Why she is mad?

After two hours yoga at yoga studio, I walked into a whole food store nearby. Grab a plate of dinner loaded with vegies, fish, and potato, I was waiting to check out. A woman suddenly approached me, stopped, and demanded in a very angry voice:" So, tell me the truth, why you are so skinny? Do you ever eat? or you eat less than 900 calories a day?". I was quite taken back by her unexpected question and her gesture. She is an mildly overweight Caucasian woman, the kind you would expect to be a smiling and mild middle age woman. But not her, her face was turning pink out of seemingly self righteous anger. It is hard to tell whether she is mad with me, herself, or maybe both? I felt obligated to ease her mind, smiling her back:"No madam, I do not starve myself, I exercise, exercising is the key, daily exercise for an hour consistently do wonders you know, try it!" She looked at me, puzzled "daily exercise one hour per day?"as if it is the first time she heard about it. As if things suddenly make sense, her face relaxed, softened, and she walked away.