A recent study by The University of Texas Health Science Center San Antonio (UT) showed that eating moderate amounts of walnuts can stop the growth of prostate cancer cells. The results were published in the July 2013 issue of Cancer Investigation. It is known that if prostate cancer cells are injected into immunodeficient rats, the cancer cells will grow rapidly in these immunodeficient rats after about three to four weeks. And it was Dr. Russel Reiter of the University of Texas who wanted to compare the growth rate and size of cancer cells in rats fed a walnut-rich diet (experimental group) and rats fed a walnut-free diet (control group). The study found that in the experimental group with the walnut-rich diet, only 3 of 16 rats (about 18 percent) had prostate cancer cell growth, while in the control group, 14 of 32 rats (about 44 percent) had prostate cancer cell growth. Moreover, the size of the cancer tumors in the experimental group on walnut chow was only a quarter of the size of the control group! The researchers said that the results of previous rat tests, which have confirmed that walnut chow can stop the growth of breast cancer cells in rats, and the results of this study, which proved that walnut chow can also stop the growth of prostate cancer cells, said study co-author Dr. W. Elaine Hardman, who said that the available evidence suggests that a moderate walnut diet can block, prevent or delay the growth of prostate and breast cancer cells. As for the proportion of walnuts in the dietary mix, Dr. Russel Reiter noted that, converted to the human diet, consuming about 2 ounces (1 ounce equals about 28.35 grams) daily would be sufficient.