The number of calories you should be eating, as I have read, depends on your bmr. 1200 is the lowest amount you should eat if you're not that hungry that day. Here is an article I've read about it.
http://weightlossproblems.tumblr.com...ie-deficit-and
I have never been able to lose weight successfully at only 1200 a day. Too hungry! I have lost weight at about 1600 to 1700 a day though with working out.