New research suggests that the type of fat people eat may matter more than the amount when it comes to cancer risk. The study focuses on Pancreatic ductal adenocarcinoma, one of the most aggressive cancers.
In experiments using mice with the same calorie intake, different fats had very different effects. Oleic acid, a monounsaturated fat found in foods like olive oil and peanuts, unexpectedly sped up tumor growth. In contrast, omega-3 fatty acids from fish oil reduced tumor burden by about 50%.
The researchers found that these effects are linked to ferroptosis, a type of cell death caused by lipid oxidation. Polyunsaturated fats are more prone to oxidation, making cancer cells easier to destroy. Monounsaturated fats resist oxidation, helping cancer cells survive.
The study also showed that higher ratios of monounsaturated to polyunsaturated fats were associated with more disease. The tumor-promoting effect of oleic acid was seen mainly in male mice, while omega-3 fats were protective in both sexes.
Although the findings are based on animal studies, they suggest that people at high risk of pancreatic cancer—such as those with obesity or chronic pancreatitis—may benefit from diets richer in polyunsaturated fats. Future research will explore whether these dietary changes can help patients and whether blood fat levels could serve as early warning markers.
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