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Garlic

Phytochemicals in garlic have been found to halt the formation of nitrosamines, carcinogens formed in the stomach (and in the intestines, in certain conditions) when you consume nitrates, a common food preservative, Béliveau says. In fact, the Iowa Women's Health Study found that women with the highest amounts of garlic in their diets had a 50 percent lower risk of certain colon cancers than women who ate the least.

Helps fight: breast, colon, esophageal, and stomach cancers

Your Rx: Chop a clove of fresh, crushed garlic (crushing helps release beneficial enzymes), and sprinkle it into that lycopene-rich tomato sauce while it simmers.

Next: Beans