It is particularly good for those who do not deal well with carbohydrates since it allows you to almost eliminate this macronutrient from your diet, while still being able to exercise (due to the carb up period). This diet is not a good option however for most individuals who perform a great deal of high intensity exercise however as that type of workout relies much more on glycogen stores (which you will not have much of). Furthermore, if you are looking to gain a lot of muscle mass, again this may not be your best option because the hormonal environment, particularly if you are burning ketones (which is very likely on 3. So, as with any low carbohydrate diet, consider your compliance with higher protein/fat foods along with how you feel physically when eating this way. There is no use trying to force yourself on a diet that you know feels like it's working against you because chances are you will likely just give up and resort back to your old eating habits.