Is Olive Oil Good for Fatty Liver? Evidence and How Much

TL;DR

• Olive oil is good for fatty liver when it replaces butter, lard and other solid fats. It anchors the Mediterranean-style diet that US and European liver guidelines recommend.
• Extra-virgin olive oil is the best type. Refined and “light” olive oils lose most of the polyphenols, but not the calories.
• It is still about 120 calories per tablespoon. Measure it, and use it instead of other fats, not on top of them.

Olive oil is good for fatty liver, especially extra-virgin olive oil used in place of butter and other saturated fats. It is the main fat in the Mediterranean diet, an eating pattern liver specialists often recommend for MASLD (formerly NAFLD).

That doesn’t make it a free pass. Olive oil is pure fat, and pouring it freely can add hundreds of calories a day. Since losing weight is the most reliable way to shrink liver fat, how much you use matters as much as which oil you choose.

Why do liver guidelines recommend a Mediterranean diet?

Both major liver guidelines point to it:

• The AASLD 2023 practice guidance says that, when possible, diets with limited carbohydrates and saturated fat, enriched with high fiber and unsaturated fats (e.g., a Mediterranean diet), should be encouraged, citing their additional cardiovascular benefits.
• The 2024 EASL–EASD–EASO guideline recommends improving diet quality toward a Mediterranean dietary pattern, limiting ultra-processed food, and avoiding sugar-sweetened beverages to improve liver injury. It lists olive oil among the minimally processed foods to build meals around.

The AASLD is candid that in small trials, the Mediterranean diet’s advantage over other approaches is debated. Different diets that cut calories tend to improve fatty liver similarly. But the Mediterranean diet is sustainable, and according to the AASLD, cardiovascular disease is one of the most common causes of death in people with fatty liver, so its heart benefits count.

One small but careful trial shows why the fat swap matters. In a 2013 study in the Journal of Hepatology, 12 people with biopsy-confirmed fatty liver ate a Mediterranean diet and a low-fat, high-carbohydrate diet for six weeks each. Liver fat fell by 39% on the Mediterranean diet versus 7% on the low-fat diet, even though weight loss didn’t differ between the two. Insulin sensitivity also improved on the Mediterranean diet.

What does research show about olive oil itself?

Studies that isolate olive oil are smaller and less consistent, and it’s worth being honest about that:

• Olive oil vs. sunflower oil: In a 12-week Iranian trial, 66 people with fatty liver were put on a 500-calorie-deficit diet and given 20 g a day (about 1.5 tablespoons) of either olive oil or sunflower oil. Fatty liver grade improved in both groups, but more with olive oil, and body fat and blood triglycerides fell in the olive oil group. Liver enzymes, on the other hand, improved more with sunflower oil.
• A PREDIMED substudy: Among 100 older Spanish adults at high heart risk, liver scans after three years found fatty liver in 8.8% of those on a Mediterranean diet with extra-virgin olive oil, versus 33% of those on a Mediterranean diet with nuts and 33% of those on a low-fat control diet. It is a small substudy, so treat it as a promising signal.
• A 2024 meta-analysis of 7 randomized trials (515 people with fatty liver) found no significant change in the liver enzymes ALT and AST with olive oil, though there was a small drop in body mass index.
• A 2025 review of 25 human studies concluded that extra-virgin olive oil helped most when paired with calorie reduction or a full Mediterranean pattern. It found extra-virgin oil outperformed refined olive oils, but noted that many studies were small and varied widely.

Part of the explanation is simple fat quality. In a Finnish overfeeding study, an extra 1,000 calories a day from saturated fat raised liver fat by 55% in three weeks, while the same extra calories from unsaturated fat raised it by 15%. Olive oil is about three-quarters monounsaturated fat. Butter is nearly two-thirds saturated.

Extra-virgin vs. refined olive oil: does it matter?

Yes. The grades differ in how they are made, and that changes the polyphenols they keep:

Label	How it’s made	Polyphenols	Best use
Extra-virgin	Mechanically extracted, no chemical refining; top grade for flavor and low acidity	Highest	Dressings, drizzling, everyday cooking
Virgin	Mechanically extracted; slightly lower flavor standard	Moderate	Cooking
”Olive oil” or “pure”	Mostly refined olive oil blended with some virgin oil	Low	Cooking when flavor doesn’t matter
”Light” or “extra light”	Refined oil; “light” means flavor and color, not calories	Very low	Baking, high-heat cooking
Olive-pomace oil	Solvent-extracted from leftover olive pulp, then refined	Very low	Not the one to choose

A review in the International Journal of Molecular Sciences notes that refined olive oil is devoid of the polyphenols and other minor compounds found in virgin oils. In the European Union, olive oil can only carry a health claim about protecting blood fats from oxidation if it contains at least 5 mg of these polyphenols per 20 g, a bar that only polyphenol-rich virgin oils reach.

Every grade has the same calories, about 120 per tablespoon, so pay for extra-virgin and use less.

How much olive oil should you use?

There is no official dose for fatty liver. The Iranian trial used 20 g a day (about 1.5 tablespoons), and the 2025 review found larger improvements at intakes above 30 to 50 g a day, usually as the main fat in a Mediterranean-style diet. For most people, 1 to 3 tablespoons a day, replacing other fats, is a practical range.

The calories are the catch. From USDA FoodData Central:

Per 1 tablespoon	Calories	Saturated fat	Monounsaturated fat
Olive oil (13.5 g)	119	1.9 g	9.8 g
Canola oil (14 g)	124	1.0 g	8.9 g
Butter (14.2 g)	102	7.3 g	3.0 g
Coconut oil (13.6 g)	121	11.2 g	0.9 g

So 3 tablespoons of olive oil is about 360 calories, as much as a small meal. The 2024 European guideline sets weight-loss targets of at least 5% of body weight to reduce liver fat, 7 to 10% to improve inflammation, and 10% or more to improve fibrosis. Our guide on how to reverse fatty liver has more on weight loss. If olive oil is added on top of your usual butter, cheese and dressings, the extra calories can cancel out the benefit.

How to use olive oil for a fatty liver

• Measure, don’t pour. Use a tablespoon or teaspoon for cooking. Free-pouring from the bottle makes portions hard to judge.
• Swap it in. Use it instead of butter on vegetables, in place of mayonnaise-based dressings, and instead of cream sauces on pasta or fish.
• Cook with it, and use some raw. Extra-virgin olive oil is fine for sautéing and roasting. In one lab study that heated oils to 180 and 220 °C, heat reduced some polyphenols, more at the higher temperature, but a significant share survived. A drizzle on finished food keeps the most.
• Build the plate around it. Olive oil works best with vegetables, beans, fish and whole grains, the rest of the Mediterranean pattern.
• Watch the bread basket. Dipping bread in oil adds up fast. Our bread and fatty liver guide explains what to choose.
• Use cheese as a garnish. A drizzle of good oil and herbs can stand in for some of the cheese; see is cheese bad for fatty liver.

Nuts and seeds are another unsaturated-fat option. Our peanut butter guide covers portions. An app like Liverly can log your oil by the tablespoon and show how it shifts a meal’s calories and saturated fat.

The Bottom Line

Olive oil is good for fatty liver, and extra-virgin olive oil is the best choice. It is the backbone of the Mediterranean-style diet that US and European liver guidelines recommend, and in small studies, diets built around it lowered liver fat. Most of the benefit comes from what olive oil replaces, such as butter, lard and fatty meats, and from the pattern it belongs to.

Keep the portion in view: about 120 calories per tablespoon, with 1 to 3 tablespoons a day as a practical range for most people. Swap it for saturated fats, measure it, and pair it with vegetables, legumes and fish. For how it fits into the rest of your eating, see the fatty liver diet guide.

Sources

• Rinella ME, et al. AASLD Practice Guidance on the clinical assessment and management of nonalcoholic fatty liver disease. Hepatology. 2023.
• EASL–EASD–EASO Clinical Practice Guidelines on the management of MASLD: Executive Summary. 2024.
• Ryan MC, et al. The Mediterranean diet improves hepatic steatosis and insulin sensitivity in individuals with non-alcoholic fatty liver disease. J Hepatol. 2013.
• Rezaei S, et al. Olive oil lessened fatty liver severity independent of cardiometabolic correction in patients with non-alcoholic fatty liver disease: A randomized clinical trial. Nutrition. 2019.
• USDA FoodData Central: Oil, olive, salad or cooking (FDC ID 171413).

This article is for informational purposes only and is not medical advice. Talk to your doctor or hepatologist about your specific situation.