I was diagnosed 23 years ago with an autoimmune disease that destorys my joints. I was thin and highly active at the time. I am now obese because of years of steroids and serious health issues affecting my ability to walk much less exercise. I know first hand that there are other reasons for obesity than overeating. I eat less than any of my friends or family yet am still large. Also, I fly regularly, but I always talk to the person next to me and confront the issue of my size. I keep the arm rest down for their comfort and not once in years of flying have I had someone be mean about my size once I address it. I know I am big and I try to be respectful of those around me but I also know that my size is due to matters out of my hands.