Dietary Changes Linked to Improved Survival in Prostate Cancer Patients

A recent study suggests that altering one aspect of daily diets might improve the survival chances for patients with prostate cancer. Researchers at the Harvard T.H. Chan School of Public Health explored the relationship between dietary fat consumption and mortality among patients with nonmetastatic prostate cancer. This study highlights how switching from animal and saturated fats like red meat, butter, and full-fat dairy to plant-based and unsaturated options such as olive oil and nuts may reduce mortality risks among prostate cancer patients.

The American Cancer Society states that approximately 1 in 8 men will face a prostate cancer diagnosis during their lifetime, with around 333,000 new cases annually in the U.S. It ranks as the second leading cause of cancer deaths in American men, preceded only by lung cancer, with 1 in 44 men succumbing to the disease. These findings were published in the journal JAMA Network Open on September 2.

“The results support the notion that dietary fats seem to influence prostate cancer’s development and progression,” Dr. Leonard Gomella from Jefferson Medical College conveyed to Newsweek.

Dr. Arul Chinnaiyan, Director at the Michigan Center for Translational Pathology, shared his optimism: “These findings suggest that practical dietary modifications may enhance long-term health for men with nonmetastatic prostate cancer.” Importantly, he noted, “the key focus was on overall survival; the study didn’t show fewer prostate cancer-specific deaths.”

Research Findings

The study involved nearly 5,000 patients diagnosed with nonmetastatic prostate cancer, averaging an age of 69.5. The median follow-up period lasted 12.8 years, during which over 3,000 participants died. Around 400 died due to prostate cancer, 500 from other cancers, and 800 from cardiovascular issues.

Results indicated higher saturated fat intake after diagnosis was linked to increased all-cause mortality. Minor dietary adjustments proved impactful: substituting 5% of calories from carbohydrates with saturated or animal fats raised the all-cause mortality risk. Conversely, replacing 5% of calories from saturated fats with monounsaturated or plant-based fats reduced this risk. Specifically, substituting 5% of carbohydrate calories with saturated fats was tied to a 15% rise in overall death rates.

Findings echoed results from the Physicians’ Health Study, which involved nearly 1,000 nonmetastatic prostate cancer patients, observing a 44% lower death risk when patients replaced 10% of calories from animal fats with plant-based alternatives.

Potential Benefits of Plant-Based Fats

“High-fat diets can elevate inflammation markers, potentially propelling prostate cancer progression,” Dr. Daniel Petrylak from Yale University mentioned to Newsweek.

Reducing inflammation might mitigate signals linked to cancer advancement, he elaborated. Cardiovascular disease remains a common death cause amongst prostate cancer patients; thus, plant-based diets, benefiting heart health, could play a role in reducing mortality rates.

Chinnaiyan noted unsaturated fats from olive oil, nuts, and seeds lower LDL cholesterol when replacing saturated fats, fostering better heart health. Gomella often advises his patients: “Heart-friendly diets benefit the prostate too.” However, Chinnaiyan clarifies that the food source matters, emphasizing the fiber and nutrients in nuts and seeds along with healthy fats.

The recommendation should accurately target replacing saturated fats with unsaturated ones, as coconut and palm oil, despite being plant-derived, contain high saturated fat levels.

Implications of Findings

“Many men with nonmetastatic prostate cancer survive years or decades post-diagnosis, making cardiovascular health crucial for long-term survival,” stated Chinnaiyan.

Since cardiovascular disease contributes to more deaths than prostate cancer in this study, these findings underscore the importance of comprehensive patient care throughout survivorship.

Gomella highlighted: “Men can influence their prostate cancer outcome post-diagnosis through dietary adjustments. The findings reinforce existing dietary fat recommendations from medical groups.”

Chinnaiyan advised achievable dietary changes like substituting butter or ghee with olive oil and opting for nuts, seeds, or avocados over foods high in saturated fat. Nonetheless, he cautioned that while evidence suggests potential health benefits, these changes don’t guarantee slower cancer progression or extended survival.

Reference: Mucci, L et al. (2026) Dietary Fat Intake and Mortality Among Patients With Nonmetastatic Prostate Cancer. JAMA Network Open. Read more at JAMA Network

For direct inquiries, contact Newsweek editors Kara Dolman and Emma Lee-Sang.