I have fatty liver: should I worry?

The sentence almost everyone hears

"You have fatty liver, but don't worry." Leaving a consultation with that sentence is the commonest outcome, and it leaves the patient in an awkward position: aware of having something, unsure how much it matters, with nobody having said what to do about it.

The sentence is not entirely wrong. Most fatty livers do not progress badly. The problem is that some do, and an ultrasound cannot tell you which group you belong to.

What actually determines the outlook

Two things are constantly conflated and worth separating.

Fat is what the ultrasound sees and what gives the finding its name. On its own it says rather little.

Fibrosis is the scarring left by inflammation sustained over years. It is what determines the outlook, and it is not visible on a standard ultrasound.

Why normal blood tests are less reassuring than they seem

This is probably the most surprising point: advanced fibrosis can be present with entirely normal transaminases.

Transaminases indicate active damage at a given moment, not accumulated scarring. A liver that has been slowly inflamed for years can produce impeccable figures.

So "I was told my blood tests are fine" does not rule anything out on its own. It is good news, but it is not the answer to the question.

What FibroScan is and what it adds

It is an ultrasound technique that measures liver stiffness. The logic is simple: the more scarring a tissue holds, the stiffer it is and the faster a wave travels through it.

The same examination also quantifies the amount of fat, which tells you considerably more than the "bright liver" usually described on ultrasound.

• Painless, with no needles or contrast
• No sedation needed
• Takes a few minutes
• Requires only a few hours of fasting
• The result is available immediately

And most importantly: in most cases it avoids the need for a liver biopsy, which not so many years ago was the only way to know.

When it is worth investigating

• Fatty liver found on any ultrasound, even if you were told it did not matter
• Persistently raised transaminases
• Type 2 diabetes or insulin resistance
• Obesity, hypertension or abnormal cholesterol and triglycerides
• Raised ferritin with no explanation
• Family history of cirrhosis or advanced liver disease
• Alcohol intake that, added to the above, may be contributing

What can be done, and what actually works

There is no single pill that resolves fatty liver, and anyone promising one deserves scepticism. What does exist is a set of measures with demonstrated effect.

• Sustained weight loss. The most effective measure. Modest reductions improve the fat; larger ones can reverse inflammation and even part of the fibrosis
• A Mediterranean eating pattern, with particular attention to sugary drinks and added fructose
• Regular exercise, which improves the liver even when weight barely moves
• Control of diabetes, cholesterol and blood pressure, alongside your usual doctor
• Review of alcohol and of the medication and supplements you take

In patients meeting specific medical criteria, GLP-1 receptor agonists have changed the picture, helping achieve sustained weight loss and improving the metabolic profile. They are not a shortcut or a consumer product: they require prior medical assessment, follow-up and, above all, the changes listed above to build on.

What I find decisive

That what gets measured can be treated properly. Knowing your degree of fibrosis turns a generic recommendation into a plan with a starting point and a way of checking whether it is working.

Repeating elastography after a period shows whether fibrosis is stable, improving or progressing. Without that measurement you are left with the subjective sense of doing things right, which does not always match what is happening to the liver.