The food you eat is among the most significant factors affecting your genes and pushing them toward cancer by causing mutation or disruption in their function. That is, what you eat can either prevent cancer and other chronic illnesses or help cause them.
Dharma Singh Khalsa (2003). “Food As Medicine: How to Use Diet, Vitamins, Juices, and Herbs for a Healthier, Happier, and Longer Life”, p.13, Simon and Schuster