A study is published in the journal Cancer Investigation suggests that eating a modest amount of walnuts can protect against prostate cancer.
The researchers at the School of Medicine at the University of Texas Health Science Center San Antonio injected immune-deficient mice with human prostate cancer cells. In three to four weeks, tumours typically start to grow in a large number of these mice. Three of 16 mice (18 percent) eating the walnut-enriched diet developed prostate tumours, compared with 14 of 32 mice (44 percent) on the non-walnut control diet.
The final average tumour size in the walnut-fed animals was roughly one-fourth the average size of the prostate tumours that developed in the mice eating the control diet.
Senior author and professor of cellular and structural biology at the Health Science Center, Russel Reiter, said that the results are promising as there were so few tumours in animals consuming the walnuts and these tumours grew much more slowly than in the other animals. He added that they were surprised by how highly effective the walnut diet was in terms of inhibition of human prostate cancer.
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