>Cbelle...I'd say give it a try. For me, personally I do the
>zig-zag thing with my calories.
I was thinking of this question this morning, for some reason!, and that's what I was going to suggest. Instead of immediately upping your calories to 1600 or whatever, do a day at 1600, then come back down to 1200. Then a day at 1500, then back down to 1200. Maybe decreasig the 1200 calorie days gradually, so your body has time to get used to the higher calorie intake. You may gain weight at first if this lower calorie regime has slowed your metabolism. But make sure to eat several meals and snacks during the day to help increase metabolism (from the thermic effect of food).
1200 is low, but not as low as some (it's what I've always read as being the rock-bottom lowest calorie intake suggested for dieting), so it might not be as much of a problem as if you were on even fewer calories. Though being on it "long-term" may have affected your metabolism.