Study finds fatty diets reprogram liver cells, raising cancer risk - Video

Every meal you eat could be quietly shaping your liver's future. A new study from the Massachusetts Institute of Technology (MIT), published in Cell, reveals how a high fat diet can rewire liver cells, pushing them back into an immature, stem cell like state that helps them survive stress-but at a dangerous cost. Over time, these “reverted” cells become far more likely to turn cancerous, explaining why fatty diets are among the strongest risk factors for liver cancer worldwide.

Liver cancer often develops after years of fat buildup and inflammation, a condition known as steatotic liver disease. While this disease is usually linked to obesity, alcohol, or metabolic disorders, the molecular steps connecting diet and cancer have remained unclear. To fill that gap, scientists from MIT’s Koch Institute for Integrative Cancer Research and Harvard MIT Program in Health Sciences and Technology tracked how the liver changes under the stress of a fatty diet.

Using single cell RNA sequencing, the team analyzed liver cells from mice fed a high fat diet over time. This powerful method allowed them to measure which genes were switched on or off as liver inflammation progressed to scarring and, ultimately, cancer. Early in the disease process, hepatocytes—the liver’s main functional cells—began switching on genes that promote survival and proliferation, while silencing those responsible for normal metabolism. “It’s a trade off,” explained lead author Constantine Tzouanas. “The cells protect themselves from stress, but in doing so, they lose their mature identity-making them more vulnerable to tumor causing mutations.”

By the study’s end, nearly all mice on the high fat diet had developed liver tumors. The researchers also pinpointed key transcription factors—including SOX4 and thyroid hormone receptor—that control this regression process.

When the team examined human liver samples, they saw the same pattern: declining function in mature liver genes and rising expression of “pro survival” ones predicted poorer patient outcomes after cancer developed.

The next step, researchers say, is to test whether returning to a balanced diet or using emerging weight loss drugs like GLP 1 agonists can reverse these molecular changes before irreversible damage occurs.

This discovery offers fresh hope that by targeting early cellular reprogramming, doctors may one day prevent liver cancer in those most at risk—starting not in the tumor, but in the dinner plate.

REFERENCE: Tzouanas, Constantine N. et al.; Hepatic adaptation to chronic metabolic stress primes tumorigenesis; Cell, Volume 0, Issue 0; DOI: 10.1016/j.cell.2025.11.031