Georgia Ede, M.D., has a good article on constipation that is sometimes seen with ketogenic diets. Some think it’s related to low fiber content of the diet. But Dr. Ede found a study that indicates cutting down on fiber consumption helps alleviate constipation! A quote from the good doctor:
If you experience constipation on a ketogenic diet, it is not because you are eating less fiber; it is most likely because you have started eating something that you were not eating before (or a larger amount of something you didn’t eat much of before) that is hard for you to digest. In order to eat a ketogenic diet, which is a high-fat, limited protein, ultra-low-carb diet, most people find themselves turning to high amounts of foods that are notoriously difficult to digest, including nuts, low-starch vegetables such as crucifers, and full-fat dairy products.These foods just so happen to be 3 of the top 5 causes of chronic constipation, regardless of what kind of diet you choose to eat.