It sounds like maybe you aren't eating enough calories. I have read in magazines, online, books, heard on tv, you name it, that you should NEVER go below 1200 calories a day without the strict supervision of a physician. This puts your body in starvation mode and makes it more difficult for you to lose weight because your body is trying to conserve the weight rather than let it go. For those of us who are very overweight, even 1200 a day may be too low (since our bodies are larger and require more caloreis simply to function even if you are not very active). I was eating 1800-2000 calories a day and not exercising regularly and was still losing weight because it all comes down to calories in vs. calories out, but WITHOUT depriving your body of the essential amount of calories it needs to function. I know, it doesn't really follow common sense (if I eat less, I should weigh less, right?), but it is true and has been proven time and time again, not only by experts, but by real people on these boards who gained or maintained weight at 1200 calories then lost weight when they upped it to, say, 1500-1600 calories a day.
If you think you ARE getting enough caloris, then maybe all you need to do is shake it up a bit. Your body gets used to eating the same things every day and settles into a pattern of satisfaction that does not include weight loss. Try varying your diet a little more or having 3 high-calorie days and 4 low-calorie days a week (to average out to your desired number of calories per day). Often, this will wake your body up and keep it on its toes instead of being contently settled into a pattern, therefore jump starting the weight loss again.
I agree with MrsJim that you may want to eat more frequently, also. Eating every 3-4 hours throughout the day is much better for your metabolism, for it's not so stop-and-go, it's a consistent pattern of working and burning and processing.
I know it's hard to hear "eat more" or "eat more often" when you're dieting because it just doesn't seem to make sense to our minds, but it does to our bodies, and after all, that's what you're after is a better body



