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Fatty Liver Disease (MASLD): Symptoms, Causes, Stages, Diagnosis, Treatment & Prevention

Table of Contents

Introduction

Fatty liver disease is considered the most widespread form of liver disease in the world, as it affects millions of people because of increasing obesity, physical inactivity, insulin resistance, diabetes mellitus type 2, and many others. The problem arises from excessive accumulation of fat in the liver, which impairs the organ’s function. In the early stages of fatty liver disease, it usually goes unseen and returns without any symptoms, which makes routine tests and proper diagnosis very important. Untreated, the disease may progress from a very fatty accumulation through inflammation and fibrosis of the liver, then cirrhosis of the liver and its failure, and ultimately liver cancer. Luckily, with proper treatment and management, fatty liver disease can be prevented from developing further.

In this complete guide, you will learn what fatty liver disease is and what causes it. The blog will discuss how fatty liver disease develops, its symptoms and complications, how to diagnose it, and measures to prevent it through proper nutrition and lifestyle.

What Is Fatty Liver Disease?

Fatty liver disease is a condition in which excess fat builds up inside the liver cells. Some fat deposition in the liver is normal; however, excessive fat deposition may lead to liver inflammation and damage. If fatty liver disease results from metabolic factors, it is called metabolic dysfunction-associated steatosis liver disease (MASLD). MASLD is strongly associated with insulin resistance, overweight/obesity, and metabolic syndrome. However, it can also occur in lean individuals and is particularly common in those with a paucity of adipose tissue (ie., lipodystrophy).

Why Is Fatty Liver Disease Now Called MASLD?

The proposed new terminology is metabolic dysfunction-associated steatosis liver disease (MASLD) to replace NAFLD, and metabolic dysfunction-associated steatohepatitis (MASH) to replace nonalcoholic steatohepatitis. The new term highlights the strong relationship between fatty liver disease and metabolic dysfunction, including obesity, insulin resistance, type 2 diabetes, and dyslipidemia.

How Does the Liver Work?

  • Liver functions include metabolism, digestion, detoxification, and energy storage. It is where nutrients from food are processed, blood glucose levels are regulated, bile is produced, insulin resistance, often associated with obesity, diabetes, or other metabolic problems, and toxic substances are cleared from the body.
  • When the body develops, the liver may start taking up and producing more fat than it can break down or export. This causes triglycerides to accumulate inside liver cells, leading to fatty liver.
  • In some people, excess fat can trigger oxidative stress, inflammation, and liver cell injury. This may lead to liver scarring in the form of fibrosis, and further development into cirrhosis and eventually liver cancer.

Types of Fatty Liver Disease

  • Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD):
  • It is the most common type and is associated with obesity, insulin resistance, diabetes mellitus type 2, and hypertension
  • Metabolic Dysfunction-Associated Steatohepatitis (MASH):
  • When MASLD becomes severe, it leads to MASH. In this type, excess liver fat is accompanied by inflammation and liver cell injury. Continued damage to the liver can lead to fibrosis and cirrhosis.
  • Metabolic Dysfunction- and Alcohol-Associated Liver Disease (MetALD):
  • When metabolic dysfunction and alcohol consumption can be observed simultaneously, it is known as MetALD. 
  • Alcohol Associated Liver Disease (ALD):
  • It occurs due to excessive or prolonged alcohol consumption. Can lead to alcohol associated hepatitis and cirrhosis

How Common Is Fatty Liver Disease?

  • Non-alcoholic fatty liver disease (MASLD) is the most common cause of chronic liver disease worldwide. The global prevalence of MASLD is estimated at up to 1 billion.

What Causes Fatty Liver Disease?

  • Fat accumulation in the liver causes fatty liver disease, which can happen due to the following reasons:
  • High fat levels in blood (due to dietary intake)
  • Obesity
  • Type 2 Diabetes mellitus
  • Heavy alcohol use
  • Genetic conditions
  • Adverse effects of medications

Early Symptoms of Fatty Liver Disease

  • Most people with fatty liver disease have no noticeable symptoms, especially in the early stages. It is often discovered incidentally during routine blood tests or imaging performed for another health concern.
  • When symptoms do occur, they may include:
  • Fatigue or low energy
  • Vague discomfort or pain in the upper right side of the abdomen
  • Enlarged liver (hepatomegaly), which may be detected during a physical examination
  • Abnormal liver enzymes found during routine blood tests

Advanced Symptoms

  • As fatty liver disease progresses to significant fibrosis or cirrhosis, symptoms may become more noticeable. These can include:
  • Jaundice (yellowing of the skin and eyes)
  • Abdominal swelling due to ascites
  • Enlarged spleen (splenomegaly)
  • Spider angiomas and redness of the palms (palmar erythema)
  • Bleeding from enlarged veins (variceal bleeding) in advanced portal hypertension
  • Other complications related to advanced liver disease or liver failure

Fatty Liver Disease Stages

stages of Fatty

How Is Fatty Liver Disease Diagnosed?

Diagnosing fatty liver disease, now commonly referred to as metabolic dysfunction-associated steatotic liver disease (MASLD) when metabolic risk factors are present, involves two key steps: confirming the presence of excess fat in the liver and assessing whether the liver has inflammation or fibrosis (scarring).

There is no single blood test that can diagnose fatty liver disease or reliably determine its severity. Diagnosis usually involves a combination of medical history, physical examination, blood tests, imaging, and, in selected cases, liver biopsy.

Disease Diagnosed

Medifyhome can simplify the process of conducting an initial assessment and monitoring of fatty liver through at-home blood tests. Blood tests for Liver Function Tests (LFT), ALT, AST, bilirubin, albumin, CBC/platelets, fasting glucose, HbA1c, and lipid profile could be considered.

Can Fatty Liver Disease Be Reversed?

Lifestyle modification is the option of MASLD. The main goals are to reduce excess body weight, improve insulin sensitivity, decrease liver fat, and prevent progression to steatohepatitis and liver fibrosis.

Best Diet for Fatty Liver Disease

Foods to Eat: A Mediterranean-style diet is a good dietary pattern for people with fatty liver disease. Focus on foods that support healthy weight management and improve metabolic health:

  • Vegetables: Greens, broccoli, cauliflower, tomatoes, carrots, and other non-starchy vegetables
  • Fruits: Fresh fruits in moderation, rather than fruit juices
  • Grains: Oats, brown rice, whole grain products, and other minimally processed grains
  • Legumes: Lentils, beans, chickpeas, and peas
  • Healthy fats: Nuts, seeds, avocados, and unsaturated vegetable oils, including olive oil
  • High-protein foods: Fish, particularly fatty fish, skinless poultry, eggs, and vegetarian protein sources
  • Low-fat dairy: Milk, yogurt, and other dairy products, which are not sweetened
  • Coffee: Consumption of regular coffee has been found to correlate with a reduced incidence of liver fibrosis in certain research; unsweetened coffee is recommended if well-tolerated

In general, the emphasis should be on nutrient-dense, minimally processed foods, while maintaining proper caloric intake. It appears that the benefits of various dietary approaches, such as low-carbohydrate or low-fat diets, are mainly due to reduced caloric intake.

Foods to Avoid: Certain foods and beverages can contribute to weight gain, insulin resistance, and worsening liver fat and should be limited:

  • Sugary drinks: soft drinks, energy drinks, sweetened juices, and other beverages high in added sugar
  • Foods high in added fructose: Particularly products containing large amounts of high-fructose sweeteners
  • Refined carbohydrates: White bread, pastries, cakes, biscuits, and other highly processed carbohydrate-rich foods
  • Highly processed foods: Packaged snacks, fast food, and ultra-processed meals
  • Foods high in saturated and trans fats: Fatty or processed meats, deep-fried foods, and certain commercially baked products
  • Excess added sugar: Sweets, desserts, and sugary snacks
  • Excess calories: Overeating, regardless of the specific macronutrient composition, can make weight management more difficult

Lifestyle Changes That Improve Liver Health

  • Exercise recommendations: Regular physical activity helps reduce liver fat and improve insulin sensitivity, even without significant weight loss. Both aerobic exercise and resistance training can effectively reduce liver fat. Try to spend at least 30 minutes, 5 days a week, doing aerobic exercise or resistance training. Exercise activities should align with individual interests and capabilities to be sustained over the long term. Even a slight increase in physical activity is better than its absence.
  • Weight management – Weight management is a key component of fatty liver treatment. About 3–5% weight loss helps reduce liver steatosis; however, 7- 10% weight loss or more can improve steatohepatitis and even liver fibrosis. The importance lies in the gradual, maintainable loss of weight.
  • Sleep management – Good sleep positively affects the body’s metabolic processes and can help with weight loss. It is necessary to try to maintain a consistent bedtime and wake-up time and get enough sleep at night.
  • Stress reduction – Chronic stress can make it harder to maintain healthy eating and exercise habits. It is recommended to use stress-reduction methods such as practicing mindfulness or meditation, doing yoga, practicing breathing exercises, using relaxation techniques, or engaging in physical activity.
  • Hydration: Try to drink enough water throughout the day. Instead of sugary, sweet, or fructose-rich drinks, it is better to drink water.
  • Smoking cessation – It is recommended that people suffering from fatty liver disease give up smoking, since this will help in maintaining general cardiovascular and metabolic health. In particular, it is crucial due to the fact that fatty liver disease is frequently connected with obesity and diabetes.
  • Alcohol avoidance – Alcohol intake is one more risk factor for liver damage and fatty liver disease development. People with fatty liver disease, especially with steatohepatitis and liver fibrosis, should avoid alcohol consumption.

Fatty Liver Disease in Special Groups

  • Children – Fatty liver in children has been increasingly due to obesity and unhealthy diet. Family history of MASLD and type 2 diabetes increases the likelihood of having fatty liver as a child. Regular exercise and avoiding highly processed foods help ensure children are free from fatty liver. Never put children on any restrictive diets without discussing it with a paediatrician or dietician first.
  • Teenagers – The most common cause of being diagnosed with MASLD in this age group is hormonal changes, which can lead to PCOS in teenage girls. Being physically inactive and eating fast food increases the risk of having MASLD. Maintaining a healthy body weight is crucial.
  • Women – The risk of developing MASLD can vary by age. After menopause, estrogen levels decline; this is associated with increased risk of MASLD.

Why is it especially important for women?

Having MASLD could make women more likely to develop:

  • Heart disease
  • Gestational diabetes during pregnancy
  • Presentation of liver disease if metabolic risks remain untreated

Therefore, regular checkups and metabolic tests are essential.

Pregnancy – Women with MASLD or significant metabolic risk factors should receive adequate prenatal care. Pregnant women with MASLD have a higher risk of developing gestational diabetes, premature birth, and pregnancy-induced hypertension.

Complications If Left Untreated

  • Steatohepatitis (MASH): Persistent fat accumulation can lead to inflammation and liver cell injury.
  • Liver fibrosis: Repeated inflammation can cause scar tissue to build up in the liver.
  • Cirrhosis: Advanced fibrosis can permanently damage the liver and impair its ability to function normally.
  • Liver failure: Severe cirrhosis can eventually lead to loss of liver function.
  • Liver cancer: People with advanced fibrosis or cirrhosis have an increased risk of developing hepatocellular carcinoma.
  • Portal hypertension: Scarring can increase pressure in the liver’s blood vessels, potentially causing complications such as enlarged veins (varices), ascites, and an enlarged spleen.
  • Cardiovascular disease: Metabolic fatty liver disease is strongly associated with cardiovascular risk factors, and cardiovascular disease is an important cause of illness and death in these patients.
  • Type 2 diabetes and metabolic syndrome: Fatty liver disease is closely linked with insulin resistance and may coexist with or increase the risk of metabolic conditions.

Myths and Facts About Fatty Liver Disease

MYTH: Fatty liver disease only affects people who drink alcohol.

Fact: Fatty liver can occur in people who drink or don’t drink alcohol.

MYTH: Fatty liver is harmless and never progresses.

Fact: Fatty liver can cause many serious health complications if left ignored and untreated

MYTH: Only people with obesity can develop fatty liver.

Fact: Lean or normal weight individuals can also develop fatty liver, but obesity can increase the risk.

How to Prevent Fatty Liver Disease

Fatty liver disease can be prevented by eating a balanced diet and maintaining a healthy weight through regular exercise. Alcohol must be avoided or limited. It is important always to stay hydrated and get adequate sleep. Regular health checkups should be done for people with obesity, diabetes, metabolic syndrome, or any other risk factors.

When Should You See a doctor?

Some situations where you should consider visiting a physician include:

  • You have chronic fatigue.
  • You feel uncomfortable pain or discomfort in the upper right part of your abdomen.
  • You suffer from obesity, type 2 diabetes, insulin resistance, high cholesterol levels, or high triglycerides.
  • You suffer from hypertension or metabolic syndrome.
  • You suffer from unusual ALT, AST, or liver test results.
  • You have been informed that the imaging test shows fatty liver.
  • You are a frequent consumer of alcohol or worry about alcohol-induced liver injury.
  • You have a family history of liver disease or other risk factors for liver disease.

Recommended Health Tests for People at Risk

Tests that are frequently suggested include:

  • Liver Function Test (LFT): Tests such as ALT, AST, bilirubin, albumin, and ALP are performed to evaluate liver function and diagnose potential liver damage.
  • Fasting Blood Glucose: Detects high blood sugar and risk of diabetes.
  • HbA1c: Assesses average blood glucose levels over the last 2-3 months and diagnoses diabetes.
  • Lipid Profile: Measures the level of cholesterol and triglycerides, which are key metabolic factors for developing fatty liver disease.
  • Complete Blood Count (CBC): Measures platelet levels, which can be helpful when assessing the risk of developing severe liver fibrosis.
  • FIB-4 score: Non-invasive fibrosis score that is assessed based on age, AST, ALT, and platelet levels. Can help detect at-risk patients.
  • Abdominal Ultrasound: First-line imaging test to detect excess liver fat.
  • Fibro Scan (Transient Elastography): Non-invasive method to test liver stiffness.

Medifyhome can assist with testing blood parameters, including LFT, HbA1c, fasting blood glucose, lipid profile, and CBC, through diagnostic services. Additional evaluations, such as ultrasound and FibroScan, will depend on the patient’s risk factors and should be advised by a healthcare professional.

Frequently Asked Questions

For many people, fatty liver is treatable and reversible, especially in its early stages, with weight management, proper nutrition, physical activity, and other interventions aimed at controlling related diseases.

Yes, fatty liver can happen to someone who is not overweight. Skinny MASLD can be caused by insulin resistance, type 2 diabetes, abnormal blood lipids, or other metabolic risk factors.

Yes, excess alcohol intake can lead to alcohol-associated liver disease (ALD). Metabolic risk factors and alcohol together can cause fatty liver, known as MetALD.

No, not all fats are bad for your health. It is important to decrease intake of saturated and trans fats while increasing intake of unsaturated fats.

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