OK by no means am I an expert but I can tell you this from reading these forums and my personal experiences it takes about 3 days for a "cheat" to show so while the scale went down the day after it went up the next day or so...also stay away from those "frankenfoods" they are loaded with hidden carbs (i found this out the hard way)...use the hidden carbs calculator on the side bar to check the accuracy of the label and believe me you will fall out of your chair....That could be part of the problem...another suggestion, as someone else stated is you might need more calories and more fat I keep mine at 70%...also if I am not peeing at least twice an hour I know I am not drinking enough water to lose weight....anyway I hope this helps also use fitday.com to track your foods and think about starting a journal...trust me it all helps when you have to tell the world what you ate etc...
Good Luck !!