To prevent cancer, Eat a healthy diet, with an emphasis on plant foods.

http://m.cancer.org/acs/groups/cid/documents/webcontent/002577-pdf.pdf

The following is extracted from "American Cancer Society Guidelines on Nutrition and Physical Activity for Cancer Prevention"

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• Eat a healthy diet, with an emphasis on plant foods.

• Choose foods and drinks in amounts that help you get to and maintain a healthy weight.

• Limit how much processed meat and red meat you eat.

• Eat at least 21⁄2 cups of vegetables and fruits each day.

• Choose whole grains instead of refined grain products.