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Colon Cancer Blog: Dietary Fiber Does Not Reduce Risk Of Colorectal

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Dec 14, 2005

Dietary Fiber Does Not Reduce Risk Of Colorectal Cancer

Dietary Fiber Does Not Reduce Risk Of Colorectal
In an analysis combining data from 13 studies, high intake of dietary fiber was not associated with reduced risk of colorectal cancer, according to a study in the December 14 issue of JAMA.

Dietary fiber has been hypothesized to reduce the risk of colorectal cancer, according to background information in the article. However, the results of numerous epidemiological studies have been inconsistent. Ecological correlation studies and many case-control studies have found an inverse association between dietary fiber intake and risk of colorectal cancer. But most prospective cohort studies have found no association between dietary fiber intake and risk of colorectal cancer or adenomas (precursors of colorectal cancer), and randomized clinical trials of dietary fiber supplementation have failed to show reductions in the recurrence of colorectal adenomas.

Yikyung Park, Sc.D., of the Harvard School of Public Health, Boston, and colleagues evaluated the association between dietary fiber intake and risk of colorectal cancer by reanalyzing the primary data from 13 prospective cohort studies (Pooling Project of Prospective Studies of Diet and Cancer). The pooled analysis included 725,628 men and women who were followed-up for 6 to 20 years across studies.

During the follow-up, 8,081 colorectal cancer cases were identified. Among the studies, median (midpoint) energy-adjusted dietary fiber intake ranged from 14 to 28 g/d in men and from 13 to 24 g/d in women. The major source of dietary fiber varied across studies with cereals as a major contributor to dietary fiber intake in the European studies, and fruits and vegetables as the main sources in the North American studies.


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Colorectal cancer
Colorectal cancer is a malignant tumor that arises from the inner wall of the large intestine or rectum. Colorectal cancer is the third commonest cancer diagnosed in the United States. Each year over 100,000 people are diagnosed with colorectal cancer in the United States. Most, of these cancers develop from growths in the colon called polyps. Removal of these polyps can prevent colon cancer.

Colon Cancer Blog: Dietary Fiber Does Not Reduce Risk Of Colorectal

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