A team of researchers at IRB Barcelona has discovered that a common type of fat found in palm oil may help some cancers spread more easily throughout the body.
The finding offers new clues about why certain cancers become more dangerous and may eventually lead to new treatments designed to stop cancer from spreading.
Cancer becomes especially difficult to treat when it spreads beyond its original location. This process is known as metastasis.
While many cancers can be successfully treated when they are found early and remain in one place, metastatic cancer is much harder to control. In fact, most cancer-related deaths occur because cancer has spread to vital organs rather than because of the original tumor itself.
Scientists have spent many years trying to understand exactly what allows cancer cells to break away from a tumor, travel through the body, and establish new tumors in other organs. The new study suggests that certain fats in our diet may play an important role in this process.
The researchers focused on palmitic acid, a fatty acid that is naturally found in palm oil and many other foods. Palmitic acid is also produced naturally by the human body and stored in body fat. It is one of the most common saturated fatty acids in the human diet.
To investigate its effects, the scientists studied oral cancer and melanoma, a serious form of skin cancer. Melanoma develops in the cells that produce skin pigment and can become highly aggressive if it spreads. Oral cancer affects tissues inside the mouth and can also become life-threatening when it metastasizes.
The researchers found that exposure to palmitic acid increased the ability of cancer cells to spread to other parts of the body. This effect was seen in both types of cancer studied. The finding suggests that palmitic acid may help cancer cells become more aggressive and better able to form new tumors elsewhere in the body.
One of the most interesting discoveries was that not all fats behaved the same way. The scientists compared palmitic acid with other common fatty acids. Oleic acid, which is abundant in olive oil, did not increase cancer spread. Linoleic acid, found in foods such as flaxseeds and many plant oils, also did not produce the same effect.
This difference is important because it shows that cancer cells do not respond to all dietary fats in the same manner. Some fats may have little effect on cancer spread, while others may trigger biological changes that make cancer more dangerous.
Perhaps the most surprising result was that the effects of palmitic acid continued long after exposure ended. In the study, mice were exposed to palmitic acid for a relatively short period. Even after the fatty acid was removed from their diet, cancer cells remained highly capable of spreading.
The researchers discovered that this happened because palmitic acid caused lasting changes in the way cancer cells behaved. These changes involved a process known as epigenetics. Epigenetic changes do not alter the DNA sequence itself. Instead, they affect how genes are switched on or off.
In this case, exposure to palmitic acid appeared to reprogram cancer cells. The cells developed a stronger ability to communicate with surrounding tissues, interact with nearby cells, and move through the body. These changes helped them survive and spread more effectively.
The findings suggest that palmitic acid may leave a long-lasting “memory” in cancer cells, allowing them to remain aggressive even after the fatty acid is no longer present. This helps explain why a short exposure could have effects that continue for a long time.
Despite the concerning findings, the research also brought encouraging news. The scientists identified specific biological pathways involved in the changes triggered by palmitic acid. By targeting these pathways, they were able to block some of the processes that help cancer spread.
Researchers are now working on treatments designed to interfere with these cancer-promoting changes. The goal is to develop therapies that can prevent metastasis by stopping cancer cells from using the mechanisms activated by palmitic acid. Future clinical trials will be needed to determine whether these approaches can help patients.
The study does not mean that people should immediately eliminate all foods containing palmitic acid. Nutrition and cancer are highly complex subjects. Scientists caution that much more research is needed before specific dietary recommendations can be made.
Human diets contain many different nutrients that interact in complicated ways, and the relationship between food and cancer is rarely simple.
However, the research does provide important evidence that certain fats may influence how cancer behaves. Understanding these effects could help scientists develop better ways to predict cancer progression and design new treatments aimed at preventing metastasis.
Professor Salvador Aznar-Benitah, who led the research, believes the findings open a new area of cancer research. By learning how nutrients affect cancer cells at the molecular level, scientists may uncover new vulnerabilities that can be targeted with future therapies.
Although many questions remain unanswered, the study highlights the growing understanding that diet, metabolism, and cancer are closely connected. As researchers continue exploring these links, new opportunities may emerge to improve cancer prevention and treatment.
If you care about cancer, please read studies that a low-carb diet could increase overall cancer risk, and vitamin D supplements could strongly reduce cancer death.
For more information about health, please see recent studies about how drinking milk affects the risks of heart disease and cancer and results showing higher intake of dairy foods linked to higher prostate cancer risk.
The study was published in the journal Nature.
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