January 25/Folsom, Calif./PRNewswire -- Prostate cancer is a major health concern for men that strikes approximately one in six men and is a leading cause of male cancer deaths in the United States. New research offers hope in this fight; according to findings published in the British Journal of Nutrition, walnuts may help reduce prostate cancer risk. Researchers at the University of California -- Davis and the U.S. Department of Agriculture Western Regional Research Center in Albany, Cal., found that prostate tumors in mice fed the human equivalent of 3oz. per day of walnuts were approximately 50% smaller and grew 30% slower than prostate tumors in control mice. In addition to lower plasma Insulin-like growth factor 1 (IGF-1), a biomarker strongly associated with prostate cancer, walnut fed mice had lower LDL (bad) cholesterol as well as distinct differences in their liver metabolome, a chemical inventory of what the liver -- a major source of both IGF-1 and cholesterol -- is doing.

"These results make me very hopeful that walnuts may be beneficial both in terms of avoiding cancer and slowing cancer growth and therefore should be included in a balanced diet with lots of fruits and vegetables," states a UC -- Davis release. “Walnuts are widely recognized as being heart-healthy, and now, this research in prostate cancer along with previous published research from Marshall University reporting that walnuts slow the development and growth of breast cancer tumors in mice, show that walnuts maybe a weapon in the fight against cancer as well.”

Lead researcher Dr. Paul Davis believes the findings are not a result of one isolated component, but due to the multiple ingredients found in walnuts that work together. "Walnuts are a whole food that provides a rich package of healthful substances, including omega-3 fatty acids, gamma tocopherol (a form of vitamin E), polyphenols, and antioxidants. These likely then work synergistically," states Davis.

Karen Collins, RD a nutrition consultant for American Institute for Cancer Research (AICR), suggests these findings offer further support to include plant-based foods, such as walnuts, regularly in the diet. "Nutrition is a key factor in the prevention and treatment of cancer," states Collins. In fact, "it is estimated that we can prevent about 11% of prostate cancer cases in the Unites States. A healthy diet, participating in regular physical activity and maintaining a healthy weight form a three-part strategy recommended to reduce prostate and other cancers."

 From the January 25, 2012, Prepared Foods' Daily News.