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Metabolic dysfunction associated fatty liver disease: The new nomenclature and its impact

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Nomenclature Dilemma of Metabolic Associated Fatty Liver Disease (MAFLD): Considerable Proportions of MAFLD Are Metabolic Healthy

Huiyul Park et al.

Summary: This study investigated the proportion of subjects with metabolic dysfunction-associated fatty liver disease (MAFLD) and assessed the fibrosis and cardiovascular risk in metabolically healthy MAFLD subjects. The results showed that 26.6% of MAFLD subjects were metabolically healthy and had comparable fibrosis burden and cardiovascular risk to the healthy control group.

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Jing Zeng et al.

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Impact of renaming NAFLD to MAFLD in an Australian regional cohort: Results from a prospective population-based study

William Kemp et al.

Summary: The study found a higher prevalence of metabolic-associated fatty liver disease (MAFLD) compared to non-alcoholic fatty liver disease (NAFLD) in a well-defined cohort, with the increased prevalence of MAFLD primarily driven by the presence of dual etiologies of liver disease. All participants classified as NAFLD also met the new definition of MAFLD.

JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY (2022)

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Dietary and Lifestyle Inflammation Scores Are Inversely Associated with Metabolic-Associated Fatty Liver Disease among Iranian Adults: A Nested Case-Control Study

Ehsaneh Taheri et al.

Summary: The study found that higher balances of pro- relative to anti-inflammatory dietary and lifestyle exposures may be associated with higher MAFLD risk among adults, suggesting that inflammation may be the primary mechanism through which diet affects MAFLD risk.

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Prevalence and Risk Factors of Metabolic-Associated Fatty Liver Disease among 73,566 Individuals in Beijing, China

Qianli Yuan et al.

Summary: The prevalence and risk factors of metabolic-associated fatty liver disease (MAFLD) among adults in Beijing were investigated in this study. The results showed that the prevalence of MAFLD in Beijing adults was 32.40%, and risk factors such as male gender, older age, lower education, and urban residence were independently associated with MAFLD. Furthermore, even lean/normal-weight individuals were found to be at risk of developing MAFLD.

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Single Nucleotide Polymorphism of Genes Associated with Metabolic Fatty Liver Disease

Tong Mu et al.

Summary: This study revealed the relationship between single nucleotide polymorphism (SNP) of PNPLA3, TM6SF2, MBOAT7, GATAD2A, and STAT3 genes and metabolism-related fatty liver disease (MAFLD). Several genotypes were found to be associated with the occurrence of MAFLD.

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Metabolic dysfunction-associated fatty liver disease improves detection of high liver stiffness: The Rotterdam Study

Laurens A. van Kleef et al.

Summary: Research on a large population found that metabolic dysfunction-associated fatty liver disease (MAFLD) is more strongly associated with liver disease progression, including fibrosis and higher liver stiffness, while non-alcoholic fatty liver disease (NAFLD) shows no significant correlation with these indicators.

HEPATOLOGY (2022)

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Metabolic Dysfunction-associated Fatty Liver Disease and Mortality Among Chinese Adults: a Prospective Cohort Study

Xiaomo Wang et al.

Summary: MAFLD is associated with increased all-cause mortality among the Chinese population, and the risk is influenced by factors such as overweight/obesity, diabetes, other metabolic indicators, and second causes. Management of MAFLD patients should consider metabolic indicators and second causes for precise treatment and management.

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Obesity is an important determinant of severity in newly defined metabolic dysfunction-associated fatty liver disease

Ji Hye Huh et al.

Summary: Obesity, rather than metabolic abnormalities, is the principal determinant of severe hepatic steatosis and fibrosis in patients with MAFLD.

HEPATOBILIARY & PANCREATIC DISEASES INTERNATIONAL (2022)

Article Gastroenterology & Hepatology

Are there outcome differences between NAFLD and metabolic-associated fatty liver disease?

Zobair M. Younossi et al.

Summary: This study compared the long-term outcomes of NAFLD and MAFLD and found that they have similar clinical profiles and long-term prognosis. Insulin resistance is a predictor of liver mortality in NAFLD, while alcohol-associated liver disease (ALD) is the primary driver of mortality in MAFLD.

HEPATOLOGY (2022)

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Development of a prediction protocol for the screening of metabolic associated fatty liver disease in children with overweight or obesity

Maddi Oses et al.

Summary: This study aimed to develop a non-invasive and accurate prediction protocol for the identification of MAFLD among children with overweight/obesity. By measuring blood biochemical parameters and determining candidate SNPs, a prediction protocol with high sensitivity and specificity was developed.

PEDIATRIC OBESITY (2022)

Article Gastroenterology & Hepatology

A new risk stratification strategy for fatty liver disease by incorporating MAFLD and fibrosis score in a large US population

Ya-Cong Zhang et al.

Summary: This study demonstrated the validity of MAFLD subtype and fibrosis score in stratifying the risk of FLD patients using a representative sample of the US population. These findings can guide the determination of surveillance options for FLD patients.

HEPATOLOGY INTERNATIONAL (2022)

Article Gastroenterology & Hepatology

Impact of the new definition of metabolic dysfunction-associated fatty liver disease on detection of significant liver fibrosis in US adolescents

Stefano Ciardullo et al.

Summary: This study aimed to evaluate the prevalence of MAFLD among US adolescents and investigate whether the new MAFLD definition can identify individuals with more advanced liver disease. The study found that most US adolescents with elastographic evidence of steatosis meet the criteria for MAFLD, but these criteria do not appear to improve the detection of subjects with more advanced liver disease.

HEPATOLOGY COMMUNICATIONS (2022)

Article Gastroenterology & Hepatology

From NAFLD to MAFLD: Implications of a Premature Change in Terminology

Zobair M. Younossi et al.

Summary: The article discusses the proposal to rename NAFLD to MAFLD, highlighting the shortcomings of the new term and warning that changing the name without a comprehensive understanding may have negative implications for the field. The recommendation is to establish a true international consensus group to assess the impact and consequences of the terminology change and make recommendations based on available evidence to move the field forward.

HEPATOLOGY (2021)

Article Gastroenterology & Hepatology

Clinical and Histologic Features of Patients with Biopsy-Proven Metabolic Dysfunction-Associated Fatty Liver Disease

Shang-Chin Huang et al.

Summary: The study examined and compared the clinical and histologic features of MAFLD versus NAFLD in patients with biopsy-proven hepatic steatosis. Results showed that MAFLD patients exhibited a higher degree of disease severity, and advanced fibrosis was associated with hepatitis B virus infection and metabolic diseases.

GUT AND LIVER (2021)

Article Gastroenterology & Hepatology

Differential Clinical Characteristics and Mortality Outcomes in Persons With NAFLD and/or MAFLD

Vy H. Nguyen et al.

Summary: The study found that individuals meeting the criteria for MAFLD had more comorbidities and worse prognosis compared to those with NAFLD only. Non-NAFLD MAFLD participants had the highest cumulative incidence of all-cause mortality, followed by NAFLD-MAFLD and non-MAFLD NAFLD participants. The MAFLD criteria should be considered in the general population to identify high-risk groups for early interventions.

CLINICAL GASTROENTEROLOGY AND HEPATOLOGY (2021)

Article Gastroenterology & Hepatology

Impact of the New Definition of Metabolic Associated Fatty Liver Disease on the Epidemiology of the Disease

Vincent Wai-Sun Wong et al.

Summary: The new definition of MAFLD does not significantly change the prevalence compared with NAFLD, but it may reduce the incidence by 25%. People with hepatic steatosis but not fulfilling the definition of MAFLD unlikely have significant liver disease.

CLINICAL GASTROENTEROLOGY AND HEPATOLOGY (2021)

Article Gastroenterology & Hepatology

Risk of cardiovascular disease in patients with fatty liver disease as defined from the metabolic dysfunction associated fatty liver disease or nonalcoholic fatty liver disease point of view: a retrospective nationwide claims database study in Japan

Masato Yoneda et al.

Summary: The study found that the incidence rate of CVD increased significantly in NAFLD or MAFLD patients, and the proportion of diabetes mellitus and hypertriglyceridemia among them is also high, which may affect the development of CVD.

JOURNAL OF GASTROENTEROLOGY (2021)

Review Gastroenterology & Hepatology

The Latin American Association for the Study of the Liver (ALEH) position statement on the redefinition of fatty liver disease

Nahum Mendez-Sanchez et al.

Summary: The Latin American Association for the Study of the Liver aims to promote liver health and quality patient care, with a recent focus on fatty liver disease associated with metabolic dysfunction. A consensus was reached to rename the disease as metabolic-associated fatty liver disease and to diagnose it using a set of simple criteria. This change is expected to improve disease awareness and advancements in various aspects of the disease.

LANCET GASTROENTEROLOGY & HEPATOLOGY (2021)

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Nomenclature and definition of metabolic-associated fatty liver disease: a consensus from the Middle East and north Africa

Gamal Shiha et al.

Summary: Fatty liver disease associated with metabolic dysfunction is a global health problem, particularly prevalent in the Middle East and North Africa. The current nomenclature and diagnostic criteria for the disease have raised concerns among experts, leading to a proposal to rename it as metabolic-associated fatty liver disease (MAFLD) and diagnose it by positive criteria. Recommendations are being made to work with authorities in the region to implement these changes and improve healthcare for patients.

LANCET GASTROENTEROLOGY & HEPATOLOGY (2021)

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Prevalence of NAFLD, MAFLD and associated advanced fibrosis in the contemporary United States population

Stefano Ciardullo et al.

Summary: Limited data are available on the epidemiological implications of renaming NAFLD to MAFLD. A cross-sectional study using NHANES data found similar prevalence rates of NAFLD and MAFLD in the general US population, with a high agreement between the two definitions and higher rates among Hispanic individuals. Additionally, patients with either NAFLD or MAFLD showed similar risk of advanced liver fibrosis.

LIVER INTERNATIONAL (2021)

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Outcomes of NAFLD and MAFLD: Results from a community-based, prospective cohort study

Madunil Anuk Niriella et al.

Summary: This study compared the impact of NAFLD and MAFLD on health outcomes and found that the risks of new-onset metabolic traits and cardiovascular events were similar between the two during a 7-year follow-up. Individuals excluded by the NAFLD definition but captured by the MAFLD definition showed a higher risk of adverse outcomes compared to those excluded by the MAFLD definition but captured by the NAFLD definition.

PLOS ONE (2021)

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The KLB rs17618244 gene variant is associated with fibrosing MAFLD by promoting hepatic stellate cell activation

Nadia Panera et al.

Summary: The study showed that the KLB rs17618244 variant is associated with hepatic fibrosis, inflammation, and cirrhosis mainly in obese adult patients with MAFLD. Additionally, hepatic stellate cells (HSCs) carrying this mutation exhibit enhanced proliferative rates and acquire a myofibroblast-like phenotype.

EBIOMEDICINE (2021)

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MAFLD Criteria Guide the Subtyping of Patients with Fatty Liver Disease

Jiaofeng Huang et al.

Summary: This study found that MAFLD patients diagnosed with different numbers of metabolic conditions tended to be older, more likely to be female, and had more severe renal impairment and liver fibrosis. Additionally, MAFLD patients diagnosed with fewer metabolic conditions were more likely to have excessive alcohol consumption. Among patients diagnosed with a single metabolic condition, those with diabetes alone had the highest risk.

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Prevalence of and risk factors for metabolic associated fatty liver disease in an urban population in China: a cross-sectional comparative study

Yu-ling Chen et al.

Summary: MAFLD is prevalent in China and varies considerably among different age, sex, BMI, and female menopausal status groups. MAFLD is related to metabolic disorders, especially obesity, while metabolic disorders also play important roles in the occurrence of MAFLD in nonobese individuals. MAFLD patients exhibit a high prevalence of metabolic syndrome, dyslipidaemia, hyperuricaemia, and elevated liver enzymes. MAFLD tends to coexist with systemic metabolic disorders, and a deep inner relationship may exist between MAFLD and metabolic syndrome. Metabolic disorders should be considered to improve the management of MAFLD.

BMC GASTROENTEROLOGY (2021)

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Fibrosis Burden of Missed and Added Populations According to the New Definition of Metabolic Dysfunction-Associated Fatty Liver

Huiyul Park et al.

Summary: With the proposal of the new MAFLD definition, the added population (MAFLD-only group) shows a higher metabolic and fibrosis burden compared to those in the missed population (NAFLD-only group).

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MAFLD better predicts the progression of atherosclerotic cardiovascular risk than NAFLD: Generalized estimating equation approach

Tsubasa Tsutsumi et al.

Summary: The study found that MAFLD patients had a higher risk of worsening ASCVD compared to NAFLD patients. The superiority of MAFLD was attributed to metabolic dysfunction rather than moderate alcohol consumption.

HEPATOLOGY RESEARCH (2021)

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Metabolic dysfunction-associated fatty liver disease is associated with increased all-cause mortality in the United States

Donghee Kim et al.

Summary: This study demonstrated that metabolic dysfunction-associated fatty liver disease (MAFLD) was associated with an increased risk of all-cause mortality in US adults, while non-alcoholic fatty liver disease (NAFLD) showed no association with all-cause mortality after adjusting for metabolic risk factors. Individuals who met the criteria for MAFLD but not NAFLD had a higher risk of all-cause mortality.

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Prevalence and risk factors of metabolic associated fatty liver disease in the contemporary South China population

Jiahua Fan et al.

Summary: This study in South China found a high prevalence of MAFLD, with risk factors including overweight/obesity, type 2 diabetes, and metabolic dysregulation. High physical activity and moderate consumption of soups may be protective factors against MAFLD.

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NAFLD or MAFLD: Which Has Closer Association With All-Cause and Cause-Specific Mortality?-Results From NHANES III

Qi Huang et al.

Summary: The study found that participants with MAFLD or NAFLD were highly concordant, with MAFLD showing a greater overall mortality risk compared to NAFLD, but equal risk for cause-specific mortality. The new terminology excluded participants with lower mortality risk and included those with higher risk.

FRONTIERS IN MEDICINE (2021)

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Open Issues in the Transition from NAFLD to MAFLD: The Experience of the Plinio Study

Francesco Baratta et al.

Summary: Applying the MAFLD criteria to a cohort of dysmetabolic patients with NAFLD led to a significant overlap between the NAFLD and MAFLD diagnoses, with specific subgroups such as lean NAFLD patients being excluded by the new MAFLD definition.

INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH (2021)

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Comparison of MAFLD and NAFLD diagnostic criteria in real world

Su Lin et al.

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MAFLD identifies patients with significant hepatic fibrosis better than NAFLD

Sakura Yamamura et al.

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Genetics and epigenetics of NAFLD and NASH: Clinical impact

Mohammed Eslam et al.

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