Can a Mediterranean-Style Diet Improve Liver Health?
Summary ID06-ND-RS-00080
Research Summary
Original Publication
Can a Mediterranean-Style Diet Improve Liver Health?
Journal
BMC Medicine, .
- Category
- 06Nutrition & Diet
- Evidence
- Systematic Review and Meta-Analysis of Randomized Controlled Trials
- Summary Type
- Latest
What Was Studied?
Fat accumulation in the liver is increasingly common, particularly among people with excess abdominal fat, insulin resistance and type 2 diabetes.
The condition is now known as metabolic dysfunction-associated steatotic liver disease (MASLD), previously called non-alcoholic fatty liver disease.
Although early stages may cause no symptoms, the disease can progress to liver inflammation, fibrosis and, in some patients, cirrhosis.
Researchers examined whether a Mediterranean-style diet, regular exercise or a combination of both could improve liver health in adults with MASLD.
The systematic review included 37 randomized controlled trials. Eleven assessed Mediterranean dietary interventions, 27 assessed exercise, and two examined combined diet and exercise interventions. Some trials contributed to more than one category.
The researchers evaluated body weight, waist circumference, liver enzymes, liver fat and indicators of liver fibrosis.
Key Findings
A Mediterranean-style diet improved several markers of liver health
Compared with control diets or usual care, Mediterranean dietary interventions produced modest but statistically significant improvements in body weight and liver enzymes.
On average, participants lost approximately 2.4 kg more than those in comparison groups.
Levels of alanine aminotransferase (ALT), an enzyme that can indicate liver injury, also decreased.
However, improvements were not consistent across all liver enzymes.
The findings suggest that a Mediterranean-style diet can support liver health, although the size of the benefit varies.
Some studies found reductions in liver fat
Several randomized trials reported improvements in liver fat after Mediterranean dietary interventions.
Some used magnetic resonance imaging, while others relied on indirect indicators of fatty liver.
However, not every study found a significant improvement compared with its control group.
The overall evidence therefore supports potential benefits for liver fat, but results depend on the intervention and how liver health is measured.
Weight reduction is an important part of treatment
Excess body fat, particularly around the abdomen, is closely linked to metabolic liver disease.
Weight loss can reduce the amount of fat stored in the liver and improve metabolic function.
European clinical guidelines recommend sustained weight reduction for people with MASLD who are overweight.
They identify approximate targets of:
* 5% body-weight reduction to improve liver fat. * 7–10% reduction to improve liver inflammation. * At least 10% reduction to improve liver fibrosis.
These are guideline-based treatment targets, not thresholds established by the present meta-analysis.
Exercise provides additional benefits
The review also examined aerobic exercise, resistance training and combinations of both.
Aerobic exercise was associated with modest weight reduction. Resistance training showed improvements in some liver enzyme measurements.
Regular physical activity can also improve insulin sensitivity and cardiometabolic health.
The findings support exercise as an important part of MASLD management, although the evidence did not establish one universally superior exercise programme.
Diet quality matters beyond weight loss
A Mediterranean-style dietary pattern emphasizes vegetables, fruit, legumes, whole grains, nuts, olive oil and fish.
It generally limits refined carbohydrates, sugary drinks, processed meats and foods rich in saturated fat.
European guidelines recommend improving overall diet quality, even when weight loss is not the only goal.
Some evidence suggests that dietary improvements may benefit liver health independently of major weight changes.
However, the size and consistency of weight-independent benefits remain uncertain.
Long-term liver outcomes remain less certain
The review found encouraging improvements in weight, liver enzymes and some measures of liver fat.
Nevertheless, relatively few studies provided strong evidence concerning long-term fibrosis progression or major clinical outcomes.
Changes in liver enzymes or imaging measurements do not necessarily mean that cirrhosis or liver-related mortality will be prevented.
Larger, longer studies are needed to establish these outcomes.
Why It Matters for Longevity
Liver health is closely connected with metabolic health and cardiovascular risk.
A Mediterranean-style diet offers a practical approach without requiring restrictive diets, special supplements or so-called liver detox products.
Choosing more vegetables, legumes, whole grains, olive oil, nuts and fish while reducing sugary drinks and highly processed foods can improve overall dietary quality.
For people with excess weight and MASLD, combining these changes with regular exercise and sustainable weight reduction is particularly important.
The objective is not simply to improve a liver enzyme result, but to support long-term metabolic and cardiovascular health.
Clinical Perspective
This meta-analysis supports Mediterranean-style eating and physical activity as practical components of MASLD management.
The evidence is strongest for improvements in body weight and selected metabolic and liver markers. Findings for liver fat and fibrosis are less consistent.
The included trials varied in duration, dietary interventions, exercise programmes and outcome measurements. These differences limit direct comparisons.
The results are consistent with European EASL–EASD–EASO guidelines, which recommend Mediterranean-style dietary improvements, reduced consumption of ultra-processed foods and avoidance of sugar-sweetened beverages.
Importantly, MASLD requires appropriate clinical assessment. Dietary changes do not replace evaluation for significant liver fibrosis or other causes of liver disease.
Key Takeaway
A Mediterranean-style diet, particularly when combined with physical activity and sustainable weight management, can improve several markers of liver health in people with metabolic fatty liver disease. Evidence for preventing long-term liver complications is less certain, but these lifestyle changes remain central to current clinical recommendations.
Reviewed and Summarized by
Source Publication
- Title:
- Can a Mediterranean-Style Diet Improve Liver Health?
- Authors:
- Artola Arita V, et al.
- Journal:
- BMC Medicine, August 2025.
