Yes, I can totally relate to you. I think the summer heat plays a major impact the appetite(i.e. no hunger). I wouldn't worry about it too much unless you become dangerously overweight, or if this persists. I really haven't had that problem lately, but I do go through my phases. ANd yes, stress could definitely be a factor. Hang in there, I'm sure you'll be fine.
I have this problem BIG TIME. For MONTHS. In fact just the thought of eating often makes me feel sick. Does anyone have any suggestions for foods that are very nutritious but easy to eat when you don't want to eat??? This really stinks, I miss being able to enjoy food and feel hunger.
In my case there is an underlying medical disorder (not that I know what it is yet, but that's another story.) In your case it could just be weather-related or stress. But if it lasts a while I'd see a doctor. I am stuck in some kind of as-yet-undiagnosed medical nightmare but loss of appetite was my FIRST symptom (which I ignored for a long time because I thought it was stress.)