Which segments of these populations have high BMI because of muscle mass instead of excess body fat? Which segments have low BMI due to childhood malnourishment

Which segments of these populations have high BMI because of muscle mass instead of excess body fat? Which segments have low BMI due to childhood malnourishment or current or chronic illness? These are just some of the very obvious questions that have already been used to relegate your conveniently concise "fact" to "interesting, but not instructive".