Fatty liver disease means too much fat is stored in your liver cells. It is the most common liver condition in the Western world and usually causes no symptoms in the early stages. That makes it deceptive, but there is good news too: in the early phase, fatty liver is often very reversible through lifestyle.
This article explains what fatty liver disease is, how it develops, which stages exist, and when it is time to act.
What is fatty liver disease?
In fatty liver disease, more than roughly 5% of the liver weight consists of fat. A little fat is normal, but too much disrupts how your liver cells work and can eventually cause inflammation. An estimated 25 to 30% of the global population has some degree of fatty liver (Younossi et al., 2016).
Since 2023, doctors increasingly use the term MASLD (metabolic dysfunction-associated steatotic liver disease) instead of non-alcoholic fatty liver disease. The new name emphasises the link with metabolism, such as excess weight, high blood sugar and high cholesterol (Rinella et al., 2023).
What are the causes of fatty liver disease?
Fatty liver is usually tied to metabolism and lifestyle. The main risk factors:
- Excess weight, especially abdominal fat
- Insulin resistance and type 2 diabetes
- A diet rich in sugar, fructose and processed carbohydrates
- Little exercise
- High cholesterol and high triglycerides
- Alcohol - this falls under a separate form (alcoholic fatty liver), but the consequences for the liver are similar
Sometimes heredity plays a role, and certain medications can contribute. But in most cases the cause is a combination of lifestyle and metabolism.
From simple steatosis to cirrhosis: the stages
Fatty liver progresses in steps. Not everyone goes through all phases, and the pace differs greatly per person.
- Simple steatosis - fat accumulation without inflammation. Relatively harmless and very reversible.
- Steatohepatitis (NASH) - fat accumulation with inflammation. The ALAT value is often elevated and damage gradually occurs.
- Fibrosis - scarring of liver tissue. The liver begins to lose function.
- Cirrhosis - severe, permanent scarring. At this stage the complications are potentially serious.
Is fatty liver dangerous, and is it reversible?
In the early stages, fatty liver is often very reversible. Research shows that weight loss through lifestyle modification can reduce inflammation and even scarring (Vilar-Gomez et al., 2015). The sooner you catch it, the greater the chance your liver fully recovers.
It becomes more concerning as inflammation and fibrosis set in. That is why early detection via a blood test is so valuable: a mildly elevated ALAT is often the first and only signal.
How do you know if you have fatty liver?
Fatty liver rarely causes symptoms early on. A blood test with liver values is often the first hint, followed by a liver ultrasound if your doctor finds it necessary. For the signals that can occur, read our article on the causes of elevated liver values.
Want to have your liver values checked? The Vital Check liver function test measures ALAT, ASAT and gamma-GT, with a doctor who reviews your result.
Frequently asked questions
Can fatty liver be cured?
In the early phases, often yes. With weight loss, more exercise and less sugar and alcohol, the fat in the liver can decrease and inflammation can subside. At the cirrhosis stage recovery is more limited, which is why acting early matters.
Is fatty liver related to alcohol?
Not always. The most common form is unrelated to alcohol and is tied to metabolism. Alcohol use can, however, worsen fatty liver or cause its own alcoholic form.
How quickly does fatty liver disappear?
It varies per person. With consistent lifestyle change you often see improvement in your liver values after 3 to 6 months. Full recovery of the liver tissue can take longer.
References
- Younossi ZM, et al. Global epidemiology of nonalcoholic fatty liver disease - meta-analytic assessment of prevalence, incidence, and outcomes. Hepatology. 2016. PubMed
- Rinella ME, et al. A multisociety Delphi consensus statement on new fatty liver disease nomenclature. Journal of Hepatology. 2023. PubMed
- Vilar-Gomez E, et al. Weight loss through lifestyle modification significantly reduces features of nonalcoholic steatohepatitis. Gastroenterology. 2015. PubMed
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