You don't mention whether you're male or female, but 1000 calories isn't enough for either, particularly with significant exercise. You can get more calories simply by eating a little bit more of everything you're eating now, regardless of variety, so that shouldn't be an issue. Depending on your nutritional breakdown right now it could be even easier than that, as adding a few hundred calories in high-fat foods (oil, butter, avocados, nuts) is simple and takes up very little space in your belly. If instead it's carbs that have been cut a lot you can accomplish the same (for a little more volume) with a bit of starchy vegetable or grain.
I don't know if this applies to you exactly, but I think it can be really hard to figure out how to eat enough *good* food when you're not used to eating a whole lot of it in the first place (most calories before having little to no nutritional value). Add the pressure of trying to keep calories down, cut carbs -- other than fibrous vegetables -- to zilch, cut fats to zilch, and it seems all but impossible. It's not, though -- in part because all that cutting is in itself not reasonable or necessary for most people.
At a guess and assuming you're female, you could probably go slowly up to at least 1500 a day while sustaining the exact same rate of loss you have now or better. (As an example, I'm 5'8", female, 44 years old, had a vaguely comparable amount of exercise weekly, and lost 1.5 pounds per week on average on more calories than that.) You'd be healthier, and have less likelihood of your mind or body betraying you in the long run in one way or another.
Height 5'8 1/2"
5K 4/21/11: 31:55
|64 Maintenance Weeks