Eating 3 grams of carbs per pound of body weight for a day, every 10 to 12 days will lead your body to believe that the caloricreduction is over, thus preventing drasticreduction of thyroid hormone levels.
In fact, drasticreductions in caloric intake reduce leptin levels, faster than could be explained by body fat losses (the same goes for overfeeding, which increase leptin levels faster than can be explained by body fat gain).