In reply to UKC Articles:
"BMI isn't helpful either. Numerous reasons stack up as to why it is not an accurate measure of health, but the main one, and the most worrying for sports hobbyists, is that it doesn't distinguish between fat and muscle mass. Yet BMI is still regularly promoted."
It's still promoted because it does have relevance for the majority of the population, weight is weight as far as things like your joints are concerned, and the more body your heart has to push blood around the harder it has to work - pure physics. As the article hotlinked to states, yes there may be more accurate methods of measuring body health, but they're not practical for everyday usage. My skeleton and heart haven't changed since I stopped growing, yet middle-aged spread is making them work harder and wear out quicker. Change in BMI measures that easily.
Post edited at 16:53