Does Fatty Liver Make You Tired?

Fatty liver disease is a common condition that many people do not realise they have, yet one of its most frequently reported symptoms is persistent tiredness. Does fatty liver make you tired? The short answer is yes, though the relationship is complex and involves impaired liver metabolism, low-grade inflammation, and closely linked conditions such as insulin resistance and obesity. This article explains why a fatty liver can drain your energy, what other symptoms to look out for, which lifestyle changes can help, and when to seek medical advice from your GP.

Can fatty liver disease actually cause fatigue and tiredness?

Yes, fatty liver disease is a recognised cause of persistent fatigue, arising from impaired liver metabolism, systemic inflammation, and associated conditions such as insulin resistance and type 2 diabetes.

Yes, fatty liver disease can cause fatigue and tiredness, and this is among the most commonly reported symptoms among people living with the condition. Fatty liver disease, known medically as hepatic steatosis, occurs when excess fat accumulates within liver cells. It is broadly divided into metabolic dysfunction-associated steatotic liver disease (MASLD, previously called non-alcoholic fatty liver disease or NAFLD) and alcohol-related liver disease (ALD). Both forms can produce fatigue, though the mechanisms are not fully understood and the symptom is not universal.

In its early stages, fatty liver disease is often entirely silent, with many people experiencing no symptoms at all. However, as the condition progresses, particularly when inflammation develops (a stage called steatohepatitis), fatigue becomes more frequently reported. It tends to be a persistent, low-level exhaustion that does not resolve with rest, rather than a sudden or dramatic change in energy.

Fatigue associated with fatty liver disease is thought to arise from a combination of factors, including impaired liver metabolism, low-grade systemic inflammation, and the presence of related conditions such as insulin resistance, obesity, and type 2 diabetes, all of which independently contribute to low energy. Because these conditions frequently coexist, it can be difficult to attribute tiredness solely to the liver.

It is also worth noting that other conditions common in people with MASLD, including obstructive sleep apnoea, hypothyroidism, and anaemia, can independently cause significant fatigue. A GP assessment will typically screen for these alongside liver-specific causes. NICE guidance on NAFLD (NG49) and NHS patient information both recognise fatigue as a feature of the condition, while acknowledging its multifactorial nature. Note that NICE NG49 uses the older term NAFLD; this is equivalent to MASLD under current international nomenclature.

Why does a damaged liver affect your energy levels?

A damaged liver disrupts blood glucose regulation, glycogen storage, and nutrient metabolism, while inflammatory cytokines from steatohepatitis further reduce energy by affecting the brain and muscles.

A damaged liver affects energy levels because the liver plays a central role in metabolising nutrients, regulating blood glucose, and supporting normal cellular function throughout the body. When hepatic function is compromised, these processes become less efficient, leaving the body with fewer resources to sustain normal activity.

One key mechanism involves glycogen storage. A healthy liver stores glucose as glycogen and releases it steadily between meals to maintain blood sugar levels. When liver cells are damaged or infiltrated with fat, this regulatory function is disrupted, leading to fluctuations in blood glucose that can contribute to fatigue and difficulty concentrating. Insulin resistance, which is closely associated with MASLD, compounds this problem by reducing the efficiency with which cells take up glucose for energy.

Low-grade systemic inflammation is another important contributor. In steatohepatitis, inflammatory cytokines are released into the bloodstream and can affect the brain and muscles, producing a state sometimes described as sickness behaviour, characterised by fatigue, low mood, and reduced motivation. This is a recognised phenomenon in chronic inflammatory conditions more broadly.

Comorbid conditions that frequently accompany MASLD, particularly obstructive sleep apnoea and metabolic syndrome, can substantially worsen daytime fatigue and should be considered alongside liver-specific mechanisms. Sleep apnoea in particular is common in people with obesity and insulin resistance, and treating it can produce meaningful improvements in energy levels.

Note: some sources suggest that even early liver disease may allow low levels of metabolic by-products such as ammonia to circulate, contributing to cognitive slowing. However, clinically significant ammonia accumulation is a feature of advanced liver disease and hepatic encephalopathy rather than early fatty liver, and this mechanism should not be overstated in the context of MASLD.

What other symptoms often appear alongside tiredness in fatty liver?

Common accompanying symptoms include upper right abdominal discomfort, brain fog, nausea, and elevated liver enzymes on blood tests, though many people remain asymptomatic for years.

Alongside fatigue, fatty liver disease can produce a range of other symptoms, though many people remain asymptomatic for years and the condition is often detected incidentally during blood tests or abdominal imaging. When symptoms do occur, they tend to be non-specific, which is one reason fatty liver disease is frequently underdiagnosed.

Common symptoms that may accompany tiredness include:

• Discomfort or a dull ache in the upper right abdomen, where the liver sits beneath the ribcage. This is caused by the liver becoming enlarged (hepatomegaly) and stretching its outer capsule.

• Brain fog and difficulty concentrating, which may reflect the same metabolic and inflammatory processes that cause physical fatigue.

• Nausea, which can occur in fatty liver disease, though it is non-specific and may have other causes. Post-meal nausea that is specifically triggered by fatty foods is more characteristic of gallbladder disease (such as gallstones) than of uncomplicated MASLD, and should be assessed by a GP if persistent.

• Elevated liver enzymes, detected on blood tests (typically alanine aminotransferase, ALT, and aspartate aminotransferase, AST), which may prompt further investigation. Importantly, normal ALT and AST results do not exclude MASLD or steatohepatitis; a significant proportion of people with confirmed fatty liver disease have liver enzymes within the normal range.

It is also worth noting that obesity and metabolic syndrome are underlying risk factors that drive fat accumulation in the liver, rather than symptoms of the liver disease itself. Difficulty managing weight is common in this context and reflects the shared metabolic dysfunction.

In more advanced disease, where fibrosis or cirrhosis has developed, additional signs may appear, including jaundice (yellowing of the skin or whites of the eyes), swelling of the abdomen (ascites), easy bruising, and itching. These represent a significant progression and require prompt medical assessment. The absence of obvious symptoms does not mean the liver is unaffected, and routine monitoring is recommended for those with known risk factors such as obesity, type 2 diabetes, or metabolic syndrome.

What lifestyle changes can help reduce fatigue caused by fatty liver?

A Mediterranean-style diet, regular aerobic and resistance exercise, and gradual weight loss of 7 to 10 per cent are the most evidence-based interventions for reducing liver fat and improving energy.

Lifestyle modification is the cornerstone of managing MASLD and the fatigue associated with it. NICE guidance (NG49) emphasises weight management, dietary change, and increased physical activity as first-line interventions, and clinical evidence consistently shows that even modest improvements can meaningfully reduce liver fat and improve energy levels.

Diet: A Mediterranean-style diet, rich in vegetables, legumes, wholegrains, oily fish, and olive oil, has the strongest evidence base for reducing liver fat, as recognised in EASL clinical practice guidelines on MASLD.^[5] Reducing intake of ultra-processed foods, refined carbohydrates, added sugars, and saturated fats is particularly important. Fructose, found in high quantities in sugary drinks and processed foods, is especially implicated in hepatic fat accumulation and should be minimised.^[5]

Weight loss: Clinical studies and NICE NG49 indicate that a sustained reduction in body weight of 7 to 10 per cent can significantly reduce liver fat, inflammation, and fibrosis in people with MASLD, while even a 3 to 5 per cent reduction can reduce steatosis.^[2] Weight loss should be gradual and sustainable. Very low-calorie diets can improve steatosis when medically supervised, but rapid or unsupervised weight loss carries a risk of gallstone formation and should be undertaken with professional guidance.

Physical activity: Both aerobic exercise and resistance training have been shown to reduce liver fat independently of weight loss, per EASL guidelines.^[5] The UK Chief Medical Officers' Physical Activity Guidelines recommend at least 150 minutes of moderate-intensity activity per week for adults, alongside muscle-strengthening activities on two or more days. Regular exercise also directly improves energy levels by reducing systemic inflammation.

Alcohol: For those with alcohol-related liver disease, reducing or stopping alcohol consumption is essential. Even in MASLD, the UK Chief Medical Officers' low-risk drinking guidelines recommend keeping alcohol intake to no more than 14 units per week, spread across several days, as alcohol adds additional metabolic burden to an already stressed liver.

Sleep and stress: Poor sleep and chronic stress worsen insulin resistance and fatigue. Addressing sleep hygiene, and seeking assessment for obstructive sleep apnoea where relevant, are clinically important components of care that are often overlooked.

When should you see a GP about tiredness and liver concerns?

See a GP if fatigue is unexplained and lasts more than a few weeks, especially alongside jaundice, abdominal pain, dark urine, swelling, or easy bruising.

You should see your GP if you experience persistent, unexplained fatigue that does not improve with rest, particularly if it is accompanied by any symptoms that may suggest liver involvement. Early assessment is important because fatty liver disease is often silent until it has progressed to a more serious stage, and timely diagnosis allows for intervention before significant fibrosis or cirrhosis develops.

Contact your GP promptly if you notice any of the following:

• Persistent tiredness lasting more than a few weeks with no obvious explanation such as poor sleep or overexertion

• Discomfort or pain in the upper right abdomen

• Unexplained weight loss (as distinct from intentional weight management)

• Yellowing of the skin or eyes (jaundice)

• Dark urine or pale stools, which can indicate bile flow problems

• Swelling of the abdomen or legs

• Easy bruising or bleeding

Your GP may arrange blood tests including liver function tests, a fasting glucose or HbA1c, a lipid profile, a full blood count, thyroid function tests, and ferritin. An aetiology screen to exclude other causes of liver disease, such as hepatitis B and C serology and autoimmune markers, is also part of standard primary care assessment per BSG guidance.^[10] An abdominal ultrasound is commonly used to assess liver size and echogenicity, though it has limited sensitivity for mild steatosis and a normal scan does not exclude early fatty liver disease.^[2][5] Remember that normal ALT and AST results also do not exclude MASLD.

If results suggest significant liver disease, your GP may calculate a fibrosis risk score such as the FIB-4 index or NAFLD Fibrosis Score (NFS) using age, blood test results, and body measurements. Where the score is indeterminate or high, NICE NG49 recommends further assessment with an enhanced liver fibrosis (ELF) test or transient elastography (FibroScan), with referral to a hepatologist or gastroenterologist where indicated.

For urgent symptoms such as sudden severe abdominal pain, vomiting blood, or confusion, call 999 or go to A&E immediately. For concerns that feel urgent but are not life-threatening, NHS 111 can provide advice. Suspected adverse effects from any prescribed medicine should be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

If you are exploring weight management support as part of addressing the metabolic factors underlying fatty liver, 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. Understanding the evolving nomenclature of steatotic liver disease (MASLD/NAFLD/ALD).
2. Metabolic dysfunction-associated steatotic liver disease (MASLD): assessment and management (NG49).
3. Non-alcoholic fatty liver disease (NAFLD).
4. Prevalence, proportions of elevated liver enzyme levels among patients with MASLD.
5. EASL-EASD-EASO Clinical Practice Guidelines on the management of metabolic dysfunction-associated steatotic liver disease.
6. Physical activity guidelines: UK Chief Medical Officers' report.
7. UK Chief Medical Officers' physical activity guidelines (full guidance).
8. Physical activity guidelines for adults aged 19 to 64.
9. Alcohol consumption: advice on low risk drinking. UK Chief Medical Officers' guidelines.
10. British Society of Gastroenterology guidelines for diagnosis and management of autoimmune hepatitis (Gleeson D et al.).

Frequently Asked Questions