Sustained diet changes and a daily walk of about 5 kilometers, or roughly 3 miles, led to measurable liver scar reversal in 40.5% of people with fatty liver disease, according to a retrospective real-world study published in 2025 in the Journal of Clinical and Experimental Hepatology.
The finding matters because many patients assume liver scarring, known as fibrosis, can only be tackled with medication.
This study, which analyzed 565 patients who stuck with the changes for a year, suggests that basic lifestyle steps alone can move the needle on the disease.
What the researchers actually did
The team retrospectively included 776 adults with nonalcoholic fatty liver disease, now commonly called MASLD (metabolic dysfunction-associated steatotic liver disease), and analyzed 565 patients who followed the plan for a full year. The intervention was straightforward. Patients cut calories and walked about 5 kilometers a day.
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Weight came down in 85.2% of patients, with average body mass index falling from 26.08 to 25.06 kg/m². Liver stiffness, measured by a noninvasive scan called elastography, fell in 67.9% of patients, with the group average dropping from 7.21 to 6.61 kPa. A 2-point drop in stiffness was recorded in 52% of the group.
The headline number is fibrosis regression by one stage in 40.5% of patients. In plain terms, that means an actual reduction in the liver scar tissue that builds up as the disease progresses.
Why the size of the weight loss matters
The result lines up with what liver specialists already advise. The National Institute of Diabetes and Digestive and Kidney Diseases states that losing 3% to 5% of body weight can reduce fat in the liver, and that a 7% to 10% drop is often needed to reduce liver inflammation and fibrosis.
In the new study, BMI reduction correlated positively with the fall in liver stiffness (r = 0.43), meaning patients who lost more tended to see bigger stiffness reductions.
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Fatty liver disease is common in the United States. Recent estimates put the adult prevalence at roughly one in three. Left unchecked, it can progress through inflammation to fibrosis, cirrhosis and liver failure.
What the study can and cannot tell us
This was a retrospective real-world study, not a randomized trial. Patients were not assigned to different treatments and compared, and there was no control group.
That means the study cannot prove the diet and walking caused every improvement, only that the two together tracked closely with better liver measures over a year.
The improvements also apply to early-to-moderate scarring. The study did not examine whether the same routine reverses advanced cirrhosis, and current guidance still separates late-stage disease from the earlier phases where lifestyle changes have their strongest track record.
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The authors noted that despite the growing focus on new drug treatments for MASLD, plain lifestyle change kept producing regression when patients stayed with it.
Rapid weight loss is not the goal. The NIDDK warns that dropping weight too quickly can worsen liver disease.
Anyone with a fatty liver diagnosis, or symptoms such as persistent fatigue or upper-right abdominal discomfort, should discuss any exercise and diet plan with their doctor before starting, especially if they take medication for diabetes or blood pressure.
For patients who already have a diagnosis and want a concrete next step, the study points to a target the average person can measure.
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About 5 kilometers of walking a day, paired with steady dietary cutbacks aimed at losing 5% to 10% of body weight over the coming year.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.