Intersting discussion - in the last two weeks I've finally reached the "Healthy" bar on the BMI scale, which is all about weight and height, nothing to do with fat. Was toying with the idea of some Fat% scales, but have held off so far.
In the fortnight since becoming "Healthy", a number of people at work have asked me if I've lost weight, one asked if I was anorexic and someone who's noticed me losing weight over the last year told me it was time to stop, I'd lost enough.
At 6'2" and 13st 7lb, I reckon I'm pretty healthy, though all the readily available "what's the right weight for your height" type calculators reckon I've still got a way to go (again, with no knowledge of how much exercise I get).
Onto my second replacement of suits/shirts in a year, need to make some extra belt-holes...