Juche, if it's only been a week, I wouldn't be concerned. If you are not hungry, don't eat. If you are worried that your appetite may never return, trust me, it will. Disinterest in food is a weird feeling, but it won't last nearly long enough. :lol:
Right now, setpoint is lower than your weight. You will lose weight until your weight reaches or falls below setpoint, and then you will get hungry. Setpoint is usually not far from weight, so you won't have long to wait before you are hungry again. Wait out the hunger, let your setpoint drop, and when it again falls below weight, AS returns. But if you eat when you are not hungry, your setpoint goes up, and weight tends to follow.