Eating a diet high in fiber, particularly from cereal and whole grains, is associated with a reduced risk of colorectal cancer, according to a meta-analysis that researchers said integrates all available evidence.
Intake of dietary fiber and whole grains is known to help protect against cardiovascular disease, but its association with colorectal cancer risk has been less clear. Although theories tying dietary fiber to a reduced risk of colon cancer have been around since the 1970s, the researchers said, studies attempting to explain the association have not produced consistent results.
The researchers said the results of the new study, which appeared Friday on the website of BMJ, provide further support for public health recommendations to increase fiber intake, particularly cereal fiber and whole grains, to help prevent colorectal cancer. Whole grain foods include whole grain breads and cereals, oatmeal, brown rice and porridge.
However, the authors stressed that further studies are needed to clarify the results for different types of fiber and subsites within the colorectum, and in populations with different lifestyles and dietary characteristics.
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