Numerous studies have demonstrated a pronounced negative correlation between high-fiber diets and the incidence of colon cancer  For example, the colon cancer rate in Western countries is much higher than in many non-Western countries where people eat more fiber-rich foods, such as fruits and vegetables  Furthermore, in Scandinavia it has been conclusively shown that the higher the colon cancer rate in a given area, the lower the consumption in that area of cereals, which, like fruits and vegetables, are high in fiber
All of this shows that insufficient consumption of fiber causes colon cancer, and sufficient consumption of fiber prevents it
the fiber in fruits and vegetables and the fiber in cereals have cancer-fighting properties to different degrees