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Quick answer: Fatty liver disease, now called metabolic dysfunction-associated steatotic liver disease (MASLD), affects roughly a third to over 40% of US adults depending on the study. It usually causes no symptoms, so it is often found by accident. The encouraging news: in most people it responds to lifestyle change. Losing about 3 to 5% of body weight reduces liver fat, and 7 to 10% improves most liver changes, including scarring in many cases. The key step after 50 is finding out whether you have scarring (fibrosis), which a simple blood-based score can screen for.
What fatty liver actually is
The liver normally holds a small amount of fat. When fat makes up more than about 5% of the liver’s weight in someone who drinks little or no alcohol and has metabolic risk factors, it is called MASLD. The name changed in 2023 from “NAFLD” to reflect the link with metabolic problems such as excess belly fat, high blood sugar, high blood pressure and abnormal cholesterol.
Most people have simple fat in the liver, which is relatively benign. In a minority, the fat triggers inflammation and injury, a form called MASH (previously NASH). Over years, MASH can cause scarring and, in some people, cirrhosis. That is why the stage of scarring matters more than the fat itself.
How common is it?
Estimates depend on how it is measured. One national analysis of 2017 to 2018 data put adjusted prevalence around 42%, while a later analysis using liver stiffness scans found it fell from about 37.6% to 32.5% between 2017 to 2020 and 2021 to 2023. Either way, it is among the most common chronic liver conditions in the United States. It also appears in people who are not overweight: in one national analysis, around 6% of lean adults had MASLD and about a third of them were undiagnosed.
Why it matters more after 50
Risk climbs with age, belly fat, prediabetes and type 2 diabetes, and the risk of advanced scarring tends to rise over time. Menopause may also shift fat toward the abdomen. Fatty liver is tied to heart disease too; many people with MASLD are more likely to die from cardiovascular events than from liver problems, so it works as a warning light for overall metabolic health. See our guides on prediabetes, cholesterol numbers and blood pressure.
Symptoms: usually none
Early fatty liver rarely causes symptoms. Some people feel fatigue or mild discomfort in the upper right abdomen. Yellow skin or eyes, swelling in the legs or belly, easy bruising, or confusion point to advanced disease and need prompt medical attention. Because symptoms are absent, discovery typically comes through routine blood tests showing raised liver enzymes (ALT, AST) or an ultrasound done for another reason. Normal enzymes do not rule it out.
How doctors check for scarring
The most useful question is whether the liver has significant fibrosis. A common first step is the FIB-4 score, calculated from your age, platelet count and two liver enzymes. A score under about 1.3 suggests a low chance of advanced fibrosis, and a person can usually be followed in primary care. Higher scores call for a second test, such as a specialized blood test or an ultrasound-based stiffness scan (elastography). Guidance in Europe uses a higher cutoff of about 2.0 for people over 65, and FIB-4 can be less accurate in people with diabetes or obesity, so your clinician may choose to scan you anyway. A liver biopsy is now needed only in selected cases.
If you are over 50 and have type 2 diabetes, prediabetes, obesity or metabolic syndrome, it is reasonable to ask: “Should I have my liver fibrosis risk checked?”
What actually works: lifestyle first
Weight loss, in realistic steps
Weight loss is the best-studied treatment. According to AASLD guidance as summarized in recent reviews, losing 3 to 5% of body weight improves liver fat and 7 to 10% improves most features of the disease, including inflammation and, in many people, fibrosis. For a 200-pound person, that is roughly 14 to 20 pounds. Gradual loss is safer than crash diets; very rapid weight loss can sometimes worsen liver inflammation. If weight loss feels impossible, read why it is so hard to lose weight after 50.
Food pattern
A Mediterranean-style pattern, rich in vegetables, legumes, whole grains, fish and olive oil, with less sugary drinks, refined carbohydrates and ultra-processed food, is the most commonly recommended approach. Cutting sugar-sweetened beverages is one of the simplest changes. You do not need a special “liver cleanse” or detox product; these are not supported by evidence.
Exercise
Both aerobic exercise and resistance training reduce liver fat, even with little weight loss. Aim for about 150 minutes of moderate activity a week plus two strength sessions. Preserving muscle matters, especially when losing weight; see GLP-1 medications and muscle loss.
Alcohol
Alcohol adds to liver injury. Many specialists advise limiting it strongly or avoiding it when you have fatty liver with scarring. Ask your clinician what is safe for you.
Medical treatment: newer options
In March 2024 the FDA approved resmetirom, the first drug for MASH with moderate to advanced fibrosis in adults without cirrhosis. Some GLP-1 medicines have also been studied for liver benefit, and the 2026 European guidance discusses both resmetirom and semaglutide for MASH. These are for people with confirmed MASH and meaningful fibrosis, and are prescribed by a doctor after testing. They do not replace lifestyle change. Managing blood sugar, blood pressure and cholesterol also lowers overall risk.
Supplements: be cautious
Many products claim to “support liver health.” The evidence is weak for most, and some supplements, including high-dose herbal products, can actually injure the liver. Tell your clinician about everything you take. If you want to learn more, our look at beef liver supplements shows how to separate claims from evidence. Vitamin E has been studied in non-diabetic people with MASH, but it is not for everyone, so it should be a medical decision.
Tracking your progress
Home tools can help you act on the basics. A reliable digital bathroom scale lets you track weight trends, and a tape measure for waist circumference is free. Weigh in weekly rather than daily, and focus on the direction over months. Your doctor can repeat blood tests and, when appropriate, a scan to see how your liver is responding.
When to see a doctor
- Your blood tests show elevated liver enzymes, or an imaging report mentions “fatty liver” or “steatosis”
- You have diabetes, prediabetes, obesity or metabolic syndrome and have never had your liver assessed
- You notice yellowing of the skin or eyes, belly swelling, dark urine or pale stools
- You vomit blood or pass black stools, which needs emergency care
The bottom line
Fatty liver is common, silent and usually reversible when caught early. Ask about a fibrosis check if you are at risk, aim for steady weight loss of 5 to 10%, improve food quality, move more, and limit alcohol. This article is general information and not a substitute for medical advice.
Sources: AASLD guidance on MASLD and MASH (2023 and 2024 updates, as summarized in published reviews); NHANES prevalence analyses; FDA approval of resmetirom, March 2024; EASL-EASD-EASO clinical practice guidelines.
Frequently asked questions
Is fatty liver reversible?
In many people, yes, especially before significant scarring develops. Losing 7 to 10% of body weight, eating a Mediterranean-style diet, exercising and limiting alcohol can reduce liver fat and inflammation.
What is the difference between NAFLD and MASLD?
MASLD is the 2023 name that replaced NAFLD. It requires fat in the liver plus at least one metabolic risk factor, such as excess weight, high blood sugar, high blood pressure or abnormal cholesterol.
Can you have fatty liver and normal liver enzymes?
Yes. Many people with fatty liver have normal ALT and AST, so normal blood tests do not rule it out. Imaging or a fibrosis score may be needed.
What is a FIB-4 score?
FIB-4 is a calculation from age, platelet count and the liver enzymes AST and ALT that estimates the chance of advanced liver scarring. A score under about 1.3 suggests low risk, while higher values call for further testing. It can be less reliable in older adults and in people with diabetes or obesity.
Is there a medication for fatty liver?
In March 2024 the FDA approved resmetirom for MASH with moderate to advanced fibrosis in adults without cirrhosis. Treatment depends on confirmed disease, so it is a decision for your doctor. Lifestyle change remains the foundation.