Although making healthy selections at the grocery store and at mealtime can’t guarantee cancer prevention, it may help reduce your risk. Consider these guidelines:

Eat plenty of fruits and vegetables. Base your diet on fruits, vegetables and other foods from plant sources — such as whole grains and beans.
Limit fat. Eat lighter and leaner by choosing fewer high-fat foods, particularly those from animal sources. High-fat diets tend to be higher in calories and may increase the risk of overweight or obesity — which can, in turn, increase cancer risk.
If you choose to drink alcohol, do so only in moderation. The risk of various types of cancer — including cancer of the breast, colon, lung, kidney and liver — increases with the amount of alcohol you drink and the length of time you’ve been drinking regularly.
Source: Mayo Clinic