High levels of omega-3, omega-6 may protect against cancer

The study relied on data from more than 250,000 people and found that higher levels of omega-3 and omega-6 fatty acids were associated with a lower risk of developing cancer.

"Higher omega-3 and omega-6 levels were associated with lower rates of cancer," said Yuchen Zhang, lead author of the study and a doctoral student in UGA's College of Public Health. "These findings suggest that the average person should focus on getting more of these fatty acids in their diets."

Participants with higher levels of omega-3s had lower rates of colon, stomach and lung cancer, in addition to lower rates of other digestive tract cancers.

High omega-6 levels led to lower rates of 14 different cancers, including brain, malignant melanoma, bladder and more.

Healthy fats reduce risk of developing 19 types of cancer

The study relied on data from a United Kingdom-based study of over 250,000 people who were followed for more than a decade. Of those participants, almost 30,000 developed some form of cancer during the study period.

Some earlier research drew connections between levels of fatty acids and risk of developing cancer. However, no studies could conclusively determine whether omega-3 and omega-6 fatty acids reduced cancer rates or increased the likelihood of surviving a cancer diagnosis.

Importantly, the benefits of high levels of fatty acids were not dependent on other risk factors like BMI, alcohol use or physical activity.

Fish oil supplements come with a variety of health benefits

Known as "healthy fats," omega-3 and omega-6 fatty acids are essential for human health. They're present in fatty fish, nuts and even some plant oils such as canola oil.

But most Americans probably aren't eating enough of these foods to reach the recommended amounts.

That's why many individuals turn to fish oil supplements. They're one of the most popular dietary pills on the market and for good reason.

Previous studies suggest omega-3 supplements can reduce the risk of developing high cholesterol and lower the risk of heart disease.

Benefits of fish oil may not be one-size-fits-all

But the decision to take the popular fish oil pills isn't one-size-fits-all.

In the present study, for example, the researchers found that high omega-3 levels could be associated with a slightly higher risk of prostate cancer.

"For women, it's an easy decision: Eat more omega-3," said Kaixiong Ye, corresponding author of the study and an associate professor in UGA's Franklin College of Arts and Sciences.

The researchers also saw a stronger beneficial effect of omega-6 in younger participants, particularly women.

Published in the International Journal of Cancer, the study was co-authored by Yitang Sun, a doctoral graduate of UGA's genetics program, and Suhang Song and Ye Shen, of UGA's College of Public Health. Additional co-authors include Nikhil Khankari and Thomas Brenna.