# Five Distinct Subtypes of Fatty Liver Disease Discovered by Mayo Clinic and Virginia Tech

> Researchers have identified five distinct biological subtypes of metabolic dysfunction-associated steatotic liver disease (MASLD), a condition affecting nearly 30% of adults worldwide, challenging its prior classification as a single illness.

By PrimaryBrief newsroom · Published 2026-10-19T13:24:48.058360Z
Canonical: https://primarybrief.com/article/five-distinct-subtypes-of-fatty-liver-disease-discovered-by-mayo-clinic-and-virginia-tech-bcfae1db

Researchers from the Mayo Clinic and Virginia Tech have identified five distinct biological subtypes of metabolic dysfunction-associated steatotic liver disease (MASLD), challenging the long-held view that the condition is a single illness [2][3][4]. This discovery, published in Nature Communications, redefines a disease affecting nearly 30% of adults worldwide [2][4][5].

This finding is significant because each of these five subtypes carries different risks for serious health complications, including heart disease, liver failure, cancer, and the need for liver transplantation [2][4][5]. Recognizing these distinctions could lead to more precise screening, earlier identification of high-risk patients, and personalized treatment strategies for millions of people [3][4][5].

## What the records show

The study, conducted by researchers from the Mayo Clinic and Virginia Tech, analyzed genetic and detailed clinical data from over 4,600 patients with MASLD [3]. Before this research, MASLD, formerly known as nonalcoholic fatty liver disease, was generally treated as a single condition marked by fat accumulation in the liver [4][5]. The research now shows that MASLD develops through multiple biological pathways [2][5]. Some subtypes are strongly influenced by inherited genetic factors and can lead to advanced liver disease even in patients without typical metabolic risk factors like obesity or diabetes [2][3]. Other subtypes are more closely tied to metabolic issues [2][5]. The study also revealed associations between certain MASLD subtypes and conditions such as depression, sleep apnea, and migraine [6]. Shulan Tian, a bioinformatician at Mayo Clinic and co-senior author of the study, stated that analyzing clinical and genomic data at this scale reveals "patterns of disease progression that would otherwise remain hidden" [4].

## What changed and for whom

For patients diagnosed with MASLD, this reclassification means the potential for more targeted care. The traditional approach treated MASLD as a uniform condition, but the new understanding suggests that different biological drivers necessitate different diagnostic and therapeutic approaches [2][4]. Identifying these subtypes can help clinicians to more accurately predict a patient's risk of disease progression, including to cirrhosis, liver cancer, or the need for a liver transplant [4][5]. Personalized treatment based on a specific subtype could lead to more effective interventions and improved patient outcomes [3][4].

## What the subject has said publicly

Shulan Tian, co-senior author and a bioinformatician at Mayo Clinic, noted that once these subtypes are separated, medical professionals "can start to match treatments to the biology that's actually driving the disease" [4].

## What we could not confirm

The study does not detail the specific names or identifying characteristics of each of the five subtypes. The long-term efficacy of subtype-specific treatments has not yet been established.

## Evidence cited
1. Fatty liver disease is actually five different conditions, scientists discover (www.sciencedaily.com) — https://www.sciencedaily.com/releases/2026/10/261016070642.htm
2. A large study found five MASLD subtypes, including genetic forms linked to advanced liver disease without typical metabolic risk factors (technologynetworks.com) — https://technologynetworks.com/
3. The study, published in Nature Communications and conducted in collaboration with scientists at Virginia Tech, shows that metabolic dysfunction-associated steatotic liver disease has multiple pathways — some tied to obesity and diabetes, others driven by inherited genetic factors. Notably, genetic subtypes are associated with a higher risk of progression to advanced liver disease, including in patients without typical metabolic risk factors. The findings could help identify high-risk patients ea (instagram.com) — https://instagram.com/
4. ROCHESTER, Minn. — A liver disease affecting nearly 30% of adults worldwide is not a single illness but five biologically distinct subtypes, Mayo Clinic researchers have found. Each carries different risks for heart disease, liver failure, cancer and the need for liver transplantation. The study, published in Nature Communications and conducted in collaboration with scientists at Virginia Tech, shows that metabolic dysfunction-associated steatotic liver disease has multiple pathways — some tied  (mayoclinic.org) — https://www.mayoclinic.org/
5. Researchers at Mayo Clinic have identified five biologically distinct subtypes of metabolic dysfunction-associated steatotic liver disease (MASLD), challenging the view that the condition is a single disease. The study, conducted in collaboration with researchers at Virginia Tech, found that each subtype is associated with different risks of cardiovascular disease, liver failure, cancer and the need for liver transplantation. The findings could help clinicians identify people at greater risk of  (ckmcollaborative.com) — https://ckmcollaborative.com/
6. The new study's finding that certain MASLD subtypes are associated with depression, sleep apnea, and migraine broadens the spectrum of recognized comorbidities [new study]. How prevalent is MASLD globally, and what drives its increase? (consensus.app) — https://consensus.app/