And how do you determine if someone is overweight or underweight? The article I posted refers to body fat percentage, which is not always obvious. For example, a "thin" person can have very little muscle mass and a high percentage of body fat. Those who like to judge others based on their looks would say that person is healthy when in fact they are not. And they might not be considered underweight either. Bottom line - let the doctors and the person themselves decide if they are healthy or not. Enough with the judgement.
The thing that concerns me is that people use "I'm healthy" as an excuse not to lose weight. Carrying excess weight is NOT good for your heart and joints over time. It simply isn't. All you have to do is look at our skyrocketing medical costs in this country AND the skyrocketing rate of obesity. The two go hand in hand. The rates of type 2 diabetes, for which being overweight is a known risk factor, is out of control . The amount we spend as a nation on this is shocking (in 2012, more than 245 BILLION...single year). We can complain all we want about the cost of medical care and medical insurance, but until we as a nation are prepared to come to grips with our weight issue, it isn't going to change.
And the same goes for being underweight (although there is less of an epidemic of that). It isn't healthy. It affects your fertility. Your heart. Your brain function.
I'm not making the judgment that any one person is "overweight" or "obese." Is the SI model fat? I can't say. I think she's beautiful. But, as a nation, you betcha I'm making that judgment. Too many of us are fat. Far too many of us.