Personally, I think calories matter. However, I wouldn't count anything but your carbs to start with. I'd recommend you eat whatever amount it takes to satisfy your hunger during induction, but not a bite more. You may eat quite a bit at first, while getting over your feelings of deprivation-but those feelings pass, after a while you may need to remind yourself to eat-and then make sure you aren't dropping too low. Make sure your meals are LC and high fat, moderate protein and don't worry about it!