The American Cancer Society has the following guidelines for diet. Maintain a desirable body weight. Eat a varied diet. Include a variety of both vegetables and fruits in the daily diet. Eat more high-fiber foods, such as whole-grained cereals, legumes, vegetables and fruits. Cut down on total fat intake. Limit consumption of alcoholic beverages, if you drink at all. Limit consumption of salt-cured, smoked and nitrite-preserved foods.