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Although recent studies questioned the hole of high fiber and low fat diets in preventing colorectal cancer, healthy habits are the most secure way to prevent a series of other diseases - if not preventing you from having cancer, it sure will be useful for a lot of other situations. Inflammatory bowel diseases (such as Crohn and, specially, ulcerative colitis) are very well known risk factors for colorectal cancer. In fact, patients with ulcerative colitis must be submitted to a very close follow-up because of the high incidence of malignant colorectal lesions. Other syndromes than Familial Adenomatous Polyposis Syndrome, as Gardner, Peutz-Jeghers, Conkrite-Canada, Torres and Lynch, can course with colorectal cancer. A great prevalence of cancer in a given family generate the suspicion of oncogenes. In such cases, one must always keep in mind the possibility of colorectal carcinomas