Eat more fish and poultry, less red meats and go for low-fat dairy products. Avoid smoked foods. Smoke tastes good and is an excellent preservative but it is poison to your body. Eliminate all oils which are not monounsaturated. The best, most healthy and cancer fighting is Extra Virgin Olive Oil.
Canola oil is also good.
Studies have shown olive oil helps in the prevention of cardiovascular disease, reduces and balances cholesterol levels, has a cleansing effect on the digestive track, promotes healthy cell development and offers protection against many common ailments including arthritis and cancer. Olive oil can be used to replace all your other oils including butter, margarine and cooking oils. And it is good for you. Work more cereals and whole grains into your diet. Again, there are supplements available if needed.