This happens to me ocassionally too. It's a theory (albeit a well-supported one) that after awhile on LC (or any hypocaloric diet) the body often responds by entering starvation mode...a common cause of stalls.

It is believed that when the body enters this state, leptin levels decrease and you no longer burn stored body fat for energy. Your body slows down metabolic processes to hang onto your fat store...some peripheral effects include a decrease in thyroid production and adrenal disturbances.

Bodybuilders have been aware of this for awhile and, through a bit trial-and-error and scientific self-study, they have determined that a periodic "refeed" can get leptin levels back up, which in turn reignites the burning of stored body fat. They also figured out that the ideal "refeed" is a high carb/high glucose/low fat for 24-48 hours of 10-15% more calories than your maintenance level.

They specifically mention high glucose because it quickly fills liver and muscle glycogen stores, which are usually depleted on a low carb regimen. Apparently glycogen levels regulate leptin in some way. So you'll often see people mention their refeeds consist of things like licorice, soda, sweet-tarts, sugared cereal, etc. and not stuff like pasta, pizza, bread, etc.

Refeeds seem to cause a 2-4lb weight gain in most people, but its really a water change (primarly in glycogen carrying plasma, I assume) and not 2-4lbs of body fat. Within a week of returning to low carb, most of the glycogen is depleted and the 2-4lbs are gone. Often, 3-5lbs may be gone...in addition to depleting the glycogen the letin may allow the body to burn a pund or so of stored body fat.

So it seems, quiote by accident, you may have discovered how to raise your leptin levels...BY CHEATING!