The causes of colon cancer include some genetic factors or hereditary causes. I know there are families who are more prone to getting colonic polyps and therefore getting colon cancer. In addition, we know that obesity or a sedentary lifestyle, as well as some dietary factors such as a high protein or high fat diet, can also cause a high incidence of colon cancer. Many studies have shown that high fat and high animal protein diets can lead to higher incidents of colon cancer. The exact reason for this is not clear, but we know that people who have a high high dietary intake of fat and protein from animal protein do have a higher incidence of colon cancer, overall.