Human study · Nutrition · 2 Sept 2026
After prostate cancer, more plant fats tracked longer life — mostly via heart deaths, not the cancer
Source: Harvard Health
What the research found
Study (observational). Health Professionals Follow-Up Study investigators report in JAMA Network Open (2 September 2026) on 4,884 men with nonmetastatic prostate cancer (mean age 69.5) followed a mean ~13 years. Highest post-diagnosis saturated-fat intake tracked 24% higher all-cause death versus lowest, driven by cardiovascular and other-cancer deaths (each ~42% higher); no fat type tracked prostate-cancer death. Swapping 10% of calories from animal fat to plant fat tracked 16% lower death; 5% of calories from saturated to monounsaturated fat tracked 20% lower death. Association, not a cancer diet. Educational nutrition notes, not a substitute for oncology care.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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