If you have really bad carb cravings like I do try the following:
Stock your fridge with pickles, the kind that are in garlic
and make up the following drink:
1 cup of organic maple syrup
1 cup of organic lemon juice
1 teaspoon of cayenne pepper
mix in a 2 liters of water or more
(Its a variation of the Master Cleanser Fast).
instead of using it to fast, when ever I am hungry or feel like I need to cheat beyond my regular meals, I either drink some of the lemonaide or eat a pickle, apparently the sweet and sour affect of both wards off carb cravings.
Im not a physician, but it works for me, and of course I cut out fast food and keep my sweet tooth in check.