6 Cancer-Fighting Superfoods

Broccoli

All cruciferous veggies (think cauliflower, cabbage, kale) contain cancer-fighting properties, but broccoli is the only one with a sizable amount of sulforaphane, a particularly potent compound that boosts the body's protective enzymes and flushes out cancer-causing chemicals, says Jed Fahey, ScD. A recent University of Michigan study on mice found that sulforaphane also targets cancer stem cells—those that aid in tumor growth.

Helps fight: breast, liver, lung, prostate, skin, stomach, and bladder cancers

Your Rx: The more broccoli, the better, research suggests—so add it wherever you can, from salads to omelets to the top of your pizza.

Berries

All berries are packed with cancer-fighting phytonutrients. But black raspberries, in particular, contain very high concentrations of phytochemicals called anthocyanins, which slow down the growth of premalignant cells and keep new blood vessels from forming (and potentially feeding a cancerous tumor), according to Gary D. Stoner, PhD, a professor of internal medicine at The Ohio State University College of Medicine.

Helps fight: colon, esophageal, oral, and skin cancers

Your Rx: Stoner uses a concentrated berry powder in his studies but says a half-cup serving of berries a day may help your health, too.

Tomatoes

This juicy fruit is the best dietary source of lycopene, a carotenoid that gives tomatoes their red hue, Béliveau says. And that's good news, because lycopene was found to stop endometrial cancer cell growth in a study in Nutrition and Cancer. Endometrial cancer causes nearly 8,000 deaths a year.

Helps fight: endometrial, lung, prostate, and stomach cancers

Your Rx: The biggest benefits come from cooked tomatoes (think pasta sauce!), since the heating process increases the amount of lycopene your body is able to absorb.

Walnuts

Their phytosterols (cholesterol-like molecules found in plants) have been shown to block estrogen receptors in breast cancer cells, possibly slowing the cells' growth, says Elaine Hardman, PhD, associate professor at Marshall University School of Medicine in Huntington, West Virginia.

Helps fight: breast and prostate cancers

Your Rx: Munching on an ounce of walnuts a day may yield the best benefits, Hardman's research found.

Garlic

Phytochemicals in garlic have been found to halt the formation of nitrosamines, carcinogens formed in the stomach (and in the intestines, in certain conditions) when you consume nitrates, a common food preservative, Béliveau says. In fact, the Iowa Women's Health Study found that women with the highest amounts of garlic in their diets had a 50 percent lower risk of certain colon cancers than women who ate the least.

Helps fight: breast, colon, esophageal, and stomach cancers

Your Rx: Chop a clove of fresh, crushed garlic (crushing helps release beneficial enzymes), and sprinkle it into that lycopene-rich tomato sauce while it simmers.

Beans

A study out of Michigan State University found that black and navy beans significantly reduced colon cancer incidence in rats, in part because a diet rich in the legumes increased levels of the fatty acid butyrate, which in high concentrations has protective effects against cancer growth. Another study, in the journal Crop Science, found dried beans particularly effective in preventing breast cancer in rats.

Helps fight: breast and colon cancers

Your Rx: Add a serving—a half-cup—of legumes a few times a week (either from a can or dry beans that've been soaked and cooked) to your usual rotation of greens or other veggies.

What Not to Eat: Animal Fats

While researchers are still trying to determine which foods have the most cancer- preventing benefits, we do know what not to eat if you want to protect yourself, says Cheryl Forberg, RD, author of Positively Ageless:

Animal fats: Meat, cheese, and butter can be rich in saturated fat, which has been linked to obesity—a big cancer predictor. Opt for leaner protein sources, such as fish, low-fat dairy, and those good-for-you beans.

What Not to Eat: Processed Meats

A ballpark hot dog or a few slices of bacon once in a while won't kill you, but don't make them a staple of your diet. Some cured meats tend to be high in nitrites and nitrates, preservatives that can, in large amounts, potentially increase your risk of stomach and other cancers.

What Not to Drink: Excessive Alcohol

Stop after one drink! Too much tippling is associated with an increased risk of cancers of the mouth, esophagus, and breast.