If it lasts for much longer, I'd make an appointment with your Doctor, but it "could" be just the new found motivation you have to lose weight. I mean, look at you, you are doing super well, losing weight & eating better...It feels great doesn't it? I went through several periods like this where I just felt SOOOO good that I did not have the desire to eat. Like being high on life instead of sugar...

If this IS the case, enjoy the ride, because if you are anything like me, it won't be long until you are back recalculating everything over and over so that you can get in every last one of your calories for the day!