MASLD vs. NAFLD vs. MAFLD: What's the Difference?

NAFLD, MAFLD, MASLD. If you've seen more than one of these terms and wondered whether they mean the same thing, here's the actual timeline.

By Charles Kirkland, Founder, Metabolic Clarity Labs
Updated August 2026

Quick answer: NAFLD (non-alcoholic fatty liver disease) was the original name, used for decades. MAFLD (metabolic-associated fatty liver disease) was proposed in 2020 as a metabolism-focused alternative. MASLD (metabolic dysfunction-associated steatotic liver disease) is the current name, adopted in 2023 through a multi-society consensus, and is now the standard term used in clinical guidelines.

NAFLD: the original, exclusion-based name

For decades, this condition was called non-alcoholic fatty liver disease. The name was defined by exclusion: fatty liver disease that wasn't caused by heavy alcohol use. This framing had a real limitation. It told you what wasn't causing the fat buildup without saying much about what was, and it didn't require any positive metabolic risk factor to make the diagnosis.

MAFLD: the 2020 metabolic-focused proposal

In 2020, an international panel of experts proposed replacing NAFLD with MAFLD, metabolic-associated fatty liver disease. This name shifted the definition toward what actually drives the condition: metabolic dysfunction. Under MAFLD criteria, diagnosis required evidence of fat in the liver plus at least one of several metabolic risk factors, regardless of alcohol use. MAFLD saw meaningful adoption in research but didn't fully replace NAFLD in clinical practice before the next change arrived.

MASLD: the 2023 consensus name

In 2023, a broader multi-society consensus process, involving liver specialty organizations across multiple continents, settled on metabolic dysfunction-associated steatotic liver disease, or MASLD, as the term going forward. MASLD refined the MAFLD approach further and added a related category: MetALD, for people who have both significant cardiometabolic risk factors and meaningful alcohol intake, sitting between MASLD and traditional alcohol-related liver disease.

MASLD is now the term used in current AASLD and EASL-EASD-EASO clinical practice guidelines, and it's the term you're most likely to encounter in recent research and from your healthcare provider going forward.

Why does the name keep changing?

Each renaming reflected a genuine shift in scientific understanding, not just a rebrand. Researchers increasingly recognized that this liver condition is best understood as a manifestation of metabolic dysfunction, sharing the same underlying risk factors as metabolic syndrome, rather than a liver-specific problem defined mainly by what it isn't. There was also a stated goal of reducing stigma associated with the word "alcoholic" appearing in a diagnosis for people who didn't drink heavily at all.

Does the name change affect your care?

If you were previously diagnosed with NAFLD or MAFLD, the underlying condition in your liver hasn't changed, only the terminology and diagnostic framework have been refined. Your healthcare provider can tell you how your specific diagnosis maps to current MASLD criteria, and whether the more specific cardiometabolic risk factor requirement changes anything about your monitoring or care plan.

Frequently asked questions

Is MASLD the same disease as NAFLD?

Largely yes, with a more specific diagnostic framework. MASLD requires at least one cardiometabolic risk factor for diagnosis, while older NAFLD criteria did not. Most people previously diagnosed with NAFLD would also meet MASLD criteria.

What happened to the term MAFLD?

MAFLD was an intermediate step between NAFLD and MASLD, proposed in 2020. The 2023 consensus process built on MAFLD's metabolic focus but ultimately settled on MASLD as the term moving forward.

What is MetALD?

MetALD describes people who have both meaningful cardiometabolic risk factors and moderate-to-significant alcohol intake, occupying a middle category between MASLD and alcohol-related liver disease.

The Metabolic Clarity takeaway

The terminology has evolved, but the underlying message has stayed consistent: fatty liver disease is closely tied to the same metabolic factors behind Storage Load, Glucose Load, and Inflammatory Load.

Next step: Read the Complete Guide to Fatty Liver (MASLD) for the full picture on diagnosis and management.

Sources

Charles Kirkland is the founder of Metabolic Clarity Labs. He is not a physician. His writing is based on his own documented health experience, alongside cited research sources.

Medical and regulatory disclaimer: This article is for general education only. It does not diagnose, treat, or prevent disease and does not replace advice from a physician or other qualified health professional.

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