Eating walnuts may change gut bacteria in a way that suppresses colon cancer, researchers led by
A team of researchers from
"Our results show for the first time that walnut consumption may reduce colon tumor development," said Principal Investigator Dr.
Walnuts are packed with compounds known to be important nutritionally. They have the most polyunsaturated fatty acids of all the commonly eaten tree nuts, as well as the highest ratio of omega-3 to omega-6 fatty acids, and high levels of a form of Vitamin E with anti-cancer properties.
But walnuts are not merely the sum of their chemical parts, and it may be as a whole food that they pack the most significant anti-cancer punch against colon cancer, the third most common cancer in the world. Other studies have shown walnuts have promise warding off diseases connected to diet and lifestyle, including heart disease, diabetes and neurological disorders.
Rosenberg, a cancer researcher and professor of medicine at
Interestingly, male mice fed the Western diet fortified with 10.5 percent walnuts showed the greatest decrease in colon tumors compared with mice fed no walnuts.
To figure out why walnuts were beneficial, the
Because the studies were done only in mice, more testing needs to be done in humans before walnuts can be unequivocally recommended as a cancer-prevention agent. Rosenberg's group is working with a nutritionist and surveying human colonoscopy patients about their diets as part of a longer term study in humans.
However, Rosenberg isn't waiting for the final word. Even right now, he says, "I try to eat walnuts every day."
He adds: "We're excited about future studies where we will be able to look at food consumption patterns to see how these results apply to humans."
This research was supported in part by the
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