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.
Read the whole enchilada for her tips on countering constipation. Another trick that works for many folks is cabbage soup.
A well-designed ketogenic diet is a great weight to reduce elevated blood sugars. Don’t let constipation dissuade you.
Diabetic Mediterranean Diet 