NASH (nonalcoholic steatohepatitis) can be reversed, and for most people the primary tool is weight loss. Losing at least 10% of your body weight resolves NASH in about 90% of cases and reverses liver scarring in nearly half. Even at earlier stages of weight loss, meaningful improvements begin. The process takes sustained effort over months, but the liver is remarkably good at healing itself when the conditions that damaged it are removed.
How Much Weight Loss It Takes
Weight loss is the single most effective intervention for reversing NASH, and the benefits scale with how much you lose. A landmark study published in Gastroenterology found clear thresholds. Losing at least 5% of body weight resolved NASH in 58% of patients and reduced disease severity scores in 82%. Losing 7% to 10% improved scores across the board. But the real target is 10% or more: at that level, 90% of patients had complete resolution of NASH, and 45% saw their liver scarring actually regress.
That 10% figure is important to keep in mind. For someone weighing 220 pounds, it means losing 22 pounds and keeping it off. That’s ambitious but achievable. The method of weight loss matters less than the result. Clinical trials have shown that weight loss through lifestyle changes, medication, or bariatric surgery all reverse the disease, as long as the metabolic improvements are sustained.
Why Diet Matters Beyond Calories
Cutting calories drives weight loss, but the composition of your diet independently affects your liver. A Mediterranean-style eating pattern, rich in olive oil, nuts, fish, vegetables, and whole grains, reduced liver fat by 39% in one trial, compared to just 7% on a standard low-fat, high-carbohydrate diet. The Mediterranean diet also improved insulin sensitivity, while the low-fat diet did not. These benefits held even in participants who didn’t lose weight, which suggests the type of food you eat directly influences liver healing.
The Mediterranean diet works partly because it’s naturally low in refined carbohydrates and sugar while being high in monounsaturated fats and omega-3 fatty acids. Both of these fat types have been shown to reduce liver fat accumulation.
Fructose Deserves Special Attention
Fructose is processed almost entirely by the liver, and unlike glucose, it bypasses the normal rate-limiting step that prevents your body from converting excess sugar into fat. When fructose intake exceeds what the small intestine can handle (roughly 25 grams is the upper limit for a healthy adult), the overflow hits the liver directly and triggers fat production. The intestine’s ability to process fructose saturates at surprisingly low levels, around 5 grams per sitting.
This makes sugary drinks, fruit juices, and foods with added sugars particularly harmful for someone with NASH. A single can of soda contains about 40 grams of sugar, roughly half of which is fructose. That overwhelms intestinal processing and drives fat buildup in the liver, worsens insulin resistance, and promotes the inflammation that defines NASH. Cutting out added sugars, especially liquid fructose, is one of the highest-impact dietary changes you can make.
Exercise Reduces Liver Fat Directly
Exercise helps reverse NASH both by contributing to weight loss and by reducing liver fat independently. Both aerobic exercise and resistance training are effective, and the required commitment is similar for each. Systematic reviews of clinical trials found that the typical effective aerobic protocol was 40-minute sessions, three times per week, at moderate intensity (brisk walking, cycling, or swimming). Resistance training worked with 45-minute sessions at the same frequency. Both approaches showed measurable reductions in liver fat within 12 weeks.
You don’t need to choose one over the other. A combination of both is reasonable, and the best exercise is whatever you’ll actually do consistently. The key takeaway is that you don’t need extreme workouts. Moderate, regular activity sustained over months is what produces results.
How Insulin Resistance Drives the Disease
Insulin resistance is almost universal in people with NASH and is central to why the disease progresses. When your cells respond poorly to insulin, your body compensates by producing more of it. High insulin levels promote fat storage in the liver, increase visceral fat, worsen blood lipid profiles, and fuel the chronic inflammation that turns simple fatty liver into NASH.
This is why reversing insulin resistance is the metabolic core of NASH treatment. Weight loss is the most direct way to do it. Losing weight improves how your cells respond to insulin, reduces liver fat, shrinks visceral fat, lowers blood sugar, and calms systemic inflammation. These improvements reinforce each other. For people with type 2 diabetes, controlling blood sugar through weight loss and medication provides additional liver benefits. Newer weight-loss medications (GLP-1 receptor agonists like semaglutide and liraglutide) have been shown to help patients reach that critical 10% weight loss threshold more reliably than lifestyle changes alone, which makes them a practical option for people who struggle with diet and exercise alone.
The First FDA-Approved Medication
In 2024, the FDA approved Rezdiffra (resmetirom) as the first medication specifically for NASH with moderate to advanced liver scarring. It works by activating a thyroid hormone receptor in the liver that helps clear excess fat. In clinical trials, 24% to 36% of patients on the higher dose achieved NASH resolution without worsening of scarring, compared to 9% to 13% on placebo. Scarring improvement occurred in 24% to 28% of treated patients versus 13% to 15% on placebo.
These numbers are meaningful but modest. Rezdiffra is approved as an add-on to diet and exercise, not a replacement for them. It’s intended for people with significant fibrosis (stages F2 and F3) who haven’t yet progressed to cirrhosis. For most people with NASH, lifestyle changes remain the foundation, and medication is a tool to boost results.
Can Liver Scarring Actually Heal?
Yes. Studies confirm that about half of patients who improve their metabolic profile see fibrosis regress to the point where the liver functions completely normally. This is true even for advanced fibrosis. The liver has a strong regenerative capacity, and removing the source of ongoing damage (excess fat, inflammation, insulin resistance) allows scar tissue to gradually remodel.
The important exception is cirrhosis, the most advanced stage of scarring. People who have already developed cirrhosis can still improve their liver function and quality of life through the same interventions, but they remain at elevated risk for liver cancer even after other features of NASH have resolved. This makes early action critical. The earlier you intervene, the more completely the liver can heal.
Tracking Your Progress
A FibroScan is the most common noninvasive way to monitor NASH over time. It measures two things: liver stiffness (a proxy for scarring) and a CAP score (a measure of fat content).
For liver fat, a CAP score below 238 dB/m is considered normal. Scores of 238 to 260 indicate mild fatty change affecting less than a third of the liver. Scores of 260 to 290 indicate moderate fat (one-third to two-thirds of the liver), and scores above 290 indicate severe fat affecting more than two-thirds. As you lose weight and change your diet, you should see your CAP score drop.
For scarring, normal liver stiffness falls between 2 and 7 kPa. Higher numbers indicate more fibrosis. Moderate and severe fibrosis, the stages where most NASH patients are diagnosed, are explicitly considered reversible with treatment. Your doctor will likely repeat FibroScan measurements every 6 to 12 months to track whether your interventions are working. Some patients have shown fibrosis improvement on biopsy in as little as 12 weeks of consistent aerobic exercise, though most people should expect meaningful changes to develop over several months to a year of sustained effort.
Putting It All Together
Reversing NASH comes down to a clear set of priorities. Lose at least 10% of your body weight through whatever sustainable method works for you. Shift your eating pattern toward a Mediterranean-style diet rich in healthy fats, vegetables, and whole grains. Eliminate sugary drinks and minimize added sugars, especially fructose. Exercise moderately for 40 to 45 minutes at least three times a week. If you have type 2 diabetes or significant insulin resistance, work with your doctor on medications that address those conditions, since improving insulin sensitivity directly benefits your liver.
The liver is one of the few organs that can genuinely regenerate. NASH is not a one-way street. With consistent changes sustained over months, most people can stop the disease, reverse the damage, and return their liver to normal function.