Every 4th person could be affected – many notice it only late

What is a fatty liver?

Fatty liver (steatosis hepatis) is a change in the liver where too much fat accumulates in liver cells. This disrupts the normal balance in the liver tissue.

A fatty liver develops when the liver can no longer process fat adequately. The fat, mainly in the form of triglycerides, is deposited in liver cells. As a result, the liver may be less efficient at certain tasks such as metabolising nutrients and producing bile for digestion. Often a fatty liver causes no symptoms for a long time and is discovered incidentally.

Three stages are usually distinguished. First there is a simple fatty liver without inflammation. Next, inflammation of the liver can develop, referred to as steatohepatitis. In later cases, the liver tissue can be severely damaged, up to liver cirrhosis.

A fatty liver typically develops gradually over a long period. Because it often remains unnoticed at first, it is frequently detected late.

What causes it?

A fatty liver occurs when fat accumulates in liver cells. Usually several factors act together. Diet, physical activity and metabolism play an important role.

An energy-dense diet with many highly processed foods and refined carbohydrates can lead to more fat being stored in the liver. Excessive alcohol consumption is also a central risk factor for fatty liver. Lack of exercise can further reduce energy expenditure and favour fat deposition.

The body mass index (BMI) is often used to assess weight status and is associated with fatty liver risk according to studies. However, BMI does not reflect body composition. It is not just weight that matters but the proportion of body fat. Visceral fat in the abdominal cavity is particularly important. This fat tissue is metabolically active and can promote inflammation and influence insulin sensitivity. This can increase the risk of fatty liver. People with a normal BMI can also have an elevated body fat percentage. In such cases, there may still be an increased risk of fatty liver.

In addition to these common causes, there are medical factors. These include certain medications such as corticosteroids or some chemotherapy agents that can affect liver metabolism. Diseases such as hepatitis C or other metabolic disorders can also be associated with fatty liver. Genetic factors may also play a role.

Less commonly, fatty liver can develop with malnutrition or protein deficiency. The risk can also be higher after digestive tract surgery or during pregnancy. Often no single cause can be identified, as multiple influences interact.

When does fatty liver become dangerous?

A fatty liver often remains unnoticed for a long time because it usually causes no symptoms in the early stage. It becomes dangerous mainly when liver inflammation develops.

At this stage, liver tissue can change and important metabolic functions may be impaired. If inflammation persists, the tissue can gradually scar (fibrosis). If this progresses to cirrhosis, the liver is heavily scarred and its function is significantly reduced.

As the disease advances, health risks increase. These particularly include cardiovascular diseases and metabolic disorders such as type 2 diabetes. In advanced stages, especially with cirrhosis, the risk of liver cancer may also be elevated.

Early evaluation can help to better assess the course of the disease and detect changes in time.

What symptoms occur?

A fatty liver usually causes no complaints in the early stage. It is therefore often discovered incidentally during an examination.

When symptoms occur, they are mostly non-specific. These include fatigue, concentration problems, nausea or loss of appetite. A feeling of pressure in the right upper abdomen may also occur. These complaints are not specific, as they can also occur in other conditions.

Blood tests are often normal in the early stage. Only when liver inflammation occurs can liver values rise. More severe symptoms may then appear. In rare cases a yellowing of the skin (jaundice) occurs. Metabolism can also be affected, leading to changes in blood sugar and blood lipid values.

If inflammation persists, liver tissue can change and gradually scar. This increasingly impairs liver function and over time a liver cirrhosis can develop. For this reason, fatty liver is often first detected by an ultrasound examination.

Which common mistakes worsen a fatty liver unnoticed?

Fatty liver is closely linked to dietary and lifestyle habits. A high intake of fructose can promote fat formation in the liver because it is metabolised there directly. Sweet drinks, fruit juices and smoothies often provide larger amounts of fructose. A frequent mistake is also the regular consumption of other sugary drinks such as sodas and energy drinks. These contain fast-acting sugars that can strongly affect metabolism. In addition, hidden sugar in processed products is often underestimated and can add up in everyday life.

Fat quality and eating behaviour also play a role. Highly processed foods and products containing trans fats can burden the liver. Frequent meals without longer breaks between eating can affect fat metabolism in the body. Regular alcohol consumption is also associated with increased fat deposition in the liver.

Other factors are very rapid weight loss or extreme diets, as these can lead to increased fatty acids reaching the liver. Certain high-dose dietary supplements can also further burden the liver. It is also important to note that fatty liver can occur not only in overweight individuals and that blood tests are often normal in the early stage, which is why it is frequently detected late.

Reversing fatty liver: which measures really help in everyday life?

• In many cases a fatty liver can regress through a targeted change in diet. A balanced, minimally processed diet with fewer highly processed carbohydrates is particularly important. Often this adjustment alone is enough to significantly reduce fat deposits in the liver.
• Alcohol can further burden the liver's fat metabolism. Complete abstinence or a strong reduction can therefore be an important step to reverse fatty liver and relieve liver function.
• Low-carb approach: a diet with fewer rapidly available carbohydrates can help reduce fat accumulation in the liver. Sweet drinks, white flour products and highly processed foods should be reduced.
• A sufficient protein intake can usefully complement the diet. Studies suggest that certain protein sources can positively influence fat deposits in the liver.
• Prefer foods with a low glycaemic index. Foods that raise blood sugar slowly can stabilise metabolism. These include legumes, whole grain products, nuts and seeds.
• Omega-3 fatty acids from fish, nuts or flaxseed can support fat metabolism. They help the body to utilise energy better.
• Dietary fibre supports a healthy gut flora and has a positive effect on metabolism. Legumes, vegetables and whole grains are particularly relevant. The prebiotic fibre inulin, found for example in many root vegetables, can help strengthen liver function. 
• Bitter foods such as chicory or artichokes can support digestion. They also promote satiety.
• Frequent snacks and sugar-rich foods can promote fat deposition in the liver. A conscious reduction in daily life can therefore be helpful.
• The liver needs recovery phases between meals. Eating too often without breaks can impair fat processing. Three structured meals with intervals can relieve metabolism.
• Intermittent fasting can help reduce body weight and stabilise metabolism. This forces the body to temporarily draw on stored energy reserves.
• A weight loss of about five to ten percent can already significantly relieve the liver. It is important that weight loss is sustainable and not too rapid.
• At least two and a half hours of moderate activity per week can support liver health. Simple activities such as brisk walking are already helpful.
• A mixed training programme combining endurance and strength exercises can be particularly effective. It supports energy expenditure and helps the body reduce fat stores.
• A fatty liver improves best through sustainable changes in daily life. Small, lasting adjustments are often more effective than strict short-term diets.

A fatty liver often develops quietly – and that is exactly what makes it so deceptive. All the more important to counteract early. Even small changes in diet, activity and indulgences can noticeably relieve the liver and reduce fat deposits in the tissue. Consistency in daily life matters more than perfection. Those who stick with it give the liver a chance to regenerate and regain balance. Step by step, a silent risk can become an active, healthy metabolism again.