Explain the Dietary fibre and colon cancer?

The relationship between colorectal cancer and dietary fibre remains complex. Although a cause-and-effect relationship between fibre and colon cancer has not been established, the majority of epidemiological studies (descriptive, case-conk01 and cohort) support an inverse relationship between consumption of vegetables and fruits and colorectal cancer risk. Fruits, vegetables and grains, in addition to fibre, also contain a variety of anticarcinogenic compounds, which may contribute to this protective effect. Epidemiological evidence that whole grains protect against colorectal cancer is also strong. However, evidence from prospective, large epidemiological studies for protective effect of dietary fibre on colorectal cancer is not strong.