A new study shows high fat diets are to blame for 80 percent of colorectal cancers, and that includes healthy fats.
Researchers report in the journal Cell they found fatty diets stimulate tumor growth by activating a molecular pathway that feeds abnormal cells.
Colorectal cancer is the third most common cancer in the United States.
In a study on mice, the scientists consistently found a rapid growth of aggressive, cancerous cells in the mice who were fed a high-fat diet, while their peers on a normal diet hardly saw any change.
The team says the key element is a high level of vitamin A that unlocks a pathway that makes the mutation of normal cells easier.