Study Finds One Fat Linked to Tumor Growth, Another Halves Disease Burden - Video

Not all fats are created equal, especially when it comes to cancer.

A new study published in Cancer Discovery suggests that the type of fat people consume may play a crucial role in pancreatic cancer development. Researchers found that some dietary fats appear to fuel tumor growth, while others may help slow the disease by making cancer cells more vulnerable to destruction.

The research focused on pancreatic ductal adenocarcinoma (PDAC), the most common and deadliest form of pancreatic cancer. Scientists at Yale School of Medicine designed 12 different high-fat diets for mice, keeping calorie content the same while changing the source of fat. This allowed them to isolate the effects of specific fatty acids on cancer progression.

One of the study's most surprising findings involved oleic acid, a monounsaturated fat commonly found in olive oil, peanuts, and certain vegetable oils. Mice predisposed to pancreatic cancer developed tumors more rapidly when fed diets rich in oleic acid. The result was unexpected because oleic acid is widely regarded as beneficial for heart health.

In contrast, diets rich in polyunsaturated fatty acids (PUFAs), particularly omega-3 fatty acids found in fish oil, significantly slowed cancer development. Researchers reported that mice fed fish oil-enriched diets experienced about a 50% reduction in disease burden compared with those consuming standard fat diets.

Further investigation revealed a possible explanation. Cancer cells can be eliminated through a process called ferroptosis, a form of cell death triggered by lipid oxidation. Polyunsaturated fats are more susceptible to oxidation, making cancer cells easier to destroy. Monounsaturated fats, however, protect cells from oxidation, helping tumors survive and grow.

Although the findings are based on animal studies and have not yet been confirmed in humans, they suggest that fat quality may be more important than total fat intake when it comes to pancreatic cancer risk.

REFERENCE: Christian Felipe. Ruiz, Xiangyu Ge, Rylee McDonnell, Sherry S. Agabiti, Daniel C. McQuaid, Andy Tang, Meera Kharwa, Jennifer Goodell, Rocio del M. Saavedra-Pena, Allison Wing, Guangtao Li, Natasha Pinto. Medici, Marie E. Robert, Rohan R. Varshney, Michael C. Rudolph, Fred S. Gorelick, John Wysolmerski, Daniel Canals, John D. Haley, Matthew S. Rodeheffer, Mandar Deepak. Muzumdar. Diet-induced phospholipid remodeling dictates ferroptosis sensitivity and tumorigenesis in the pancreas. Cancer Discovery, 2026; DOI: 10.1158/2159-8290.CD-25-0734