To add to the comments above, sometimes people are ill and not apparently so. My sister has a chronic illness that attacks her joints and nervous system and can't walk far. I sat next to a woman last month who looked the picture of health and arrived at the gate in a cart. She had severe rheumatoid arthritis, and was in chronic pain. When people arbitrarily attack the obese to make a point, it reflects more on their ignorance and classlessness than supports a valid argument.