Diets & Weight Maintenance Support Group
Chat about how well your latest diet is -- or is not -- working. This group is a great place to find support and accountability as well as share success stories and valuable lessons with the community. From where to start to weekly weigh-ins, get help from others to reach your dieting and weight maintenance goals.
http://www.freedieting.com/tools/calorie_calculator.htm
You can enter your specifics and look at what it says. If you are getting too few calories your body may be going into starvation mode and effectively hoarding fat.
I agree with sanka34, you may want to talk to your doctor and to a nutritionist specializing in weight loss and maintenance.