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The association between dietary fiber intake and colorectal cancer risk is unclear. In a meta-analysis of 25 prospective observational studies that involved nearly 2 million people, investigators assessed this association.
Participants' daily fiber intake ranged from 6 to 21 g for total fiber, 2 to 16 g for fruit fiber, 2 to 17 g for vegetable fiber, 3 to 17 g for cereal fiber, and 1 to 4 g for legume fiber. Daily whole grain intake ranged from 61 g to 128 g. Participants with high total fiber intake had 12% lower risk for colorectal cancer than those with low total fiber intake. When intake was analyzed by fiber type, people with high cereal fiber intake had 10% lower risk, and those with high whole grain intake had 21% lower risk, than peo…