According to Gram Research analysis of a 2026 randomized controlled trial with 148 participants, weight loss and reducing ultra-processed foods—not the specific diet type—are the main drivers of liver fat improvement in people with fatty liver disease. All three diet approaches tested (Mediterranean, low-carb, and standard nutrition advice) produced similar liver improvements, with weight loss and ultra-processed food reduction independently predicting better outcomes.
A new study of 148 people with fatty liver disease found that losing weight and eating fewer ultra-processed foods improved liver health more than following a specific diet plan. Researchers compared three different eating approaches—Mediterranean diet, low-carb high-protein diet, and standard nutrition advice—over six months. All three groups saw similar improvements in liver fat, weight, and overall health. The key takeaway: it’s not about which diet you choose, but rather losing weight and cutting out processed foods that really matters for liver health.
Key Statistics
A 2026 randomized controlled trial of 148 adults with fatty liver disease found that all three diet approaches—Mediterranean, low-carb high-protein, and standard nutrition advice—produced similar reductions in liver fat over six months, with no significant differences between groups.
In a study of 148 people with metabolic dysfunction-associated fatty liver disease, weight loss and reduction in ultra-processed food intake independently predicted improvements in liver fat, while the specific diet type did not directly affect outcomes.
A 2026 trial published in JHEP Reports showed that 85.5% of 173 enrolled participants with fatty liver disease completed a six-month dietary intervention, with all three diet groups achieving significant improvements in body weight, BMI, and metabolic health markers.
Research from a 2026 randomized controlled trial demonstrated that ultra-processed food reduction and BMI reduction were the primary factors associated with liver fat improvements in MASLD, supporting a flexible, patient-centered dietary approach over prescriptive diet types.
The Quick Take
- What they studied: Whether specific diet types (Mediterranean, low-carb, or standard nutrition advice) help people with fatty liver disease, and what actually drives improvements in liver health.
- Who participated: 148 adults with metabolic dysfunction-associated fatty liver disease who were overweight or obese and had never received formal nutrition counseling. Participants were randomly assigned to one of three diet groups and followed for six months.
- Key finding: All three diet groups improved their liver fat content by similar amounts. Weight loss and reducing ultra-processed foods were the main factors that improved liver health, not the specific diet type chosen.
- What it means for you: If you have fatty liver disease, focus on losing weight and eating fewer processed foods rather than stressing about which diet to follow. Any reasonable eating plan that helps you lose weight and cut processed foods can work. This gives you more flexibility to choose an approach you can stick with long-term.
The Research Details
This was a randomized controlled trial, which is one of the strongest types of research studies. Researchers enrolled 173 people with fatty liver disease and randomly divided them into three groups. One group followed a Mediterranean diet (lots of vegetables, fish, and olive oil), another followed a low-carb, high-protein diet, and the third group received standard nutrition recommendations. All participants were tracked for six months, with their liver fat measured using a special ultrasound technique called controlled attenuation parameter (CAP). Researchers also measured weight, body composition, blood sugar control, and how much ultra-processed food each person ate.
The study was designed to answer an important question: does the specific type of diet matter, or is weight loss itself the main driver of improvement? To answer this, researchers used advanced statistical analysis called structural equation modeling to trace which factors actually caused the improvements in liver fat. This approach allowed them to separate the effects of diet type from the effects of weight loss and food quality changes.
This research approach is important because many people believe that following a specific diet plan is the key to health improvement. By comparing three different diets and measuring what actually changed, the researchers could identify whether the diet type itself mattered or whether other factors (like weight loss) were more important. This helps doctors and patients focus their efforts on what truly works rather than wasting time debating which diet is ‘best.’
This study has several strengths: it was a randomized controlled trial (the gold standard for research), 85.5% of participants completed the full six months (good completion rate), and researchers used objective measurements of liver fat rather than relying on self-reporting. The study was published in a peer-reviewed medical journal. However, the study lasted only six months, so we don’t know if these benefits continue longer. The sample size of 148 is moderate—larger studies might reveal differences between diet types that this study missed.
What the Results Show
All three diet groups showed significant improvements in liver fat content over the six months. The low-carb, high-protein group saw liver fat decrease by an average of 19.5 units, and the standard nutrition group saw a decrease of 11.0 units. The Mediterranean diet group also improved, though the improvement was not statistically significant on its own. Importantly, there were no meaningful differences between the three groups—all three approaches worked about equally well.
When researchers analyzed what actually caused these improvements, they found something surprising: the specific diet type didn’t directly improve liver fat. Instead, two factors predicted improvement: losing weight (measured by BMI reduction) and eating fewer ultra-processed foods. These two factors independently and significantly predicted better liver health outcomes. In other words, whether someone followed a Mediterranean diet, a low-carb diet, or standard advice didn’t matter as much as whether they lost weight and cut out processed foods.
All three groups also improved in other important ways: they lost weight, reduced body fat, improved their blood sugar control and cholesterol levels, and improved their overall diet quality. The reduction in ultra-processed food consumption was consistent across all groups, suggesting that all three dietary approaches helped people eat better-quality foods.
Beyond liver fat, the study measured several other health markers. Body weight decreased in all groups, with participants losing meaningful amounts of weight. Body mass index (BMI) improved across all three groups. Measures of body fat and muscle composition improved. Blood sugar control and cholesterol profiles improved in all groups. These metabolic improvements happened regardless of which diet people followed, further supporting the idea that weight loss itself—not diet type—drives health improvements.
This study challenges a common assumption in nutrition science: that specific diet patterns (like Mediterranean or low-carb diets) have unique benefits beyond weight loss. Previous research has often promoted particular diets as superior, but this trial suggests that the benefits attributed to these diets may actually come from weight loss and improved food quality rather than the diet’s specific composition. The findings align with growing evidence that dietary adherence and sustainability matter more than diet type, and that a ‘best diet’ is really the one a person can stick with long-term.
The study lasted only six months, so we don’t know if these results continue over years. The sample size of 148 is moderate—larger studies might detect differences between diet types that this study missed. The study included only people with fatty liver disease who were overweight or obese; results might differ for people at normal weight or with other health conditions. The study measured liver fat using ultrasound, which is reliable but less precise than some other methods. Finally, the study didn’t track what people ate after the six months ended, so we don’t know if the improvements lasted.
The Bottom Line
If you have fatty liver disease, focus on losing weight and reducing ultra-processed foods rather than worrying about which specific diet to follow. Choose an eating approach you can sustain long-term—whether that’s Mediterranean, low-carb, or another reasonable plan. The evidence strongly supports that weight loss and food quality improvements drive liver health benefits. Work with a healthcare provider or registered dietitian to create a personalized plan that fits your preferences and lifestyle. (Confidence level: Strong evidence from a well-designed randomized controlled trial)
This research is most relevant for people with metabolic dysfunction-associated fatty liver disease (MASLD) who are overweight or obese. It’s also valuable for healthcare providers treating fatty liver disease, as it suggests a more flexible approach than prescribing specific diet types. People without fatty liver disease may still benefit from the general principle that weight loss and reducing ultra-processed foods improve metabolic health. People with other liver conditions should consult their doctor, as recommendations may differ.
Based on this study, meaningful improvements in liver fat occurred within six months of starting weight loss and reducing ultra-processed foods. However, the study didn’t track longer-term results. Realistic expectations: you might see improvements in blood work within weeks to months, but liver fat changes typically take several months to become apparent. Long-term success requires sustained lifestyle changes, not just short-term efforts.
Frequently Asked Questions
Is the Mediterranean diet better than low-carb for fatty liver disease?
A 2026 trial of 148 people with fatty liver disease found both diets worked equally well. Weight loss and reducing ultra-processed foods mattered more than diet type. Choose whichever approach you can stick with long-term for best results.
How much weight do I need to lose to improve my fatty liver?
The study showed meaningful liver fat improvements with weight loss over six months, though specific target amounts weren’t detailed. Aim for 5-10% body weight reduction as a realistic starting goal. Consult your doctor for personalized targets based on your health status.
What counts as ultra-processed food I should avoid?
Ultra-processed foods include packaged snacks, sugary drinks, fast food, processed meats, and ready-to-eat meals. Focus on eating whole foods like vegetables, fruits, fish, beans, and nuts. The 2026 study showed reducing these processed items significantly improved liver health.
How long does it take to see improvements in liver fat?
This study tracked changes over six months and found significant improvements by that point. You may notice improvements in energy and blood work within weeks, but liver fat changes typically require several months of consistent weight loss and dietary improvements.
Do I have to follow a specific diet plan for fatty liver disease?
No. A 2026 randomized trial showed that any reasonable eating approach producing weight loss and reducing ultra-processed foods improves fatty liver disease. The flexibility to choose an approach you enjoy increases your chances of long-term success.
Want to Apply This Research?
- Track weekly weight changes and ultra-processed food intake (count servings per day or percentage of meals). These two metrics directly predict liver fat improvement according to this research. Set a goal to reduce ultra-processed foods by 25-50% and lose 5-10% of body weight over six months.
- Use the app to log meals and identify ultra-processed foods to reduce (packaged snacks, sugary drinks, fast food, processed meats). Rather than switching to a specific diet type, focus on swapping processed foods for whole foods you enjoy. Track weight weekly and celebrate non-scale victories like improved energy and better blood work.
- Set up monthly check-ins to review weight trends and ultra-processed food reduction progress. Create alerts for when you hit weight loss milestones (5%, 10% of starting weight). Track metabolic markers (blood sugar, cholesterol) if available through your healthcare provider, and correlate improvements with your app data on weight and food quality changes.
This article summarizes research findings and should not replace professional medical advice. If you have fatty liver disease or are considering dietary changes, consult your healthcare provider or registered dietitian before starting any new eating plan. This is especially important if you take medications or have other health conditions. The study lasted six months, so long-term effects are unknown. Individual results may vary based on your specific health situation, genetics, and ability to maintain lifestyle changes.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.