For general longevity, weight loss, cost effectiveness, and more, there is a large amount of evidence which indicates a plant based diet is the best approach. the bulk of your diet should consist of things with roots. there are some very interesting positive effects, especially on neurological disorders, that ketogenic style diets seem to have. The nutrition debate is as emotional as it is divisive. to help divine truth from fiction, i sat down with cardiologist joel kahn, md. enjoy!