Funny, most charts tell me that at my size, I'd have to starve myself continuously to maintain the weight I am at. I know I eat at least 2,000 calories a day and probably around 2,500 on days I ride or run. If it's a really hard ride, like the climbing i did last weekend, it might be 3,000 . My weight stays within 4 lbs if I exercise the way I usually do; my body fat is always around 18%. I definitely could not eat < 1,000 calories a day!
Maybe it has to do with the type of food I eat? I don't work out the way some of you guys do, but I think it would probably be rated as more than "active" than some of these calculations use.