A new name for an old problem
In 2023 liver societies renamed non-alcoholic fatty liver disease (NAFLD) as metabolic dysfunction-associated steatotic liver disease, or MASLD. The new name points directly at the cause: a metabolic problem, and in most people that means insulin resistance. The condition is defined by excess fat in the liver plus at least one cardiometabolic risk factor such as a large waist, raised blood pressure, high triglycerides or abnormal glucose. Global estimates put its prevalence around 30 percent of adults.
How insulin resistance puts fat in the liver
- Fat tissue stops listening to insulin. Normally insulin tells fat cells to keep their fat. When they resist, they leak fatty acids into the blood, and the liver takes up a lot of them.
- The liver makes its own fat. High insulin switches on de novo lipogenesis, the pathway by which the liver converts sugar and starch into fat. Fructose, from sugary drinks in particular, is a strong trigger.
- The liver exports fat poorly. The extra fat accumulates faster than it can be packaged and shipped out.
- The liver becomes resistant itself. Fat inside liver cells blocks insulin signaling, so the liver keeps producing glucose, which links directly to type 2 diabetes.
Why it matters
Simple fat in the liver is often reversible. In some people it progresses to inflammation (MASH), scarring (fibrosis) and, in a minority, cirrhosis or liver cancer. The most common cause of death among people with MASLD is actually cardiovascular disease, which is another reason to think of it as a whole-body condition. See insulin resistance and heart disease.
Detecting it
There are usually no symptoms. Liver enzymes (ALT) can be normal even when there is significant fat. It is often found by accident on an ultrasound. If you have insulin resistance, type 2 diabetes, or a large waist, ask your doctor about a FIB-4 score, a simple calculation using age, AST, ALT and platelet count that estimates the risk of scarring. It can lead to a FibroScan or other tests if needed.
What helps the liver
Weight loss, when you carry extra. Studies show that losing 5 percent improves liver fat, 7 to 10 percent improves inflammation, and 10 percent or more can improve scarring in many people.
A Mediterranean-style pattern. The 2024 European guideline for MASLD recommends it, even without weight loss. That means vegetables, legumes, whole grains, olive oil, nuts and fish, and little ultra-processed food or red meat.
Cut liquid sugar. Sugar-sweetened drinks and fruit juice are one of the clearest dietary links to liver fat.
Coffee. Observational studies link regular coffee with less fibrosis. It is not a treatment, but unsweetened coffee is fine.
Limit alcohol. Alcohol adds to liver injury. Discuss what is safe for you.
Move. Exercise lowers liver fat even when the scale barely changes.
Liver-friendly meals
The sardine and white bean salad brings oily fish, olive oil and legumes together in ten minutes. The mushroom and barley risotto gives you intact grain and beta-glucan fiber in a satisfying dinner.
Sardine and White Bean Salad
Tinned fish and beans are the most underrated lunch in the Mediterranean pantry.
Mushroom and Pearl Barley Risotto
Pearl barley cooks up creamy and chewy, just like arborio rice, but carries far more fiber and a type of soluble fiber called beta-glucan that blunts the sugar spike.
For the numbers behind low-GI eating, read our guide to glycemic index and glycemic load.
Quick recipes for fatty liver
Every recipe below takes 30 minutes or less and is built around fiber, protein and slow carbohydrate. Browse the full recipe collection for more.
- Lemon Herb Cod with Tomatoes and White Beans (20 Minutes) (20 min): The Mediterranean eating pattern has the strongest evidence of any diet for reducing liver fat.
- Tuna Cucumber Avocado Salad with Lime (10 Minutes) (10 min): Tuna salad usually means mayonnaise.
- Lentil Parsley Walnut Tabbouleh (20 Minutes) (20 min): Traditional tabbouleh is mostly parsley with a little bulgur.
- Olive Oil Herb Omelette with White Beans (12 Minutes) (12 min): Eggs are a good protein source and are not a problem for most people with fatty liver when eaten in place of processed meat or sugary breakf
- Broccoli Garlic Chickpea Pasta (20 Minutes) (20 min): Chickpea pasta has roughly twice the protein and fiber of regular pasta and a smaller blood sugar effect.
- Sardine and White Bean Salad (10 min): Tinned fish and beans make the most underrated lunch in the Mediterranean pantry.
References
- Rinella ME, et al. A multisociety Delphi consensus statement on new fatty liver disease nomenclature. J Hepatol 2023;79:1542-1556.
- European Association for the Study of the Liver (EASL), EASD, EASO. Clinical practice guidelines on the management of metabolic dysfunction-associated steatotic liver disease (MASLD). J Hepatol 2024;81:492-542.
- Younossi ZM, et al. The global epidemiology of NAFLD and NASH in patients with type 2 diabetes. J Hepatol 2019;71:793-801; and Younossi ZM, et al. Hepatology 2023;77:1335-1347.
- Vilar-Gomez E, et al. Weight loss through lifestyle modification significantly reduces features of nonalcoholic steatohepatitis. Gastroenterology 2015;149:367-378.
Please note. This page is for education and is not medical advice. If you take insulin or medication that can cause low blood sugar, such as a sulfonylurea, talk to your care team before making large changes to what you eat. Read our medical disclaimer.