Relationship between gut microbiota and colorectal cancer: Probiotics as a potential strategy for prevention

•Characteristics of gut microbiota correlate with CRC development and prevention.•The gut microbiota can generate carcinogenesis factors and chronic inflammation that influence risk of CRC.•Gut microbiota and probiotics produced by fermented foods prevent CRC.•Metabolic activities for CRC prevention in gut microbiota and probiotics are illustrated.