Metabolic dysfunction–associated steatotic liver disease

Parts of this article (those related to the new 2023 nomenclature and classification) need to be updated. Please help update this article to reflect recent events or newly available information. (November 2023)

Metabolic dysfunction–associated steatotic liver disease
Other names	MASLD, Non-alcoholic fatty liver disease (NAFLD),[1] Metabolic (dysfunction) associated fatty liver disease, MAFLD[2]
Stages of metabolic dysfunction–associated steatotic liver disease, progressing from healthy, to steatosis (fat accumulation), inflammation, fibrosis and cirrhosis.
Specialty	Hepatology
Symptoms	Asymptomatic in the early stages In later stages: * Deposits of cholesterol on the eye lids * Fatigue * Crusty red nodules * Digestive issues Lastly causes liver disease and eventually liver failure
Complications	Cirrhosis, liver cancer, liver failure, cardiovascular disease[3][4]
Duration	Long term
Types	Metabolic dysfunction–associated steatotic liver (MASL), Metabolic dysfunction-associated steatohepatitis (MASH)[4][5]
Causes	Genetic, environmental
Risk factors	Obesity, metabolic syndrome, type 2 diabetes mellitus, liver disease
Diagnostic method	Ultrasound, Coexisting metabolic disorders, Liver biopsy
Treatment	Weight loss (in case of obesity) Dietary reduction of fructose and glucose[6] (diet and exercise)[4][7]
Prognosis	Depends on type[8]
Frequency	24% in worldwide population, 80% in obese, 20% in normal-weight
Deaths	MASH: 2.6% risk of death per year[5] MAFL: Unknown[9]

Metabolic dysfunction–associated steatotic liver disease (MASLD) is the name adopted in 2023 for the condition previously known as non-alcoholic fatty liver disease (NAFLD).^[a] This condition is diagnosed when there is excessive fat build-up in the liver (hepatic steatosis), and at least one metabolic risk factor.^[1][3][4] When there is also moderate alcohol use, the term MetALD is used, and these are differentiated from alcoholic liver disease (ALD) when this is the sole cause of steatotic liver disease.^[1][12] The terms non-alcoholic fatty liver (NAFL) and non-alcoholic steatohepatitis (NASH, now MASH) have been used to describe different severities, the latter indicating the presence of further liver inflammation.^[4][5][8] NAFL is less dangerous than NASH and usually does not progress to it,^[4] but this progression may eventually lead to complications, such as cirrhosis, liver cancer, liver failure, and cardiovascular disease.^[4][13]

Obesity and type 2 diabetes are strong risk factors for MASLD.^[7] Other risks include being overweight, metabolic syndrome (defined as at least three of the five following medical conditions: abdominal obesity, high blood pressure, high blood sugar, high serum triglycerides, and low serum HDL cholesterol), a diet high in fructose, and older age.^[4][8] Obtaining a sample of the liver after excluding other potential causes of fatty liver can confirm the diagnosis.^[3][7][8]

Treatment for MASLD is

MASLD is the most common liver disorder in the world; about 25% of people have it.[19] It is very common in developed nations, such as the United States, and affected about 75 to 100 million Americans in 2017.^{[20][21][22][23]} Over 90% of obese, 60% of diabetic, and up to 20% of normal-weight people develop MASLD.^[24][25] MASLD was the leading cause of chronic liver disease^[23][24] and the second most common reason for liver transplantation in the United States and Europe in 2017.^[14] MASLD affects about 20 to 25% of people in Europe.^[16] In the United States, estimates suggest that 30% to 40% of adults have MASLD, and about 3% to 12% of adults have MASH.^[4] The annual economic burden was about US$103 billion in the United States in 2016.^[24]

Definition

An abnormal accumulation of fat in the liver in the absence of secondary causes of fatty liver, such as significant alcohol use, viral hepatitis, or medications that can induce fatty liver, was the definition of NAFLD.^[19] However, the term MASLD accepts there may be other conditions present, but focuses on the metabolic abnormalities contributing to the disorder.^[1][12] MASLD encompasses a continuum of liver abnormalities, from metabolic dysfunction–associated steatotic liver (MASL, simple steatosis) to Metabolic dysfunction-associated steatohepatitis (MASH). These diseases begin with fatty accumulation in the liver (hepatic steatosis). A liver can remain fatty without disturbing liver function (MASL), but by various mechanisms and possible insults to the liver, it may also progress into steatohepatitis (MASH), a state in which steatosis is combined with inflammation and sometimes fibrosis.^[1] MASH can then lead to complications such as cirrhosis and hepatocellular carcinoma.^[3][5][26]

The new name, metabolic dysfunction-associated steatotic liver disease (MASLD), was proposed after 70% of a panel of experts expressed support for this name.^[1] This new name was adopted in 2023.^[1][10]

Signs and symptoms

People with MASLD often have no noticeable symptoms, and it is often only detected during routine blood tests or unrelated abdominal imaging or liver biopsy.^[5][26] In some cases, it can cause symptoms related to liver dysfunction such as fatigue, malaise, and dull right-upper-quadrant abdominal discomfort. Mild yellow discoloration of the skin may occur, although this is rare.^[27] MASH can severely impair liver function, leading to cirrhosis, liver failure, and liver cancer.^[5]

Comorbidities

The condition is strongly associated with or caused by type 2 diabetes, insulin resistance, and metabolic syndrome (defined as at least three of the five following medical conditions: abdominal obesity, high blood pressure, high blood sugar, high serum triglycerides, and low serum high-density lipoprotein). It is also associated with

Most normal-weight people with MAFLD ("lean MAFLD") have impaired insulin sensitivity, are sedentary, and have increased cardiovascular disease risk and increased liver lipid levels. These are the consequences of a decreased capacity for storing fat and reduced mitochondrial function in fat and increased hepatic de novo lipogenesis.^[7][24] A recent systematic review reported an increased risk of severe COVID-19 infection in MAFLD patients, but no difference in mortality was observed between MAFLD and non-MAFLD patients.^[30]

Risk factors

Genetics

Two-thirds of families with a history of diabetes type 2 report more than one family member having MASLD. There is a higher risk of fibrosis for family members where someone was diagnosed with MASH.^[26] Asian populations are more susceptible to metabolic syndrome and MASLD than their western counterparts.^[7] Hispanic persons have a higher prevalence of MASLD than white individuals, whereas the lowest prevalence is observed in black individuals.^[24] MASLD is twice as prevalent in men as in women,^[5] which might be explained by lower levels of estrogen in men.^[31]

According to the Asia-Pacific Working Group (APWG) on MASLD, overnutrition is a major factor of MASLD and MASH, particularly for lean MAFLD.[7] Diet composition and quantity, in particular omega-6 fatty acid and fructose, have important roles in disease progression from MASL to MASH and fibrosis.^[33][34] Choline deficiency can lead to the development of MASLD.^[35]

Higher consumption of

Habitual snoring may be a risk factor for MAFLD. Severe snoring often signals the presence of obstructive sleep apnea (OSAS), a much more serious breathing condition. Blockage or narrowing of the airways, even temporarily, can cause the body to experience lowered oxygen levels in the blood. This in turn may cause a variety of changes within the body such as tissue inflammation, increased insulin resistance, and liver injury.^[45] A prospective cohort study found the association between habitual snoring and MASLD development to be significant, and the trend was noted to be most prominent in lean individuals.^[46]

Pathophysiology

The primary characteristic of MASLD is the accumulation of lipids in the liver, largely in the form of

One debated mechanism proposes that hepatic steatosis progresses to steatosis with inflammation following some further injury, or second hit. Oxidative stress, hormonal imbalances, and mitochondrial abnormalities are potential causes of this "second hit" phenomenon.^[26] A further nutrigenomics model named multiple hit extends the second hit model, suggesting that multiple disease biomarkers and factors such as genes and nutrition influence NAFLD and NASH progression. This model attempts to use these factors to predict the impact of lifestyle changes and genetics for the evolution of the NAFLD pathology.^[49] Many researchers describe NAFLD as a multisystem disease, as it impacts and is influenced by organs and regulatory pathways other than the liver.^[50][51][52]

The accumulation of senescent cells in the liver is seen in persons with NAFLD.^[53] In mice, liver senescent hepatocytes result in increased liver fat deposition.^[53] Treatment of NAFLD mice with senolytic agents has been shown to reduce hepatic steatosis.^[53]

Based on gene knockout studies in murine models, it has been suggested that, among many other pathogenic factors, TGF beta signals may be crucially involved in promoting the progression of NASH.^[54]

Fructose consumption

Non-alcoholic and alcoholic fatty liver disease share similar histological features, which suggests that they might share common pathogenic pathways. Fructose can cause liver inflammation and addiction similarly to ethanol by using similar metabolic pathways, unlike glucose. Therefore, some researchers argue that non-alcoholic and alcoholic fatty liver diseases are more alike than previously thought.

Excessive macronutrient intake contributes to gut inflammation and perturbation of homeostasis, and micronutrients may also be involved.[60] In addition to reducing weight and risk factors, lifestyle changes may prompt positive changes in the gut microbiota.^[61] In particular, diet diversity may play a role that was overlooked in animal studies, since they often compare a Western high-fat, low-diversity diet against a low-fat but higher-diversity chow.^[62] The health benefits after bariatric surgery may also involve changes in the gut microbiota by increasing gut permeability.^[62]

• 
  Mallory-Denk body
• 
  Ballooning degeneration
• 
  NASH (inflammation) and fibrosis stage 1
• 
  NASH (inflammation) and fibrosis stage 2
• 
  Lobular inflammation

Diagnosis

NAFLD is defined by the presence of excess fat in the liver that cannot be explained by another factor, such as excessive alcohol use (>21 standard drinks/week for men and >14 for women in the USA; >30 g daily for men and >20 g for women in UK and EU, >140 g/week for men and >70 g/week for women in Asia-Pacific), liver injury caused by drugs or toxins or viruses, nutritional deficiency, or endocrine conditions. In practice, diagnosis is often made simply based on the clinical presentation and a lack of high-volume alcohol consumption reported by the patient, but this is an unreliable method of diagnosis and should be confirmed with other methods whenever possible.^{[3][5][7][63][16][64]}

NAFLD comprises two histological categories: NAFL, and the more aggressive form NASH. The presence of at least 5% fatty liver is common to both NAFL and NASH, but the features of substantial lobular inflammation and hepatocyte injuries such as ballooning or Mallory hyaline only occur in NASH. The majority of NAFL cases show minimal or no inflammation.^[3][5][7] Pericentral and perisinusoidal fibrosis occur more often in adult-onset NASH, whereas portal fibrosis is more common in children with the disorder. NASH represents a more advanced stage of NAFL and is associated with poor outcomes such as cardiovascular events, cirrhosis, or hepatocellular carcinoma. ICD-11 does not use the term NAFL as it was deemed confusing with the family of disorders NAFLD. The preferred descriptions are instead: MAFLD without NASH or simple steatosis and "NASH". Also, the modifier with or without fibrosis or cirrhosis completes the diagnostic description.^[3][7]

Blood tests

Liver function tests may be abnormal, but they often remain within the normal range even in advanced disease.^[13][63][24] Other blood tests that may be useful to confirm the diagnosis include erythrocyte sedimentation rate, serum glucose, and albumin. Because the liver is important for making proteins used in blood clotting, coagulation-related studies are often carried out, especially the prothrombin time. In people with fatty liver with associated inflammatory injury (steatohepatitis) blood tests are usually used to rule out certain types of viral hepatitis and autoimmune diseases. Low thyroid activity is more prevalent in people with NASH, which would be detected by determining the thyroid-stimulating hormone.^[65] Some biomarker-based blood tests have been developed and may be useful for diagnosis.^[66]

Although blood tests cannot diagnose MAFLD, circulating serum biomarkers of liver fibrosis can give moderate estimates in the diagnosis of liver fibrosis and cirrhosis. The ratio of the

A liver ultrasound scan or magnetic resonance imaging (MRI) can diagnose steatosis,^[70] but not fibrosis and confirmation of early cirrhosis detection by ultrasound by other diagnostic methods is recommended.^[67] The European Association for the Study of the Liver (EASL) recommends screening for steatosis whenever NAFLD is suspected as this is a strong predictor of the disease evolution and predicts future type 2 diabetes, cardiovascular events, and hypertension.^[16] These non-invasive methods can be used for NAFLD screening but are not accepted as a substitute for liver biopsy in NAFLD nor NASH clinical trials, as only a liver biopsy can define liver pathology.^[7][14]

Ultrasound presented average sensitivity and specificity for diagnosing the disease in children, while in the adult population, sensitivity and specificity were significantly higher. Proton density fat fraction magnetic resonance imaging has been increasingly used for the diagnosis of steatosis in pediatric patients.^{[citation needed]}

Ultrasound elastography is an effective tool for staging liver fibrosis and discriminating NASH from MAFLD in children.^[71]

Magnetic resonance elastography (MRE) is an established method that can accurately assess hepatic fibrosis and is recommended by the APASL, AGA, ACR and AASLD.^[67] MRE possesses excellent accuracy to detect fibrosis in NAFLD regardless of BMI and inflammation, and is suggested as a more reliable alternative to diagnose NAFLD and its progression to NASH compared to ultrasound and blood tests.^{[27][32][72][73]}

Liver biopsy

A

There are several liver biopsy techniques available to obtain liver tissue. Percutaneous liver biopsy remains the most common practice. Biopsies can also be performed via the transvenous route, either during surgery or by laparoscopy, especially for people with contraindications to a percutaneous approach. The liver biopsy can also be image-guided, in real-time or not, which is recommended for some clinical situations such as people with known intra-hepatic lesions, previous intra-abdominal surgery who may have adhesions, a small liver that is difficult to percuss, obese people and people with evident ascites. Vital signs must be monitored frequently afterward (at least every 15 minutes in the hour following the biopsy).^[67]

According to AASLD guidelines, a liver biopsy may be considered in people with NAFLD who are at increased risk of having steatohepatitis with or without advanced fibrosis, but only when all other competing chronic liver diseases are excluded (such as alcoholic liver disease). The presence of metabolic syndrome, NAFLD Fibrosis Score (FIB-4), or liver stiffness (as measured by Vibration-controlled transient elastography or MRE) can identify the individuals who are at higher risk of steatohepatitis or advanced fibrosis.^[5]

The AASLD and ICD-11 consider that clinically useful pathology reporting distinguishes "between NAFL (steatosis), NAFL with inflammation and NASH (steatosis with lobular and portal inflammation and hepatocellular ballooning)" with the presence or absence of fibrosis being described and optionally comment on severity.^[5][7] The EASL recommends the Fatty Liver Inhibition of Progression (FLIP) algorithm to grade the ballooning and classify MAFLD-associated liver injury, and the use of the NAFLD Activity Score (NAS) to grade the severity of NASH rather than for its diagnosis. They also consider the steatosis, activity, and fibrosis (SAF) score to be an accurate and reproducible scoring system.^[16] The AASLD recommends the use of the NAS scoring system with or without the SAF score if deemed appropriate.^[5] The Asia-Pacific Working Group on MAFLD disadvises the use of NAS, as it is considered uninformative for NAFLD and inappropriate to diagnose NASH.^[14]

For liver fibrosis assessment, percutaneous liver biopsy, with or without image guidance, is contraindicated in uncooperative people.^[67] Transjugular liver biopsy is indicated for any person with diffuse liver disease who needs a biopsy but has a contraindication to percutaneous biopsy or needs a hemodynamic evaluation for diagnostic purposes. A transvenous liver biopsy is recommended instead of a percutaneous approach in people with clinically evident ascites, although percutaneous biopsy is an acceptable alternative approach after the removal of ascites.^[67]

Management

NAFLD warrants treatment regardless of whether the affected person is overweight or not.^[7] MAFLD is a preventable cause of death.^[23] Guidelines are available from the American Association for the Study of Liver Diseases (AASLD), American Association of Clinical Endocrinologists (AACE) National Institute for Health and Care Excellence (NICE), the European Association for the Study of the Liver (EASL), and the Asia-Pacific Working Party on NAFLD.^{[5][7][14][63][16][75][76]}

Lifestyle

Weight loss is the most effective treatment for NAFLD. A loss of 4% to 10% body weight is recommended, with 10% to 40% weight loss completely reversing NASH without cirrhosis. A structured weight loss program helps people with MAFLD lose more weight compared with advice alone. This type of program also leads to improvements in NAFLD measured using blood tests, ultrasound, imaging, or liver biopsies. Although fibrosis improves with lifestyle interventions and weight loss, there is limited evidence for cirrhosis improvement.^{[7][14][75][77]}

A combination of improved diet and exercise, rather than either alone, appears to best help manage NAFLD and reduce insulin resistance.^{[5][15][16][78][79]} Motivational support, such as with cognitive behavioral therapy, is helpful, as most people with MAFLD do not perceive their condition as a disease, and thus have a low motivation to change.^{[5][13][63][16][47]}

Higher-intensity behavioral weight loss therapies (diet and exercise combined) may produce more weight loss than lower-intensity ones. A 2019 systematic review suggested a change of guidelines to recommend these therapies for MAFLD management. Weight loss is associated with improvements in biomarkers, MAFLD grade, and reduced chances of NASH, but its effect on long-term health was not known.^[77]

2021 meta-analyses of trials over periods of 1 to 28 months found limited evidence to indicate that lifestyle modifications and nutritional supplementation have an effect on mortality, liver cirrhosis, liver decompensation, liver transplantation, and hepatocellular carcinoma in people with non-alcohol-related fatty liver disease; authors said that it was unlikely that differences in clinical outcomes would become apparent in trials with less than 5 years to 10 years of follow‐up, and that sample sizes needed to be much larger than had been used.^[80][81]

Diet

Treatment of NAFLD typically involves

The EASL recommends energy restriction of 500–1000 kcal per week less than the normal daily diet, a target of 7–10% weight loss for obese/overweight MAFLD, a low- to moderate-fat, and moderate- to high-carbohydrate diet, or a low-carbohydrate ketogenic or high-protein diet such as the Mediterranean diet, and avoiding all beverages and food containing fructose.^[16]

Alcohol is an aggravating factor, and the AASLD recommends that people with NAFLD or NASH avoid alcohol consumption.^{[5][13][63][86]} The EASL allows alcohol consumption below 30g/day for men and 20g/day for women.^[16] The role of coffee consumption for NAFLD treatment is unclear though some studies indicate that regular coffee consumption may have protective effects.^[16][87][88]

Herbal compounds such as

Vitamin E does not improve established liver fibrosis in those with MAFLD but seems to improve certain markers of liver function and reduces inflammation and fattiness of the liver in some people with MAFLD.^[5][13][63] The Asia-Pacific Work Group advises that Vitamin E may improve liver condition and aminotransferase levels, but only in adults without diabetes or cirrhosis who have NASH.^[14] The NICE guidelines recommend Vitamin E as an option for children and adults with NAFLD with advanced liver fibrosis, regardless of whether the person has diabetes mellitus.^[13][63]

Physical activity

Weight loss may improve MAFLD and is recommended particularly for obese or overweight people;^[93][94][95] similar physical activities and diets are advisable for overweight people with MAFLD as for other obese and overweight people.^[63][79] Although physical activity is less important for weight loss than dietary adaptations (to reduce caloric intake),^[47] the NICE advises physical activity to reduce liver fat even if there is no overall bodyweight reduction.^[13][63] Weight loss, through exercise or diet, is the most effective way to reduce liver fat and help NASH and fibrosis remission.^[47] Exercise alone can prevent or reduce hepatic steatosis, but it remains unknown whether it can improve all other aspects of the liver; hence a combined approach with diet and exercise is advised.^[5][15] Aerobic exercise may be more effective than resistance training, although there are contradictory results.^[13][96] Vigorous training is preferable to moderate training, as only the high-intensity exercise reduced the chances of MAFLD developing into NASH or advanced fibrosis.^[13][97] The EASL recommends between 150 and 200 min/week in 3 to 5 sessions of moderate-intensity aerobic physical activity or resistance training. Since both effectively reduce liver fat, a pragmatic approach to the choice of physical activity that accounts for the individual's preferences for what they can maintain in the long-term is preferred. Any engagement in physical activity or increase over previous levels is better than remaining sedentary.^[16]

Medication

While many treatments appear to improve biochemical markers such as

Statin medications appear to improve liver histology and markers of liver biochemistry in people with MAFLD. Since people with NAFLD are at a higher risk of cardiovascular disease, statin treatment is indicated. People with NAFLD are not at higher risk for serious liver injury from statins, according to AASLD and EASL. However, even if statins are safe to use in people with NASH cirrhosis, the AASLD suggests avoiding them in people with decompensated cirrhosis.^[5][16][101] Guidelines recommend statins to treat dyslipidemia for people with MAFLD. According to NICE guidelines, statins can continue unless liver enzyme levels double within three months of starting statins.^[63] Treatment with pentoxifylline is not recommended.^[14]

Omega-3 fatty acids may reduce liver fat and improve blood lipid profile but do not seem to improve liver histology (fibrosis, cirrhosis, cancer).^[14] The NICE does not recommend omega-3 fatty acid supplementation since randomized trials were inconclusive.^[13][63] Previous systematic reviews found that omega-3 fatty acid supplementation in those with MAFLD/NASH using doses of one gram daily or more (median dose four grams/day with median treatment duration six months) has been associated with improvements in liver fat.^[47][102] According to AASLD guidelines, "omega-3 fatty acids should not be used as a specific treatment of NAFLD or NASH, but they may be considered to treat hypertriglyceridemia for patients with NAFLD".^[5]

Resmetirom (Rezdiffra) was approved for medical use in the United States in March 2024 for the treatment of noncirrhotic nonalcoholic steatohepatitis.^[103][104]

Aspirin, 81 mg for 6 months, significantly reduced hepatic fat quantity compared with placebo among 40 randomized participants with MASLD in a 6-month, phase 2, randomized, double-blind clinical trial conducted at a single hospital in Boston, Massachusetts. ^[105]

Surgery

Bariatric surgery is an effective method for obese and diabetic individuals with MAFLD to induce weight loss and reduce or resolve NASH inflammation, including fibrosis, and improve longevity.^{[13][14][16][47][106][107]} For the AASLD, bariatric surgery can be considered only for NASH on a case-by-case basis by an experienced bariatric surgery program.^[5] Indeed, some individuals might develop new or worsened features of MAFLD.^[107]

About 92% of people with MAFLD saw an improvement in steatosis and 70% a complete resolution after bariatric surgery.^[108]

A preoperative diet such as a low-calorie diet or a very-low-calorie diet is usually recommended to reduce liver volume by 16–20%. Preoperative weight loss is the only factor associated with postoperative weight loss.^[109][110] Preoperative weight loss can reduce operative time and hospital stay,^{[109][111][112]} although there is insufficient evidence whether preoperative weight loss reduces long-term morbidity or complications.^[112][113] Weight loss and decreases in liver size may be independent of the amount of calorie restriction.^[110]

The APWG on MAFLD recommends bariatric surgery as a treatment option for those with class II obesity (BMI >32.5 kg/m² for Asians, 35 kg/m² for Caucasians). They consider its effects on improving liver-related complications as unproven yet, but it effectively increases longevity by improving cardiovascular factors.^[14]

Surgery carries more risks for individuals with NASH cirrhosis, with a review estimating overall morbidity to be 21%. For people with MAFLD who have undifferentiated cirrhosis, the APWG recommends an investigation to determine the cause of the cirrhosis as well as the person's liver function and whether they have portal hypertension.^[14]

Screening

Cardiovascular system screening is considered mandatory by the EASL, as MAFLD outcomes often result in cardiovascular complications,^[16] which can manifest as subclinical atherosclerosis, the cause of the majority of MAFLD-related deaths.^[50][114] People with MAFLD are at high risk for cardiovascular morbidity and mortality, and "aggressive modification of cardiovascular disease risk factors is warranted in all patients with NAFLD," according to AASLD.^[5]

The AASLD further recommends for people with a cirrhotic NASH to be systematically screened for gastric and esophageal varices and liver cancer. They do not recommend routine liver biopsies and screening for liver cancer for non-cirrhotic people with NASH, but such screening sometimes occurs on a case-by-case basis.^[5]

Also, people with MAFLD may be considered for screening for hepatocellular carcinoma (liver cancer) and gastroesophageal varices. The NICE advises regular screening of NAFLD for advanced liver fibrosis every three years to adults and every two years for children using the enhanced liver fibrosis (ELF) blood test.^[63] Follow-up is recommended for people with obesity and insulin resistance using the homeostasis model assessment of insulin resistance (HOMA-IR). People with NASH with fibrosis and hypertension merit closer monitoring as there is a higher risk of disease progression.^[16]

Transplantation

MAFLD is the second most common indication for liver transplantation in the US and Europe as of 2017.^[14] MAFLD/NASH is expected to become the leading cause of liver transplantation by 2020.^[115]

For people with NASH and end-stage liver disease, liver failure, or liver cancer, liver transplantation is an accepted procedure according to the EASL.^[16] People with NASH cirrhosis NASH who are being considered for a liver transplant warrant systematic evaluation for cardiovascular diseases (whether the symptoms are apparent or not).^[5]

The overall survival is comparable to transplantation following other diseases.^[14][16] People with NASH cirrhosis who undergo liver transplantation are more likely to die post-transplant because of cardiovascular disease or chronic kidney disease. These people with NASH are often older and are thus more prone to these complications.^[14] For these reasons and others, individuals with morbid obesity (BMI ≥ 40 kg/m²) and NASH with cirrhosis may be considered unfit for liver transplantation until they follow lifestyle modifications to reduce bodyweight.^[14] Diabetic people with poor glycemic control are at similar risks, and optimal glycemic control is essential before attempting transplantation.^[14]

The Asia Pacific Working Group guidelines recommend healthcare providers discuss lifestyle modifications before and after transplantation to reduce potential surgery risks and to assist with MAFLD management after the transplant.^[14]

Simultaneous bariatric surgery and liver transplantation were performed in exceptional circumstances.^[14]

After transplantation, liver biopsy is the best method to monitor the evolution of post-transplant fibrosis, with significant fibrosis or portal hypertension one year after transplantation predicting rapid progression and graft loss and indicating the need for urgent intervention.^[67]

Prognosis

The average progression rate from one stage of liver fibrosis to the next in humans with NASH is estimated to be seven years, compared to 14 years with MAFLD. The course of progression varies with different clinical manifestations among individuals.^{[24][26][116]} Fibrosis in humans with NASH progressed more rapidly than in humans with MAFLD.^[13] Obesity predicts a worse long-term outcome than for lean individuals.^[117][118] In the Asia-Pacific region, about 25% of MAFLD cases progress to NASH under three years, but only a low proportion (3.7%) develop advanced liver fibrosis.^[7] An international study showed that people with MAFLD with advanced fibrosis had a 10-year survival rate of 81.5%.^[5]

MAFLD is a risk factor for fibrosis, hypertension, chronic kidney disease, atrial fibrillation, myocardial infarction, ischemic stroke, and death from cardiovascular causes based on very-low to low-quality evidence from observational studies.^[63][119] Although MAFLD can cause cirrhosis and liver failure and liver cancer, most deaths among people with NAFLD are attributable to cardiovascular disease.^[50] According to a meta-analysis of 34,000 people with MAFLD over seven years, these individuals have a 65% increased risk of developing fatal or nonfatal cardiovascular events when compared to those without MAFLD.^[26]

MAFLD and NASH increase the risk of liver cancer. Cirrhosis and liver cancer induced by NAFLD were the second cause of liver transplantation in the US in 2017. Liver cancer develops in NASH in the absence of cirrhosis in 45% in the cases,^[120] and people with NASH cirrhosis have an increased risk of liver cancer. The rate of liver cancer associated with NASH increased fourfold between 2002 and 2012 in the US, which is more than any other cause of liver cancer. MAFLD constitutes the third most common risk factor for liver cancer.^[121] NAFLD and NASH were found to worsen with cirrhosis in respectively 2–3% and 15–20% of the people over a 10–20 year period.^[13] Cirrhosis is found in only about 50% of people with MAFLD and with liver cancer, so that liver cancer and cirrhosis are not always linked.^[14]

MAFLD may be a precursor of metabolic syndrome, although a bidirectional influence is possible.^{[122][123][124]} The presence and stage of fibrosis are the strongest prognostic factors for liver-related events and mortality, in particular for MAFLD.^[24]

Epidemiology

MAFLD incidence is rapidly rising, along with obesity and diabetes, and has become the most common cause of liver disease in developed countries, for adults, teenagers, and children.^[23][24] The percentage of people with MAFLD ranges from 9 to 36.9% in different parts of the world.^[125][126] Approximately 20% of the United States and 25% of the Asia-Pacific populations have non-alcoholic fatty liver.^[7][21] Similar prevalence can be found in Europe, although less data is available.^[24] MAFLD is the most common in the Middle East (32%) and South America (30%), while Africa has the lowest rates (13%).^[5][24] Compared to the 2000s, NAFL and NASH respectively increased 2-fold and 2.5-fold in the 2010s in the USA.^[127]

MAFLD and NASH are more prevalent in Hispanics - which can be attributed to high rates of obesity and type 2 diabetes in Hispanic populations, intermediate in Whites, and lowest in Blacks.^{[22][24][128]} NAFLD was observed to be twice as prevalent in men as women.^[5] For severely obese individuals, the prevalence of MAFLD rises over 90%, and for those with diabetes, over 60%, and up to 20% for normal-weight people.^[24][25] MAFLD is present in 65% to 90% of people that had bariatric surgery, and up to 75% of them have NASH.^[14] Ultrasonography and proton NMR spectroscopy studies suggest about 25% of the population seems to be affected by MAFLD or NASH.^[7][24]

Although the disease is commonly associated with obesity, a significant proportion of those affected are normal weight or lean. Lean MAFLD affects between 10 and 20% of Americans and Europeans, and approximately 25% of Asians, although some countries have a higher incidence (e.g., India has a very high proportion of lean MAFLD and almost no obese MAFLD). PNPLA3 may be relevant for the progression of MAFLD in lean people. Thus, people with MAFLD deserve consideration for treatment regardless of the presence or absence of obesity.^{[7][24][47][117]}

In children ages 1 to 19, the prevalence was found to be approximately 8% in the general population up to 34% in studies with data from child obesity clinics.^[129]

The majority of cryptogenic cirrhosis is believed to be due to NASH.^[7] NAFLD prevalence is expected to increase steadily,^[130] from 25% in 2018 to a projected 33.5% of people with MAFLD globally in 2030, and from 20% to a projected 27% of those with MAFLD will progress to NASH.^[131]

History

The first acknowledged case of obesity-related non-alcoholic fatty liver was observed in 1952 by Samuel Zelman.^[132][133] Zelman started investigating after observing a fatty liver in a hospital employee who drank more than twenty bottles of Coca-Cola a day. He then went on to design a trial for a year and a half on 20 obese people who were not alcoholic, finding that about half of them had substantially fatty livers.^[132] Fatty liver was, however, linked to diabetes since at least 1784^[134] — an observation picked up again in the 1930s.^[135] Studies in experimental animals implicated choline inadequacy in the 1920s and excess sugar consumption in 1949.^[136]

The name "non-alcoholic steatohepatitis" (NASH) was later defined in 1980 by Jurgen Ludwig and his colleagues from the Mayo Clinic^[137] to raise awareness of the existence of this pathology, as similar reports previously were dismissed as "patients' lies".^[133] This paper was mostly ignored at the time but eventually came to be seen as a landmark paper, and starting in the mid-1990s, the condition began to be intensively studied, with a series of international meetings being held on the topic since 1998.^[138] The broader NAFLD term started to be used around 2002.^[138][139] Diagnostic criteria began to be worked out, and in 2005 the Pathology Committee of the NIH NASH Clinical Research Network proposed the NAS scoring system.^[138]

Society and culture

Political recommendations

EASL recommends Europe's public health authorities to "restrict advertising and marketing of sugar-sweetened beverages and industrially processed foods high in saturated fat, sugar, and salt", as well as "fiscal measures to discourage the consumption of sugar-sweetened beverages and legislation to ensure that the food industry improves labeling and the composition of processed foods", as well as "public awareness campaigns on liver disease, highlighting that it is not only linked to excessive consumption of alcohol".^[130]

Media

In France, the French syndicate of non-alcoholic beverages "Boissons Rafraîchissantes de France" (that included soft drink producers such as Coca-Cola France, Orangina, PepsiCo France) was denounced by the French journal fr:Canard Enchainé for misleading consumers using a communication on their website titled "Better understanding the NASH pathology",^[140] explaining that "NASH pathology is sometimes called the soda illness by language abuse or an unfortunate semantic shortcut, as it is not directly linked to the consumption of non-alcoholic beverages". This page and others on the same website, such as one titled "Say no to disinformation," were since then removed.^[141]

Children

Pediatric MAFLD was first reported in 1983.

Boys are more likely to be diagnosed with MAFLD than girls.[27]^[129] Overweight, or even weight gain, in childhood and adolescence, is associated with an increased risk of MAFLD later in life, with adult NAFLD predicted in a 31-year follow-up study by risk factors during childhood including BMI, plasma insulin levels, male sex, genetic background (PNPLA3 and TM6SF2 variants) and low birth weight, an emerging risk factor for adulthood MAFLD.^[24][27] In a study, simple steatosis was present in up to 45% in children with a clinical suspicion of MAFLD.^[27] Children with simple steatosis have a worse prognosis than adults, with significantly more of them progressing from NAFLD to NASH compared to adults. Indeed, 17-25% of children with MAFLD develop a NASH in general, and up to 83% for children with severe obesity (versus 29% for adults), further suggesting that hepatic fibrosis seems to follow a more aggressive clinical course in children compared to adults.^[143]

Early diagnosis of MAFLD in children may help prevent the development of liver disease during adulthood.^[147][150] This is challenging as most children with MAFLD are asymptomatic, with only 42-59% showing abdominal pain.^[27][150] Other symptoms might be present, such as right upper quadrant pain or acanthosis nigricans, the latter of which is often present in children with NASH. An enlarged liver occurs in 30–40% of children with NAFLD.^[27]

The AASLD recommends a diagnostic liver biopsy in children when the diagnosis is unclear or before starting a potentially hepatotoxic medical therapy.

Intensive lifestyle modifications, including physical activity and dietary changes, are the first line of treatment according to AASLD and EASL as it improves the liver histology and aminotransferase levels. In terms of pharmacological treatment, the AASLD and EASL do not recommend metformin, but vitamin E may improve liver health for some children.[5]^[16] The NICE advises the use of vitamin E for children with advanced liver fibrosis, whether they have diabetes or not.^[63] The only treatment shown to be effective in childhood MAFLD is weight loss.^[151]

Some evidence indicates that maternal undernutrition or overnutrition increases a child's susceptibility to NASH and hastens its progression.^[152]

Research

Diagnosis and biomarkers

Since a MAFLD diagnosis based on a liver biopsy is invasive and makes it difficult to estimate epidemiology, it is a high research priority to find accurate, inexpensive, and noninvasive methods of diagnosing and monitoring MAFLD disease and its progression.

According to a review, proton density fat fraction estimation by magnetic resonance imaging (MRI-PDFF) may be considered the most accurate and even gold standard test to quantify hepatic steatosis. They recommend ultrasound-based transient elastography to accurately diagnose both fibrosis and cirrhosis in a routine clinical setting, with more objectivity than ultrasonography but with lower accuracy than magnetic resonance elastography; and plasma cytokeratin 18 (CK18) fragment levels to be a moderately accurate biomarker of steatohepatitis.^[32] However, transient elastography can fail for people with pre-hepatic portal hypertension.^[67]

Medication development

A variety of medications with different

1. Improving metabolism (improving insulin sensitivity,
   glucose-dependent insulinotropic polypeptide (GIP) or glucagon co-agonists and thyromimetics. Some of these drugs may treat NAFLD by significantly reducing body weight.^[156]
2. Reducing inflammation, for example reducing
   c-Jun N-terminal kinase inhibitors, have not shown benefit.^[156]
3. "Gut-liver axis targets" that either change a person's
   bile acids^[155]
4. Anti-fibrotic drugs,[155] such as fibroblast growth factor analogues, which have largely not met their endpoints^[156]

Other treatments such as farnesoid X receptor (FXR) agonists, peroxisome proliferator-activated receptor (PPAR) agonists, and ASK1 (apoptosis signal-regulating kinase 1) inhibitors may improve NAFLD by multiple mechanisms simultaneously.^[156] Drugs in phase III trials as of 2023 are obeticholic acid (a FXR agonist), the thyromimetic resmetirom, lanifibranor (a pan-PPAR agonist), and the GLP-1 agonist semaglutide.^[154]

Notes

References