Illustrated BMI

I thought this was interesting. It has photographs of women with their weight and body mass index. Some comments:

• I believe the purpose of this (or the purpose of links to this) was to show that "normal" is thin, "overweight" is normal, etc. Might also be a sign that America is becoming accustomed to seeing people of unhealthy weights. (When I go to foreign places--like France and LA--I am always shocked to realize that I am not nearly as thin as I thought I was...)
  
• How is BMI being measured here? If you did a ratio of weight/height or something like that, that's not good enough because you don't factor in muscle mass. Not stating how BMI is measured makes pictures like "____ is 'overweight'--and a triathlete" less convincing...