I disagree. Using BMI to gauge the obesity of an individual is lazy, but for a population, its quite okay. How many people are more than 6'5" in a population?

I disagree. Using BMI to gauge the obesity of an individual is lazy, but for a population, its quite okay. How many people are more than 6'5" in a population? How many athletes? And even athletes sometime are overweight! A 6'5", 29 BMI NFL LB might be healthy, but the 32 BMI lineman with the same size will have the same problem as obese people once he's 35, discounting injuries.