Excess Calories
Congrats on your sucess. Don;t go out of your way to have carbs unless you have been advised to do this. They seem to be triggers for overeating/converting back to our old bad ways. Maybe you could increase your veggies but substitute brocolli and others for the potatoes...the spuds are not so good for you... try to vary your meats and don;t eat the fat on the pork chops.
As you continue to lose 1lb a week this is very good. Up the exercise/alter your routine to kick start your body occassionally. It suxs but the slimmer you get the more used to the exercise your body gets and so you have to do more, or more vigorously ! I ask myself each fews days - do I feel healthy - alert or tired, sluggish etc and then up the food or vitamins etc to try to sort it out. Good luck