS reduced certain harmful metabolic byproducts in the gut. These compounds have previously been linked to increased liver fat accumulation. By reducing these substances, the fiber supplement may help restore healthier patterns of microbial activity inside the digestive system.
One of the most interesting findings was that the participants did not all respond in the same way. The supplement worked best in people whose gut bacteria were initially out of balance.
These individuals appeared to have excessive protein fermentation and reduced carbohydrate fermentation in the gut. After supplementation, their gut microbial balance improved, and they also experienced reductions in visceral fat around their organs.
By contrast, participants who showed blood markers suggesting more advanced fatty liver disease experienced little or no benefit. This finding raises the possibility that treatments based on gut health may need to be tailored to individual patients rather than applied in the same way to everyone.
The findings support growing evidence that the gut microbiota may play an important role in liver disease. They also suggest that relatively simple dietary interventions could one day become part of personalized treatment strategies.
However, it is important to interpret the results cautiously. This was a small study involving only 42 participants. Because it was the first human trial of XOS in fatty liver disease, many questions remain unanswered. Researchers still need to determine whether the benefits can be maintained over longer periods and whether different doses might produce larger effects.
Despite these limitations, the study is an important step forward because it moves findings from animal research into human testing. Its greatest strength is the demonstration that changes in the gut environment may influence liver health and that a person’s existing gut microbiota appears to determine how much benefit they receive from treatment.
Overall, the research offers promising early evidence that nourishing beneficial gut bacteria with a prebiotic fiber supplement may help improve liver health in certain people. Larger studies are now needed to confirm these findings and explore whether personalized gut-based therapies could become part of future treatment for fatty liver disease.
If you care about liver health, please read studies that refined fiber is link to liver cancer, and the best and worst foods for liver health.
For more health information, please see recent studies about how to boost your liver naturally, and simple ways to detox your liver.
Source: University of Jyväskylä and University of Eastern Finland.
