Carbs for Fatty Liver: What to Eat and Avoid

Carbs for fatty liver disease is a topic of growing clinical importance, as dietary carbohydrate quality and quantity directly influence how much fat accumulates in the liver. Metabolic dysfunction-associated steatotic liver disease (MASLD) affects an estimated one in three to four adults in the UK to some degree, and refined carbohydrates and free sugars are among the most significant dietary drivers of liver fat. Understanding which carbohydrates to limit, which to favour, and how overall dietary patterns affect liver health can make a meaningful difference to outcomes for people managing this condition.

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

Fatty liver disease occurs when excess fat accumulates in liver cells, and a diet high in refined carbohydrates and added sugars worsens this by promoting de novo lipogenesis and insulin resistance. Dietary modification is a primary evidence-based intervention for MASLD.

Fatty liver disease occurs when excess fat accumulates within liver cells. The condition is broadly divided into alcohol-related fatty liver disease (ARLD) and metabolic dysfunction-associated steatotic liver disease (MASLD), previously known as non-alcoholic fatty liver disease (NAFLD). MASLD is closely linked to obesity, type 2 diabetes, and insulin resistance, and is one of the most common chronic liver conditions in the UK, affecting an estimated one in three to four adults to some degree according to the British Liver Trust.^[1]

Dietary choices, particularly the type and quantity of carbohydrates consumed, are important modifiable factors in MASLD, alongside overall energy balance, saturated fat intake, and physical activity levels. When carbohydrates are consumed in excess, particularly refined and high-sugar varieties, the liver converts surplus glucose into fat through a process called de novo lipogenesis. Over time, this fat accumulates within hepatocytes (liver cells), impairing liver function and potentially progressing to inflammation (steatohepatitis), fibrosis, and in some cases cirrhosis. Insulin resistance, which is both a cause and consequence of MASLD, further amplifies this cycle by promoting fat storage in the liver. These mechanisms are described in NICE guideline NG49 and the 2024 EASL-EASD-EASO MASLD clinical practice guideline.^[2][3]

Diet is central to managing fatty liver disease because the liver is the primary organ responsible for processing nutrients absorbed from the gut. A diet high in refined carbohydrates and added sugars is consistently associated with raised liver fat levels, while a diet rich in fibre, whole grains, and minimally processed foods supports liver health. Understanding which carbohydrates are most harmful, and which are beneficial, is therefore a practical and evidence-based starting point for anyone managing this condition.

Which carbohydrates are most harmful to a fatty liver?

Sugar-sweetened beverages, ultra-processed foods, white bread, white rice, and confectionery are the most harmful carbohydrates for fatty liver, as they deliver fructose and refined sugars rapidly, driving liver fat accumulation. SACN recommends free sugars contribute no more than 5 per cent of total dietary energy.

The carbohydrates most harmful to a fatty liver are free sugars and highly refined starches, particularly fructose, sucrose, and rapidly digested starchy foods that cause sharp rises in blood glucose and insulin. Research suggests that high fructose intake may be especially damaging, because unlike glucose, fructose is metabolised predominantly in the liver and can promote de novo lipogenesis. Evidence from randomised controlled trials and systematic reviews, including studies published in Hepatology and the Journal of Hepatology, indicates that high intake of sugar-sweetened beverages is associated with greater liver fat accumulation, though the relative contribution of fructose versus overall excess calorie intake remains an area of ongoing research.

The following carbohydrate sources are associated with worsening liver fat accumulation:

• Sugar-sweetened beverages (fizzy drinks, fruit juices, energy drinks): these deliver large quantities of fructose and sucrose rapidly, with no fibre to slow absorption. The NHS advises limiting 100% fruit juice to no more than 150 ml per day, as it counts as a free sugar.^[10][11]

• Ultra-processed foods (biscuits, cakes, pastries, breakfast cereals with added sugar): high in refined flour and added sugars

• White bread, white rice, and white pasta: rapidly digested, causing pronounced glucose and insulin spikes

• Confectionery and sweets: concentrated sources of sucrose and glucose-fructose syrups

• Alcohol: while not a carbohydrate in the traditional sense, alcoholic drinks often contain significant sugar and directly promote hepatic fat accumulation

Reading food labels for terms such as "glucose-fructose syrup" or "sugar" is a practical step for anyone managing fatty liver disease. The Scientific Advisory Committee on Nutrition (SACN) Carbohydrates and Health report (2015) recommends that free sugars contribute no more than 5 per cent of total dietary energy for adults and children over two years of age.^[12]

How many carbs should you eat per day if you have fatty liver?

There is no single agreed daily carbohydrate target; NICE NG49 recommends a healthy balanced diet with reduced calorie intake rather than a specific gram limit. Low-carbohydrate diets below 130 g per day have shown benefit but should be undertaken with dietitian support.

There is no single universally agreed daily carbohydrate target for people with fatty liver disease. The most important factor is not simply the quantity of carbohydrates but their quality and the overall dietary pattern. NICE guideline NG49 (Non-alcoholic fatty liver disease: assessment and management) recommends a healthy balanced diet with reduced calorie intake where weight loss is indicated, rather than specifying a precise carbohydrate gram target.

Clinical trials of low-carbohydrate dietary interventions in MASLD have used a range of carbohydrate intakes, and systematic reviews suggest that reducing refined carbohydrate and free sugar intake can reduce liver fat. A calorie deficit is also an important component of weight management in MASLD; NICE obesity guidance describes energy deficit approaches as part of structured weight management, and clinicians commonly discuss a deficit in the region of 500 to 1,000 kilocalories per day as a general framework, though individual targets should be agreed with a healthcare professional.

For practical guidance, the following principles are broadly supported by evidence:

• Free sugars (those added to food or naturally present in honey, syrups, and fruit juices) should be kept below 5 per cent of total energy intake, in line with SACN recommendations

• Total carbohydrate from whole food sources (vegetables, legumes, whole grains) can be retained as part of a balanced diet

• Low-carbohydrate diets (typically defined as below 130 grams per day) have shown benefit in clinical trials for reducing liver fat, but should be undertaken with dietitian support, particularly in people with type 2 diabetes who may need medication adjustments^[17][5]

Important safety note: people taking insulin or sulfonylureas (such as gliclazide or glibenclamide) who significantly reduce their carbohydrate intake are at increased risk of hypoglycaemia (low blood sugar).^[18] Anyone on these medicines should speak to their GP or diabetes team before making substantial changes to their carbohydrate intake, so that medication doses can be reviewed and blood glucose monitored appropriately.

Individual needs vary, and a referral to a registered dietitian is the most appropriate route for personalised targets. People who are pregnant or breastfeeding should not follow very low-carbohydrate diets without specialist input.

Best carbohydrate swaps to support liver health

Replacing refined carbohydrates with fibre-rich alternatives, such as wholegrain bread, porridge oats, and whole fruit instead of juice, is a well-supported strategy for reducing liver fat. The Mediterranean dietary pattern, emphasising whole grains, vegetables, and legumes, is recommended in the 2024 EASL-EASD-EASO guideline.

Replacing refined and high-sugar carbohydrates with fibre-rich, minimally processed alternatives is one of the most evidence-supported dietary strategies for improving liver health in people with MASLD. These swaps do not require eliminating carbohydrates entirely but focus on choosing sources that are digested more slowly, produce a lower glycaemic response, and provide additional nutrients that support metabolic health.

Practical carbohydrate swaps:

• White bread to wholegrain or rye bread: higher in fibre, lower glycaemic index, supports gut health and slower glucose absorption

• White rice to brown rice, quinoa, or cauliflower rice: reduces the glycaemic load of a meal

• Sugary breakfast cereals to plain porridge oats: oats contain beta-glucan, a soluble fibre associated with improvements in insulin sensitivity and blood lipids in clinical studies

• Fruit juice to whole fruit: retains fibre, slows fructose absorption, and reduces the overall sugar load. If fruit juice is consumed, the NHS advises limiting it to no more than 150 ml per day

• Fizzy drinks and squash to water, sparkling water, or unsweetened herbal teas: eliminates free sugars entirely

• Biscuits and cakes to a small handful of unsalted nuts or plain yoghurt: provides protein and healthy fats without refined carbohydrates

• White pasta to wholemeal pasta or lentil-based pasta: increases fibre and protein content

Incorporating more non-starchy vegetables (broccoli, spinach, courgette, peppers) into meals is also beneficial, as these provide fibre, antioxidants, and micronutrients with minimal impact on blood glucose. SACN recommends a fibre intake of approximately 30 grams per day for adults, and the NHS Eatwell Guide provides a practical framework for achieving this.^[12][13]

The Mediterranean dietary pattern, which emphasises vegetables, legumes, whole grains, olive oil, and fish, has specific evidence for reducing liver fat and is referenced in the 2024 EASL-EASD-EASO MASLD clinical practice guideline as a suitable dietary framework for people with MASLD.^[16]

Does cutting carbs actually reverse fatty liver disease?

Reducing refined carbohydrates and achieving 7 to 10 per cent body weight loss can meaningfully reduce liver fat and may reverse early-stage fatty liver disease, particularly simple steatosis. Advanced fibrosis or cirrhosis is less readily reversible, and sustained dietary change is required to prevent rebound.

Reducing refined carbohydrate and sugar intake can meaningfully reduce liver fat and, in some cases, reverse early-stage fatty liver disease, particularly when combined with overall calorie reduction and weight loss. The evidence for this is supported by multiple clinical trials and systematic reviews. A study by Mardinoglu et al. published in Cell Metabolism (2018) reported a substantial reduction in liver fat over two weeks in people with MASLD following a low-carbohydrate, high-protein diet; however, this was a short-term study with a small sample, and its findings should not be taken as universally generalisable. Longer-term systematic reviews and randomised controlled trials support the view that sustained dietary change, including reduced carbohydrate intake, can lead to measurable reductions in liver fat and, in some cases, improvements in liver inflammation and fibrosis as assessed by biopsy or MRI-based fat quantification.

Weight loss of 7 to 10 per cent of body weight is consistently associated with significant reductions in liver fat and is a target referenced in NICE guideline NG49 for people who are overweight or living with obesity.^[2][3] Low-carbohydrate diets are one effective tool for achieving this weight loss.

However, several important caveats apply:

• Very low-carbohydrate (ketogenic) diets may produce rapid initial results but are difficult to sustain long-term and require medical supervision, particularly in people with diabetes or kidney disease

• Reversal is most achievable in early stages: simple steatosis (fat accumulation without significant inflammation) is more readily reversible than advanced fibrosis or cirrhosis

• Rebound is possible: liver fat can return if dietary changes are not maintained

• No single dietary approach suits everyone: individual metabolic responses vary, and some people respond better to calorie restriction alone

When to seek urgent help: if you experience yellowing of the skin or whites of the eyes (jaundice), swelling of the abdomen, vomiting blood or passing black tarry stools, confusion or unusual drowsiness, or severe pain in the upper right abdomen, seek urgent medical attention by calling 999 or going to your nearest A&E department. These may be signs of advanced liver disease requiring immediate assessment.

Anyone with a confirmed or suspected diagnosis of fatty liver disease should speak to their GP, who can arrange appropriate investigations. In UK primary care, assessment typically begins with a FIB-4 score (calculated from routine blood tests) to estimate the risk of significant liver fibrosis. Where the FIB-4 result is indeterminate or elevated, NICE diagnostic guidance DG34 supports the use of the Enhanced Liver Fibrosis (ELF) test as a second-line assessment. Depending on results, referral to a hepatologist or specialist dietitian may be arranged.

What does NHS and NICE guidance say about diet and fatty liver?

NICE guideline NG49 identifies dietary modification and weight management as the cornerstone of MASLD treatment, recommending a healthy balanced diet, reduced free sugar intake, and structured weight loss where appropriate. There is currently no licensed first-line pharmacological treatment for MASLD.

NHS and NICE guidance consistently identifies dietary modification and weight management as the cornerstone of treatment for metabolic dysfunction-associated steatotic liver disease (MASLD), previously referred to as non-alcoholic fatty liver disease (NAFLD). NICE guideline NG49 (Non-alcoholic fatty liver disease: assessment and management), which uses the NAFLD terminology, recommends a healthy balanced diet, regular physical activity, and, where appropriate, structured weight loss programmes. There is currently no licensed pharmacological treatment recommended as a first-line intervention for MASLD itself.

Key points from NHS and NICE guidance relevant to carbohydrate intake include:

• Reducing free sugar intake is recommended in line with SACN guidance, which advises that free sugars should contribute no more than 5 per cent of total dietary energy for adults

• A Mediterranean-style diet is supported by the 2024 EASL-EASD-EASO MASLD clinical practice guideline as a suitable dietary pattern, given its emphasis on whole grains, vegetables, legumes, and unsaturated fats

• Weight loss of 7 to 10 per cent of body weight is associated with significant liver fat reduction and is a target referenced in NICE NG49 for people who are overweight or living with obesity^[2][3]

• Referral to a dietitian is recommended for people who require structured dietary support, particularly those with comorbidities such as type 2 diabetes

• Alcohol should be minimised or avoided, even in MASLD, as it can accelerate liver damage. The UK Chief Medical Officers advise that both men and women should drink no more than 14 units of alcohol per week, spread over three or more days, with several alcohol-free days each week.^[22][23] NHS support for reducing alcohol intake is available through your GP or via the NHS website

• In UK primary care, NICE diagnostic guidance DG34 supports the use of the ELF test as a second-line non-invasive assessment for liver fibrosis, following initial FIB-4 scoring

NICE does not endorse any specific branded diet or very low-carbohydrate programme for MASLD, and individuals should be cautious of commercial dietary plans that make unsupported claims. The NHS Eatwell Guide provides a practical framework for balanced eating that aligns with these principles. Anyone concerned about their liver health should speak to their GP in the first instance, who can arrange blood tests, imaging, and onward referral as appropriate.

If you are exploring weight management support as part of managing MASLD, Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online weight-management consultations, with prescriber review and pharmacist support, where clinically appropriate options may be considered.

Scientific References

1. British Liver Trust – Fatty liver disease.
2. Metabolic dysfunction-associated steatotic liver disease (MASLD): assessment and management. Guideline NG49.
3. MASLD: assessment and management – NG49 full guideline PDF.
4. Chiu S et al. Dietary carbohydrates and fatty liver disease. 2018.
5. Mardinoglu A et al. An Integrated Understanding of the Rapid Metabolic Benefits of a Carbohydrate-Restricted Diet on Hepatic Steatosis in Humans. Cell Metabolism 2018.
6. Integrative metabolism in MASLD and MASH: Pathophysiology and emerging mechanisms. 2025.
7. The metabolic and molecular mechanisms linking fructose consumption to lipogenesis and metabolic disorders. 2025.
8. Rethinking the hepatoprotective potential of vegetarian diets in MASLD/MAFLD: a critical narrative review. 2025.
9. Watling CZ et al. Artificially Sweetened and Sugar-Sweetened Beverage intake and liver cancer. 2026.
10. Sugar: the facts.
11. 5 A Day: what counts?.
12. SACN Carbohydrates and Health Report.
13. SACN statement on expressing energy, fat and carbohydrate intakes and recommendations.
14. How to get more fibre into your diet.
15. Fibre – British Dietetic Association.
16. EASL-EASD-EASO Clinical Practice Guidelines on the management of metabolic dysfunction-associated steatotic liver disease. 2024.
17. Impact of weight loss and reduction of ultra-processed foods on liver fat content in MASLD: A randomized controlled trial. 2025.
18. Adapting Medication for Type 2 Diabetes to a Low Carbohydrate Diet. 2021.
19. Non-alcoholic fatty liver disease (NAFLD).
20. MRI-based technologies for assessing non-alcoholic fatty liver disease (HTG65): The diagnostic tests – includes reference to ELF test.
21. Kang YW et al. Sequential Diagnostic Approach Using FIB-4 and ELF for liver fibrosis in MASLD. 2024.
22. UK Chief Medical Officers. Alcohol consumption: advice on low risk drinking. GOV.UK.
23. Drink less alcohol – Better Health – NHS.

Frequently Asked Questions