The magazine "Cosmo" had a couple of covers that showed over-weight (obese) women. The covers also had the print "This is healthy".
While the heavy set models had attractive smiles and were both youthful, if obese is healthy, why were the models posing in gym gear?
You can still technically be in good health for a time while obese, but it usually catches up to them eventually in one way or another. Exercise does not always result in weight loss but can still help with your health overall. I know it's more about showing all body types so people feel more comfortable in their own skin than actually showcasing healthy people. We can't tell someone is healthy just by looking at them either way.