PTSD seems to be good weight control for me as well and helps me to stay in shape. It's not that I don't eat, it's just that I get hyper when I'm stressed and then I can't stop moving so I walk, lift weights, ride my bycicle, and run laps on my stairwell. I've had people accuse me of being anorexic when in reality I eat like a pig to maintain a healthy body weight so I won't lose strength. Then when my stress level goes down and I exercise less I've got to ratchet down my eating habits. It's not easy to manage or stay in the same size clothes.