I maintain my weight (130lbs) in about 2,000cal a day, mostly due to constant exercise. However, if I feel like taking a couple off for a bike race or whatever, I can dip down to 1,200 for a couple weeks, and not even get any hungrier. If anything, I usually feel even more energetic. But, yeah, cutting yourself off at 2k in order to lose weight says a whole lot about the amount of calories you take in on a regular basis.