Coconut Oil and Fatty Liver: What the Evidence Shows

Coconut oil and fatty liver disease is a topic that generates considerable interest, particularly as coconut oil has been widely marketed as a health food. However, the evidence tells a more cautious story. Fatty liver disease, now more precisely termed metabolic dysfunction-associated steatotic liver disease (MASLD), is strongly influenced by diet, and the type of fat consumed matters significantly. This article examines what the current evidence says about coconut oil, how it compares with fats recommended by UK dietitians, and what dietary approach is most supported by NHS and NICE guidance for managing fatty liver disease.

What is fatty liver disease and how does diet affect it?

Fatty liver disease (MASLD) occurs when excess fat builds up in liver cells, and diet is one of the most significant modifiable factors. NICE guideline NG49 recommends dietary change and physical activity as the cornerstone of management.

Fatty liver disease occurs when excess fat accumulates in liver cells, and diet is one of the most significant modifiable factors influencing its progression or reversal. The condition is broadly divided into metabolic dysfunction-associated steatotic liver disease (MASLD, the current preferred term for what was previously called non-alcoholic fatty liver disease or NAFLD) and alcohol-related liver disease (ALD).^[1][2] MASLD is closely linked to obesity, type 2 diabetes, high triglycerides and insulin resistance, all of which are strongly shaped by dietary habits.

The liver processes dietary fats, carbohydrates and alcohol, and an excess of any of these can contribute to fat deposition within liver tissue. Diets high in refined carbohydrates, added sugars (particularly fructose), ultra-processed foods and certain types of fat have been associated with worsening liver fat accumulation, as described in NICE guideline NG49 and the EASL-EASD-EASO MASLD clinical practice guideline.^[2][3] Conversely, dietary patterns that reduce caloric excess, limit saturated fat and prioritise whole foods have been shown in clinical studies to reduce liver fat, including in some cases without substantial weight loss.

NICE guideline NG49, which covers the assessment and management of NAFLD (the terminology used in the guideline itself, now widely referred to as MASLD), emphasises lifestyle modification, including dietary change and increased physical activity, as the cornerstone of management. As of the date of this article, there is no licensed pharmacological treatment specifically indicated for MASLD in the UK, making dietary intervention particularly important.^[4] Readers should note that the licensing position may change and should check with their GP or pharmacist for the most current information.

In primary care, GPs typically use a scoring tool called FIB-4 (based on age, liver enzyme levels and platelet count) to estimate the risk of significant liver scarring (fibrosis).^[2] Depending on the result, further assessment with an enhanced liver fibrosis (ELF) blood test or transient elastography (FibroScan) may be arranged, and referral to a hepatologist considered if advanced fibrosis is suspected. Anyone with symptoms such as yellowing of the skin or eyes (jaundice), swelling of the abdomen, vomiting blood or passing black tarry stools, persistent confusion, or unexplained weight loss should seek urgent medical attention, as these may indicate serious liver complications.

Is coconut oil safe to eat if you have a fatty liver?

Coconut oil is not recommended for people with fatty liver disease, as it is 80 to 90 per cent saturated fat, which is associated with increased liver fat. No UK guideline body endorses coconut oil for liver health.

Coconut oil is not recommended as a beneficial fat for people with fatty liver disease, and current evidence suggests it may worsen liver fat accumulation when consumed in significant quantities. According to nutritional composition data (including McCance and Widdowson's composition of foods and USDA data), coconut oil is composed of approximately 80 to 90 per cent saturated fat, making it one of the most saturated dietary fats available.^[5] The predominant saturated fatty acids it contains include lauric acid, myristic acid and palmitic acid.^[5]

Saturated fat intake has been associated with increased hepatic (liver) fat in clinical studies, including overfeeding trials comparing high saturated fat diets with high polyunsaturated fat diets (for example, research by Rosqvist and colleagues).^[6][7] UK dietary guidance from the NHS and the Scientific Advisory Committee on Nutrition (SACN) advises limiting saturated fat and replacing it with unsaturated alternatives, a recommendation that applies with particular relevance to people with fatty liver disease.^[5][8]

Some proponents suggest that the medium-chain triglycerides (MCTs) in coconut oil are metabolised differently from long-chain saturated fats. However, the evidence in humans does not currently support coconut oil as a safe or beneficial choice for people with MASLD. Importantly, most MCT research has used purified MCT oil, which has a very different fatty acid composition from whole coconut oil; the two are not equivalent and findings from purified MCT studies cannot be directly applied to coconut oil. Some small studies have not demonstrated clear harm from coconut oil at low doses, but these are insufficient in size and duration to overturn the broader evidence base, and no UK guideline body endorses coconut oil for liver health.

The NHS and UK dietary guidelines recommend replacing saturated fats with unsaturated alternatives such as olive oil and rapeseed oil rather than adding coconut oil to the diet. People with a confirmed diagnosis of fatty liver disease should discuss specific dietary changes with their GP or a registered dietitian before making significant alterations to their fat intake.

What do UK dietitians recommend for a fatty liver diet?

UK dietitians recommend the Mediterranean diet, endorsed by NICE NG49, emphasising vegetables, wholegrains, oily fish and olive oil while limiting saturated fat, refined carbohydrates and added sugars.

UK dietitians, guided by evidence and British Dietetic Association (BDA) recommendations, advise a whole-diet approach for managing fatty liver disease rather than focusing on single foods or nutrients in isolation. The most consistently supported dietary pattern for MASLD is the Mediterranean diet, which is endorsed by both NICE NG49 and the EASL-EASD-EASO MASLD clinical practice guideline. This pattern emphasises vegetables, legumes, wholegrains, oily fish, nuts, seeds and olive oil, while limiting red and processed meat, refined carbohydrates and added sugars.

Reducing overall caloric intake to achieve a modest weight loss of 5 to 10 per cent of body weight has been shown in clinical studies, and is cited in NICE NG49 and the EASL-EASD-EASO guideline, to meaningfully reduce liver fat and inflammation.^[2][3] However, dietary quality matters independently of weight loss. Limiting free sugars, particularly fructose found in sugary drinks and ultra-processed foods, is a specific priority. SACN evidence on carbohydrates and free sugars supports the view that fructose consumed in excess is preferentially converted to fat in the liver through a process called de novo lipogenesis.^[10]

Olive oil, particularly extra virgin olive oil, is the preferred cooking fat in this context. It is rich in monounsaturated fatty acids and polyphenols, and some evidence suggests it may have a modest beneficial effect on liver health, though it is not a licensed treatment and should be seen as part of an overall dietary pattern rather than a standalone remedy. Oily fish such as salmon, mackerel and sardines provide omega-3 fatty acids, which have been associated with reduced liver triglycerides in several trials and meta-analyses; however, omega-3 supplementation is adjunctive to, not a substitute for, broader lifestyle change, and effects on liver histology remain less certain.

Alcohol should be minimised or avoided entirely. The UK Chief Medical Officers' low-risk drinking guideline advises no more than 14 units per week spread across three or more days, with alcohol-free days each week.^[11] For people with established steatohepatitis or advanced fibrosis, specialist advice may recommend complete abstinence; the British Liver Trust provides clear patient guidance on alcohol and liver disease.

A referral to a registered dietitian via a GP is the most appropriate route for personalised dietary advice. Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online consultations with prescriber review and pharmacist support, which may be a useful starting point for those seeking clinical guidance on metabolic health.

Which fats should you limit or avoid with fatty liver disease?

Saturated fats (including coconut oil, butter and palm oil) and trans fats should be limited or avoided. Prioritise olive oil, rapeseed oil and oily fish as healthier fat sources.

Saturated fats and trans fats are the two categories most strongly associated with worsening liver fat accumulation and should be limited or avoided by people with fatty liver disease. Saturated fats are found in fatty cuts of meat, full-fat dairy products, butter, lard, palm oil and coconut oil. The NHS advises that men consume no more than 30 g of saturated fat per day and women no more than 20 g; people with fatty liver disease may benefit from staying towards the lower end of these ranges.^[12][13]

Trans fats, found in some partially hydrogenated vegetable oils and certain processed or fried foods, are particularly harmful to metabolic and liver health. The UK food industry has largely reduced artificial trans fats in manufactured products following voluntary and regulatory action, but they can still appear in some imported foods and takeaway items. Reading food labels and choosing products with no partially hydrogenated oils listed in the ingredients is a practical step.

Regarding other dietary fats, UK and international guidance focuses on replacing saturated fat with unsaturated alternatives rather than restricting polyunsaturated fats such as omega-6. Sunflower oil and corn oil are not inherently harmful in moderate amounts, and UK guidance does not recommend limiting omega-6 intake. The practical priority is to use olive oil or rapeseed oil as the main cooking fat and to increase oily fish intake for omega-3 fatty acids.

In summary, the fats to prioritise are:

• Monounsaturated fats: olive oil, rapeseed oil, avocado, unsalted nuts

• Omega-3 polyunsaturated fats: oily fish (salmon, mackerel, sardines), flaxseed, walnuts

The fats to limit or avoid are:

• Saturated fats: coconut oil, butter, lard, fatty meat, full-fat dairy, palm oil

• Trans fats: partially hydrogenated oils, some fried and processed foods

Anyone concerned about their liver health should speak to their GP, who can arrange appropriate blood tests including FIB-4 scoring, and refer to a dietitian for tailored nutritional support. Urgent symptoms, including jaundice, abdominal swelling, vomiting blood, black tarry stools, confusion or unexplained weight loss, require prompt medical attention.

Scientific References

1. Understanding the evolving nomenclature of steatotic liver disease (Brennan PN et al.).
2. Non-alcoholic fatty liver disease (NAFLD) / Metabolic dysfunction-associated steatotic liver disease: assessment and management (NG49).
3. Non-alcoholic fatty liver disease (NAFLD) – short version of draft guideline (NG49).
4. Resmetirom (Rezdiffra) authorised to treat metabolic dysfunction-associated steatohepatitis (MASH) in adults.
5. Facts about fat.
6. Overeating saturated fat promotes fatty liver and ceramides compared to polyunsaturated fat (Rosqvist F et al.).
7. Overfeeding polyunsaturated and saturated fat causes distinct effects on liver and visceral fat accumulation in humans (Rosqvist F et al.).
8. Saturated fats and health: SACN report.
9. SACN statement on expressing energy, fat and carbohydrate intakes and recommendations.
10. SACN Carbohydrates and Health Report.
11. Alcohol consumption: advice on low risk drinking (UK Chief Medical Officers).
12. How to eat less saturated fat.
13. Fat facts – British Dietetic Association.

Frequently Asked Questions