No offense, patienty, but if you think Michelle Obama is fat (or that any of our other recent presidents were “fat”), one has to question your frame of reference.
Being too thin is just as bad as being too fat. I’ve known more people who’ve suffered medical problems because of eating disorders (anorexia/bulemia related problems) than anyone who was overweight (excluding those who are morbidly obese — but that’s a category unto itself, IMHO).
Best to just be healthy, and that means different things for different people. Not a good idea to shoe-horn everyone into the same box, as we are not all designed to look the same (thank God!!!). 🙂