Walnuts may help fight prostrate cancer
Washington: Walnut consumption may help slow the growth of prostate cancer in mice, a new study has found.
What’s more, the nut has beneficial effects on multiple genes related to the control of tumour growth and metabolism, UC Davis and the U.S. Department of Agriculture Western Regional Research Center in Albany, Calif. have found.
The study, by Paul Davis, nutritionist in the Department of Nutrition and a researcher with the UC Davis Cancer Center, announced the findings at the annual national meeting of the American Chemical Society in San Francisco.
Davis said the research findings provide additional evidence that walnuts, although high in fat, are healthful.
"This study shows that when mice with prostate tumors consume an amount of walnuts that could easily be eaten by a man, tumor growth is controlled," he said. "This leaves me very hopeful that it could be beneficial in patients."
Many clinical studies have demonstrated that eating walnuts -- rich in omega-3 polyunsaturated fats, antioxidants and other plant chemicals -- decreases the risk of cardiovascular disease.
In the latest study, Davis fed a diet with whole walnuts to mice that had been genetically programmed to get prostate cancer. After 18 weeks, they found that consuming the human equivalent of 2.4 ounces of walnuts per day resulted in significantly smaller, slower-growing prostate tumours compared to mice consuming the same diet with an equal amount of fat, but not from walnuts.
They also found that not only was prostate cancer growth reduced by 30 to 40 percent, but that the mice had lower blood levels of a particular protein, insulin-like growth factor (IGF-1), which has been strongly associated with prostate cancer.
Additionally, Davis and his research colleagues looked at the effect of walnuts on gene activity in the prostate tumours using whole mouse gene chip technology, and found beneficial effects on multiple genes related to controlling tumour growth and metabolism.
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