Pondering going below 1200 kcal a dayShe

I have to go to 900 a day to lose a pound a week.  I maintain at 1400 and weigh 136.  I have never gotten to starvation  mode.  For me that would have when I got to about 70 pounds.

Did it take lots of trail and error to find these # that work for you 

It took a long time.  I tried Weigh****chers, working out four hours a day, crash diets, protein shakes and could not get rid of regain.  Then I started using My Fitness Pal, counting everything I ate and weighing myself everyday.  I learned my weight will come off at 900 by a pound a week and that at 1400 I will maintain my 136.