One day at a time

Well....today was a good day.  So far though I've only had 604 calories in.  I know that probably isn't necessarily good, but I got into an argument with my fiance' and that just completely destroyed my appetite for dinner.  So to calm my nerves I went for a long walk which burned about an additional 298 calories.  That left me with an overall calorie deficit of 1500 for the day.  As long as I keep my calories in the 1200 range I do well.  Yesterday my morning weight was 174.2.  Today my weight was 170.8.  I know that most of that was water weight having kept the calories in check and going for a jog for 30min, but it would be great if I could keep up that pace.