What is fatty liver disease?

Fatty liver disease means excess fat stored in liver cells — usually linked to obesity, type 2 diabetes, and metabolic syndrome rather than alcohol. Most people have no symptoms — found on blood tests or scans. Weight loss of 5 to 10% is the main treatment. A small proportion progresses to inflammation (NASH) and cirrhosis. See a GP if liver blood tests are abnormal — exclude alcohol and other causes.

What causes a fatty liver?

Excess calories stored as fat in liver cells — strongly linked to obesity, insulin resistance, type 2 diabetes, high cholesterol, and metabolic syndrome. Less commonly rapid weight loss, certain medicines, or genetic factors. Alcohol-related fatty liver is separate diagnosis — alcohol intake must be assessed honestly.

Can fatty liver be reversed?

Yes — weight loss of 5 to 10% body weight reduces liver fat and inflammation in most people. Exercise improves liver enzymes even without major weight loss. Controlling diabetes and cholesterol helps. Simple fatty liver often fully reverses; scarring (fibrosis) may be partially reversible early.

What are the symptoms of fatty liver disease?

Usually none — discovered on routine blood tests (raised ALT) or ultrasound. Advanced disease — tiredness, discomfort upper right abdomen, jaundice, itchy skin, swollen legs or abdomen — signs of cirrhosis. Most never reach this stage with lifestyle intervention.

Is fatty liver dangerous?

Simple steatosis is low short-term risk. NASH with inflammation and fibrosis can progress to cirrhosis, liver failure, and liver cancer over years — similar pathways to alcohol cirrhosis. Cardiovascular disease risk is also elevated — manage heart risk factors.

What should I eat for fatty liver?

Mediterranean-style diet — vegetables, whole grains, olive oil, fish; limit sugary drinks, refined carbs, and processed food. No specific miracle food — calorie deficit if overweight matters most. Coffee may have modest protective association in studies — not a treatment alone.

Do I need a liver biopsy?

Not routinely — non-invasive scores (Fib-4, ELF test, FibroScan) estimate fibrosis in many cases. Biopsy reserved for uncertain diagnosis or research — specialist decision.

Fatty liver disease: Symptoms & Treatment

Fatty liver disease — NAFLD explained

Non-alcohol related fatty liver disease (NAFLD) — now often termed MASLD (metabolic dysfunction-associated steatotic liver disease) in updated nomenclature — is excess fat in liver cells not primarily caused by alcohol.

It affects an estimated 20 to 30% of UK adults — parallel to obesity and type 2 diabetes epidemics. Most people never know they have it until blood tests or ultrasound for other reasons.

Spectrum of disease

Stage	Name	Risk
Simple steatosis	Fat only	Low — liver function often normal
NASH	Steatohepatitis — inflammation	Moderate — can scar
Fibrosis	Scarring	Progressive
Cirrhosis	End-stage scarring	Liver failure, cancer risk

Not everyone progresses — majority remain stable with simple fat.

Causes and risk factors

obesity — especially abdominal fat
type 2 diabetes and prediabetes
insulin resistance
high cholesterol/triglycerides
metabolic syndrome
polycystic ovary syndrome
** obstructive sleep apnoea**
rapid weight loss — paradoxically can worsen NASH transiently
genetics — PNPLA3 variant common

Alcohol: any intake adds injury — honest alcohol history essential — dual pathology common.

Symptoms

Early: asymptomatic

Later (cirrhosis):

fatigue
right upper abdominal discomfort
jaundice — yellow skin/eyes
itchy skin
ascites — fluid belly
leg swelling
easy bruising
confusion — encephalopathy

Diagnosis

GP pathway:

Abnormal LFTs — raised ALT/AST (ALT often higher)
Exclude other causes:
- alcohol-related liver disease — AUDIT questionnaire
- hepatitis B and C
- autoimmune hepatitis
- haemochromatosis — ferritin, transferrin saturation
- coeliac disease — if indicated
Ultrasound — bright liver, excludes focal lesions
Fibrosis assessment — Fib-4 calculation, FibroScan in secondary care

Treatment — no magic pill (yet)

Weight loss — cornerstone

7 to 10% body weight loss:

reduces liver fat
improves NASH histology in trials
see weight loss guide

Exercise

150 to 200 minutes weekly — improves enzymes independent of weight loss

Metabolic control

HbA1c targets in diabetes
statins — safe in NAFLD — reduce CV risk
blood pressure control

Medicines

vitamin E — selected non-diabetic NASH — specialist
pioglitazone — insulin sensitiser — specialist
GLP-1 agonists — emerging evidence for liver fat reduction in obesity/diabetes
no universal NHS pill for all NAFLD yet

Alcohol

** abstinence or minimal** — even moderate alcohol accelerates harm in fatty liver

Monitoring

Regular LFTs — track trend
Fibrosis reassessment if risk factors persist
Screen for cardiovascular disease — main cause of death in NAFLD patients

When to worry

Urgent referral:

jaundice
ascites
variceal bleed
platelets falling, albumin low — synthetic function failing

Fatty liver is reversible early — weight and metabolic health are treatment; ignoring abnormal LFTs risks preventable cirrhosis.

Common questions about fatty liver disease

What causes a fatty liver?: Excess calories stored as fat in liver cells — strongly linked to obesity, insulin resistance, type 2 diabetes, high cholesterol, and metabolic syndrome. Less commonly rapid weight loss, certain medicines, or genetic factors. Alcohol-related fatty liver is separate diagnosis — alcohol intake must be assessed honestly.
Can fatty liver be reversed?: Yes — weight loss of 5 to 10% body weight reduces liver fat and inflammation in most people. Exercise improves liver enzymes even without major weight loss. Controlling diabetes and cholesterol helps. Simple fatty liver often fully reverses; scarring (fibrosis) may be partially reversible early.
What are the symptoms of fatty liver disease?: Usually none — discovered on routine blood tests (raised ALT) or ultrasound. Advanced disease — tiredness, discomfort upper right abdomen, jaundice, itchy skin, swollen legs or abdomen — signs of cirrhosis. Most never reach this stage with lifestyle intervention.
Is fatty liver dangerous?: Simple steatosis is low short-term risk. NASH with inflammation and fibrosis can progress to cirrhosis, liver failure, and liver cancer over years — similar pathways to alcohol cirrhosis. Cardiovascular disease risk is also elevated — manage heart risk factors.
What should I eat for fatty liver?: Mediterranean-style diet — vegetables, whole grains, olive oil, fish; limit sugary drinks, refined carbs, and processed food. No specific miracle food — calorie deficit if overweight matters most. Coffee may have modest protective association in studies — not a treatment alone.
Do I need a liver biopsy?: Not routinely — non-invasive scores (Fib-4, ELF test, FibroScan) estimate fibrosis in many cases. Biopsy reserved for uncertain diagnosis or research — specialist decision.

Sources

How we reviewed this page

Medically reviewed by the HealthAnswers UK doctor review panel

First published: 14 June 2026
Medically reviewed: 3 July 2026
Next review due: 3 July 2029 or sooner if NHS or NICE guidance changes

Written by HealthAnswers editorial team. Published by HealthAnswers (Elite Digital AI Solutions Ltd). How we review content · Report a problem with this page