Ok, so here's what I found about weight loss trends. So in the beginning you really should lose a little water weight if you change your diet even just a little. But then on the reg (and im looking at my fitday readout here) I get four days of losing(if im eating right) and then it slows for two days, and then it drops again. A lot of it feels like it has to do with water, so i guess the lesson i learned was to stay away from salt along with how the diet works, and to accurately measure my calories. There was a NEJM article about how we underestimate our calories by 30% when logging, so I would guess that your 1200 may be a lot higher if you arent carefully logging all of the items. I suggest FitDay, its really amazing (if you stick with it) and can objectify literally everything you do. Short answer? Its your diet.