This is the dumbest thing I have heard in some time!! People, as you know, come in all shapes and sizes. I happen to be 6'4", and according to some charts, my 230 lb body weight makes me "obese". Really?!! At the recommended weight of 185 lbs, I would be practically a human skeleton, with little strength or energy to perform daily tasks..
First of all, we need to drop the term obesity- it's shock value is long lost due to overuse. Yes, many people are overweight; not so many are actually obese. Obesity is a severe, imminently life threatening condition. Second, we need to stop trying to coerce, bribe, or threaten those whose physical conditions or lifestyles do not meet favorably with our expectations.