I agree that 1200 is a little low, especially considering your starting weight.
Most doctors give out a 1200 calorie plan to EVERYONE...without making changes to it to personalize it to someone's age, size, activity level, etc.
I would recommend trying 1500-1600 a day for a couple of weeks, and see how that works out. You want to aim for 1-2 pounds a week in losses. If you don't lose on 1500-1600, then adjust it down to 1400 per day. If you are losing too quickly, then adjust it up slightly instead by 100 or so per day. Everyone is different, and you have to play with it a little to find out what calorie range works best for YOU.
