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Do you eat walnuts? If not, maybe you should.

I've always known that walnuts are rich in healthy omega-3 fatty acids and antioxidants. They're thought to help prevent diabetes and cardiovascular disease. But their role in breast cancer is new to me.

A new study on mice has found that when the mice that were genetically programmed to develop breast cancer were fed walnuts, the growth of their tumors was slowed by 50 percent.

So, how does this relate to us humans? Tumors were delayed by 3 weeks in the walnut-munching mice, which is the equivalent of 9 years in human-ese. All it took was a little bit of walnuts - the equivalent, for us, of 2 one-ounce servings a day.