I have been working night shift (6 pm - 6 am) for approximately 6 weeks. During this time, I have experienced some weight loss (5-7 lbs) and I tend to feel fuller faster when eating (sometimes with increased burping). I eat 3 meals per day, but I suspect that my meals are smaller than when I was working day shift. I am also exercising vigorously (30 minutes running or eliptical, 4 days per week). Does this seem normal or may this be a symptom of something requiring consultation with a physician? I have no other symptoms. I am a healthy 46 year old male, 6 ft, 200 lbs.