Low-carbohydrate books continue to be some of the biggest selling publications in the United States. However, what are the similarities and differences between some of the most popular books? This overview of what some of these books advocate or discourage is important to better facilitate the discussion between the health professional and the patient interested in some of these methods. Regardless of the low-carbohydrate diet discussed with patients and whether or not health professionals agree or disagree with this approach, it is imperative that health professionals at least learn the basics of some of the more popular diets to facilitate better communication between the practitioner and patient.