You can rationlize what you're talking about, but what you have said, several times now, is that overweight is (without qualification) unhealthy. And that is false. As you have just demonstrated, it is indeed hard to determine where the threshold is. Several times now you have made a 1:1 correlation between being overweight and being unhealthy. Yet you don't define the parameters. Any amount greater than the mean is enough in your books to correlate to poor health. (You've had several chances to qualify your generalization and have chosen instead to reiterate it.) Increasingly, you will find, doctors are saying the BMI is long out-dated, was never a good measure in the first place, and that having a higher weight than average is not in-and-of-itself unhealthy - that that there are far better indicators of health than weight (such as blood pressure). Remember where this started: you felt that someone who was overweight (without defining it further) had no business speaking out about bullying until and unless they 'fix' their 'poor health' - as diagnosed by you. Don't do that.