You know, before I started treatment if I got depressed I wouldnt' eat and if I got really manic I wouldn't eat. I was a totally healthy weight so nobody was worried but it felt weird to me. I was hungry inside but had no appetite if that makes any sense.
Since meds unfortunitly, its turned around. If I'm depressed I eat for comfort and if I am manic I binge. That added to the fact that some meds I used to take can cause weight gain have me now 30lbs overweight (although that is 20 less than I was a year ago! I've been working on it). Talk to your doc about your eating habits. Make sure it is not going to turn into an eating disorder. Maybe your meds are causing it?