I use fitday and I keep a general eye on my calories to make sure I am not really going overboard, but no - I don't have an arbitrary limit that I force myself to stay under. I practice portion control more by eating only until I am satisfied and not going back for more unless I really am still hungry. I have also pretty much eliminated snacking...although that happened more by accident than design - as time went on I didn't need the snacks anymore. I could never stick with the kind of diet where you assign yourself a calorie limit and then stop eating when you hit that number - whether you are still really hungry or not. I don't have that kind of willpower (and don't want to, more's the pity ) But eating low-carb has reduced my apetite, so eating only when hungry, my calories have come down to about 1600/day.