Breast cancer patients (and other, too) do not need to worry about eating moderate amounts of soy foods such as tofu, soy milk, and edamame. The American Institute of Cancer Research/World Cancer Fund (AICR/WCF) review of all research has allayed early fears. Moderate amounts of soy, 1-3 servings per day, are not associated with increased risk.
PositiveTip: Enjoy soy foods in moderation–they are good for you.