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Fruits and Vegetables Fight Off Cancer

4/16/2007      

MONDAY, April 16 (HealthDay News) -- If you want to reduce your risk of several common types of cancer, help may be no farther away than your kitchen.

A trio of new studies presented at the annual meeting of the American Association for Cancer Research on Sunday found that vegetables and fruits help lower your chances of getting head and neck, breast, ovarian and pancreatic cancers.

One of the studies even found that just one additional serving of vegetables or fruits could help lower the risk of head and neck cancer. Still, the more fruits and vegetables you can consume, the better.

"Those who ate six servings of fruit and vegetables per 1,000 calories had a 29 percent decreased risk relative to those who had 1.5 servings," said Neal Freedman, a Cancer Prevention Fellow in the division of Cancer Prevention at the National Cancer Institute and author of one of the studies.

Freedman looked at how the fruit and vegetable intake compared to the incidence of head and neck cancer is 490,802 adults. During the five-year study period, 787 people were diagnosed with head and neck cancers.

After adjusting the data to account for smoking and alcohol use -- known head and neck cancer risk factors -- the researchers found that those who consumed the most fruits and vegetables had the lowest risk for head and neck cancers. Vegetables appeared to offer more cancer prevention than fruits alone did.

Adding just one serving of fruit or vegetables per each 1,000 calories consumed daily resulted in a 6 percent reduction of risk, Freedman said.

"Quitting smoking and reducing alcohol use protects against head and neck cancer. Our results suggest that increasing consumption of fruits and vegetables may also contribute to reduced head and neck cancer risk, and add support to current dietary recommendations to increase fruit and vegetable consumption," Freedman noted.

"I think Americans fall pretty short of the recommendations [for fruit and vegetable consumption]," said Tara Miller, program manager for the Center for Corporate Wellness at New York University Medical Center in New York City. "So, it's good news that only an extra serving a day could make a difference."

In the second study, researchers at the University of California, Los Angeles, conducted lab experiments to see if broccoli and soy protein offered any protection against more aggressive breast and ovarian cancers.

When consumed together, digesting broccoli and soy forms a compound called diindolylmethane (DIM). In the lab experiments, the researchers found that DIM could affect the motility of breast and ovarian cancer cells, which could help keep cancers from spreading.

Miller said one concern about soy is that it may be a problem for people with estrogen-fueled cancers, because soy acts like estrogen in the body. She said soy is a nutritious, healthy food, but she recommends eating it in moderation.

The third study looked at the diets of 183,518 people from California and Hawaii, and compared their intake of flavonols to their risk of pancreatic cancer. Flavonols are protective compounds found in fruits and vegetables, such as onions, apples, berries, kale and broccoli.

Those who had the highest consumption of flavonols reduced their risk of pancreatic cancer by 23 percent, scientists from the Cancer Research Center of Hawaii found. The benefit was even greater for people who smoked. Smokers with high levels of flavonols reduced their risk of pancreatic cancer by 59 percent.

"These studies give lots more ammo to what we've been saying -- eating a large variety of plant-based foods is one of the best things you can do for your health in terms of cancer prevention," said Melanie Polk, the nutrition education adviser for the American Institute for Cancer Research.

"If you're eating three or four servings daily, don't think that eating one or two additional servings won't make a difference, though working toward a goal of five to nine servings a day makes sense," Polk said.

She suggested visiting farmer's markets or even taking more time to explore the options available in your local grocery store. Additionally, Polk said you should try to find new recipes for vegetables. "There are lots of ways to fix them that really taste good," she said. "Don't just settle for a boiled pot of kale."

More information

Get the American Cancer Society's recommendations on food and fitness.

SOURCES: Neal Freedman, Ph.D., cancer prevention fellow, National Cancer Institute, Bethesda, Md.; Tara Miller, M.S., R.D., program manager, Center for Corporate Wellness, New York University Medical Center, New York City; Melanie Polk, R.D., nutrition and education adviser, American Institute for Cancer Research, Rockville, Md.; April 15, 2007, presentations, American Association for Cancer Research annual meeting, Los Angeles

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