I agree with hang it out for a while. You may get really hungry at first, or feel like your going nuts as you go through the withdrawls and your body panics. If you keep putting healthy foods into it, then it gets reassured that you have enough coming in and aren't going to start starving. When you get into ketosis, there is also some appitite suppression.

Rememebr too that there is often a slight slow down about half way through the second week or the third week. This seems to happen to everyone while your body kind of catches it's breath. After that weight loss resumes at a slightly slower, healthy rate. Don't panic and start cutting back on food then.

I also agree use www.fitday.com for a while, just until you get a really good feel for carbs, fat, and getting enough calories