You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following fatty acids is produced by fermentation of dietary fiber by colonic flora? and explain in detail?
Starch and non-starch polysaccharides are substrates for bacterial fermentation in the large intestine. They produce butyrate and other sho chain fatty acids. These fatty acids are a significant source of fuel for intestinal enterocytes. There is evidence that butyrate also has antiproliferative activity, and so provides protection against colorectal cancer.