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What Causes, Prevents Colon Polyps

Vitamin D Shines in New Study; Smoking Worse Than Expected
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WebMD Health News

Dec. 9, 2003 -- In about five minutes each morning, you may be able to effortlessly and substantially reduce your risk of the nation's second most deadly cancer: Just take an aspirin, a multivitamin, and eat a bowl of fiber-packed cereal with some milk. If you want even more protection, add a 10-minute walk on sunny days without wearing sunscreen.

So suggest the results of the one of the largest and most comprehensive studies to date on factors that raise and lower the risk of colon cancer. In this new report, vitamin D shines -- it's associated with a one-third reduced risk of serious colon polyps that often lead to cancer in men getting at least 645 IUs of this nutrient each day.

"That's what you'll find in a multivitamin supplement and a small glass of milk," says lead investigator David A. Lieberman, MD, chief of gastroenterology at the Portland VA Medical Center. "Other vitamins also seem to have a protective effect, but our study suggests a stronger protective effect from vitamin D."

That's because vitamin D keeps cells from over-proliferating and multiplying too quickly. "Cells in the lining of the colon are constantly turning over and reproducing," Lieberman tells WebMD. "A drug that could prevent that, theoretically, could prevent cell mutations that can lead to cancer."

A similar protective effect -- about one-third reduced risk of these polyps -- was noted in men who took a daily aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen or naproxen. Just over 4 grams of cereal fiber a day, which is less than one-quarter ounce, also offered the same degree of protection. -->

The Value of Vitamin D

Taking a multivitamin -- most of which contain 400 IUs of vitamin D -- was associated with reducing polyp risk by about 25%. These multivitamins also contain adequate amounts of calcium, folate, vitamin E, and selenium, which Lieberman also found to help lower polyp risk, "but not as much as vitamin D," he says. In order to get the full protective effect of vitamin D -- at 645 IU -- add a small glass of milk daily to the multivitamin.

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