It's not exactly on topic, but, might be useful for you. I injured my back a week ago and since then have not worked out (aside from very light stretching/yoga). I am SHOCKED as to how little I am eating this week. I'm STUFFED after half of a standard-sandwich-size-bread turkey sandwich.
I think this just goes to show you how much you need to eat in order to work out. When I first started working out two months ago, I didn't worry about portion control as much as the QUALITY of my calories. I traded chips for nuts and veggies for example. Then naturally, as the weight started to come off, the appetite really shrunk. I've lost enough weight to not even recognize myself in mirrors or store glass windows (those are the crazy times when you freak out that someone else is wearing EXACTLY what you're wearing!) So I know that this process is working for me.
Ok, I apologize if this was a bit off topic. I'm sure the experts have the real answers, but, for me, I needed to keep my calories up while I incorporated some massive workouts.