For the 3.5 million prostate cancer survivors in the U.S., what's on the dinner plate may matter more than previously thought. A new study published in JAMA Network Open analyzed nearly 5,000 men with nonmetastatic prostate cancer and found that high saturated and animal fat intake was significantly linked to greater mortality — not from prostate cancer itself, but from cardiovascular disease and other cancers.

The encouraging flip side: modest dietary substitutions can meaningfully reduce that risk. Swapping just 5% of saturated fat calories for monounsaturated fats (like olive oil or avocado) was associated with a 20% lower all-cause mortality risk. Replacing 10% of animal fat calories with plant-based fats cut mortality risk by 16%.

By the Numbers:

• 24% higher all-cause mortality risk in the highest vs. lowest quintile of saturated fat intake
• 42% greater cardiovascular disease mortality risk with high saturated fat consumption
• 49% higher risk of death from other cancers with high animal fat intake
• 20% reduction in all-cause mortality by replacing 5% of saturated fat with monounsaturated fat
• 16% reduction in all-cause mortality by replacing 10% of animal fat with plant-based fat

Why it matters: Most prostate cancer patients outlive their diagnosis — meaning lifestyle factors like diet play a major role in long-term health. Clinicians now have evidence-backed, practical dietary guidance to share at follow-up visits, even years after diagnosis.