nutrition guidelines for cancer prevention

Source: American Cancer Society

Eat a healthy diet, with an emphasis on plant sources.

Choose foods and beverages in amounts that help achieve and maintain a healthy weight.

Pay attention to standard serving sizes, and read food labels to become more aware of the number of actual servings you eat.
Eat smaller portions of high-calorie foods. Be aware that "low-fat" or "nonfat" does not mean "low-calorie" and that low-fat cakes, low-fat cookies, and other low-fat foods are often high in calories.
Switch to vegetables, fruits, and other low-calorie foods and beverages to replace calorie-dense foods and beverages such as French fries, cheeseburgers, pizza, ice cream (please say it ain't so!!!), doughnuts and other sweets, and regular sodas.
When you eat away from home, choose food low in calories, fat, and sugar, and avoid large portion sizes.
Eat 5 or more servings of vegetables and fruits each day.

Include vegetables and fruits at every meal and for snacks.
Eat a variety of vegetables and fruits each day.
Limit French fries, snack chips, and other fried vegetable products.
Choose 100% juice if you drink vegetable or fruit juices.
Choose whole grains over processed (refined) grains and sugars.

Choose whole grain rice, bread, pasta, and cereals.
Limit intake of refined carbohydrates (starches), such as pastries, sweetened cereals, and other high-sugar foods.
Limit intake of processed meats and red meats.

Choose fish, poultry, or beans instead of beef, pork, and lamb.
When you eat meat, choose lean cuts and eat smaller portions.
Prepare meat by baking, broiling, or poaching, rather than by frying or charbroiling.
If you drink alcoholic beverages, limit your intake.

People who drink alcohol should limit their intake to no more than 2 drinks per day for men and 1 drink a day for women. The recommended limit is lower for women because of their smaller body size and slower breakdown of alcohol. A drink is defined as 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of 80-proof distilled spirits.

Alcohol is a known cause of cancers of the:

mouth
pharynx (throat)
larynx (voice box)
esophagus
liver
breast
Alcohol may also increase the risk of colon and rectum cancer.

Source: American Cancer Society