Can Diet Fuel Cancer Spread? New Study Links Palm Oil Fat to Long-Term Tumor Aggression

Redacción HC
04/09/2023

What if a brief change in your diet could silently prepare cancer cells to spread—even after the dietary shift ends? That’s exactly what a major new study published in Nature suggests. Scientists have discovered that dietary palmitic acid, a saturated fat abundant in palm oil, triggers a lasting pro-metastatic memory in cancer cells—a change that persists even when the fat is no longer present.

This startling revelation highlights how dietary choices can influence the metastatic potential of tumors through a combination of metabolic, epigenetic, and neural mechanisms, offering critical insights for both cancer prevention and treatment.

What the Study Investigated: Can a Fatty Acid Program Tumors to Spread?

Metastasis, the process by which cancer spreads from its primary site to distant organs, is the leading cause of cancer-related deaths. While links between fat metabolism and cancer progression have been reported, this new study, led by researchers at IRB Barcelona and collaborators from the U.S., sought to answer a more specific and troubling question:

Can a dietary component like palmitic acid “reprogram” tumor cells in a way that promotes metastasis long after it’s been consumed?

Palmitic acid (PA) is the most common saturated fatty acid in the Western diet and is present in high concentrations in palm oil—widely used in processed foods across the globe.

From Mouse Models to Molecular Mechanisms: How the Study Was Conducted

The team used mouse models of oral carcinoma and melanoma, feeding them diets either enriched with palmitic acid or without it. They then transplanted tumors from these mice into others that received no further dietary fat, aiming to test the persistence of any metastatic behavior.

Key techniques included:

• Cellular assays for cancer stem cell markers (CD44) and fatty acid transporter CD36.
• ChIP-seq analysis of histone modification H3K4me3 to identify epigenetic changes.
• RNA sequencing (bulk, single-cell, spatial) to detect gene expression patterns.
• Functional experiments blocking Schwann cell activity using matrix degradation and gene inhibition (e.g., EGR2, galanin).

Their integrative methodology allowed them to trace the entire cascade from dietary exposure to cellular behavior and tumor progression.

Key Findings: A Lasting, Fat-Induced “Memory” That Drives Metastasis

1. A Prometastatic Memory That Persists

Even brief exposure to dietary palmitic acid led to increased metastatic spread to lungs and lymph nodes, and this aggressive behavior persisted in subsequent tumor generations—even without continued exposure to the fat.

2. The Role of CD36

CD36, a fatty acid transporter protein, was crucial for this effect. Tumors without CD36 failed to develop the prometastatic phenotype, implicating it as a potential therapeutic target.

3. Epigenetic Reprogramming

Tumors exposed to PA showed enhanced H3K4me3 marks—associated with active gene expression—on promoters of neural-related genes. These changes remained stable over time, indicating a long-lasting epigenetic “memory.”

4. Activation of Schwann Cells

Gene expression data revealed increased innervation and activation of Schwann cells, which are part of the peripheral nervous system. These cells created a pro-regenerative extracellular matrix (ECM) that appears to assist in metastatic spread.

5. Therapeutic Disruption Reduces Spread

Intervening in this Schwann cell matrix—either by degrading it or inhibiting key mediators like EGR2 and galanin—reduced metastatic capacity, confirming their active role.

Practical Implications: Food for Thought in Cancer Prevention and Treatment

For Nutrition and Public Health

• The findings support reducing intake of saturated fats, especially from palm oil, in populations at risk of cancer.
• Diet may not just influence tumor growth—it may also condition tumors for future behavior.

For Oncology and Therapy

• Targets like CD36, Schwann cell ECM components, and neural gene regulators (EGR2, galanin) offer novel points for therapeutic intervention.
• Dietary history could become a key consideration in personalized cancer treatment planning.

For Epigenetics and Cancer Biology

• The study introduces a new concept of diet-induced epigenetic “memory” in cancer cells—merging metabolic exposure with long-term tumor behavior.
• Further human studies are needed, but the preclinical evidence is strong enough to guide future nutritional guidelines in cancer care.

Why It Matters: A Call for Integrating Diet into Oncology

With palm oil consumption growing globally, especially in processed foods and fast-food industries, this study’s findings carry major public health implications. Regulatory bodies and health organizations may need to reevaluate guidelines around dietary fats—not just for cardiovascular risk, but also for oncological outcomes.

Moreover, the research suggests that early dietary interventions could shape tumor dynamics even before clinical detection, highlighting the importance of preventive care and interdisciplinary cancer management that includes dieticians, geneticists, and oncologists alike.

Conclusion: Your Diet Might Leave a Lasting Mark on Cancer

This study provides compelling evidence that a dietary fat can leave a “memory” in tumors, increasing their likelihood to metastasize even after the dietary exposure has ended. From the fat molecule to Schwann cells and gene expression, the pathways are intricate—but the message is simple: what we eat matters profoundly in the fight against cancer.

As scientists continue to uncover how lifestyle and biology intertwine, one thing is clear: our plates may be as powerful as our prescriptions.

Topics of interest

Health Biodiversity